22 files changed, 764 insertions, 0 deletions

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..3cb43a1
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "fiz/naloga/vodnaraketa/esp8266FTPServer"]
+	path = fiz/naloga/vodnaraketa/esp8266FTPServer
+	url = https://github.com/nailbuster/esp8266FTPServer
diff --git a/ang/exam/2/dokument.md b/ang/exam/2/dokument.md
new file mode 100644
index 0000000..5cc0d04
--- /dev/null
+++ b/ang/exam/2/dokument.md
@@ -0,0 +1,124 @@
+## infinitive, gerund
+
+the -ing form is used after prepositions and: detest, dislike, enjoy, hate, like, love, prefer, resent
+
+# words
+
+## megacities
+
+* sustainable infrastructure
+* sprawling, increasing, expanding
+* urban / metropolitan area
+* accomodating
+* enchancing / improving
+* degradation
+* multilingual / diverse
+* density
+* undergo
+* urban sprawl
+* successive waves of immigrants, an excessive influx of immigrants
+* allure
+* emulate / immitate
+* veneer / to develop veneer
+* assorted / diverse cultures
+* racial tensions, prejudices against
+* inadequate infrastructure
+* exclusive / inclusive
+* to be biased
+* alienation = odtujitev
+
+## advertising
+
+* to skew / distort
+* gender discrimination
+* racist connotation
+* perpetrated / perpatuated / stereotyped / portrayed
+* submissive
+* misogynistic
+* misleading
+* implicit
+* catchy jingles
+* subtle
+* blatant
+* ubiquitous
+* watchdog
+* exploit
+* deceptive misleading / false advertisement
+* to endorse a product / to recommend it
+* product endorsement
+* to disclaim / say you have no responsibility
+
+## consumerism
+
+* irresistible bargains
+* an insatiable desire
+* compulsive shopping
+* resist temptation
+* to be tempted into
+* parlance / jargon
+* avalanche
+* parmy / crazy
+* mock-up / replica
+* meandered / wandered
+* critical faculties / ability to judge objectively
+* oasis / refuge
+* blithely / in a carefree manner
+* coughing up / spending
+* banal repetitious and dull
+* proceeds / profits
+* glorified / seeming more important than in reality is
+* gratifying
+
+# phrasal verbs
+
+## take
+
+* to take after = to resemble
+* to take back = apologise
+* to take somebody for = identify wrongly
+* to take in = fully understand
+* to take off = remove / leave the ground / imitating
+* take over = gain control of
+* take to somebody = like immediately
+* take up = start
+* taken aback = strongly surprised
+* taken in = be deceived
+
+## set
+
+* set about = began
+* set aside = save
+* set back = hindered = ovirati
+* set in (weather) = started to continue
+* set off/out = started a journey
+* to set on = to cause to attack
+* set up = started
+
+## stand
+
+* stand by = support
+* stand for = represents
+* stand in = replace temporarily
+* stand out = be noticable
+* stand up = support
+
+## turn
+
+* turn down = refused admittance / refuse an offer
+* turn in = give to the police
+* turn off = switch off
+* turn out = proved to be
+* turn up = appear
+
+
+## wear
+
+* worn away = reduced gradually
+* wear off = stop
+* worn out = exhausted
+
+## work
+
+* work on = what effect it has on
+* work out = find a solution
+* worked up = developed
diff --git a/fiz/naloga/vodnaraketa/.gitignore b/fiz/naloga/vodnaraketa/.gitignore
new file mode 100644
index 0000000..03f4a3c
--- /dev/null
+++ b/fiz/naloga/vodnaraketa/.gitignore
@@ -0,0 +1 @@
+.pio
diff --git a/fiz/naloga/vodnaraketa/Makefile b/fiz/naloga/vodnaraketa/Makefile
new file mode 100644
index 0000000..921476a
--- /dev/null
+++ b/fiz/naloga/vodnaraketa/Makefile
@@ -0,0 +1,23 @@
+default:
+	@echo "*** vodna raketa *** 🚀"
+	@echo "recepti:"
+	@echo "	- p: naloži knjižnice"
+	@echo "	- c: prevede v strojno kodo"
+	@echo "	- u: nalozi na mikrokontroler"
+	@echo "	- n: pobriše generirane direktorije in datoteke iz tega direktorija"
+	@echo "imeti morate python3-pip"
+	@echo "to je vse, hvala"
+
+c:
+	pio run
+
+u:
+	pio run --target uploadfs
+	pio run --target upload
+
+p:
+	pip install -U platformio
+	pio run
+
+n:
+	pio run --target clean
diff --git a/fiz/naloga/vodnaraketa/README.txt b/fiz/naloga/vodnaraketa/README.txt
new file mode 100644
index 0000000..1927334
--- /dev/null
+++ b/fiz/naloga/vodnaraketa/README.txt
@@ -0,0 +1,5 @@
+*** vodna raketa *** 🚀
+
+programje za mojo projektno nalogo pri fiziki v drugem letniku
+
+več informacij v predstavitvi sami, ki jo, če je že narejena, najdete v repozitoriju sijanec/sola-gimb-2
diff --git a/fiz/naloga/vodnaraketa/data/index.html b/fiz/naloga/vodnaraketa/data/index.html
new file mode 100644
index 0000000..2e4fd3c
--- /dev/null
+++ b/fiz/naloga/vodnaraketa/data/index.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html lang=sl>
+	<head>
+		<meta charset=UTF-8 />
+		<title>
+			spletni vmesnik vodne rakete
+		</title>
+		<link rel=stylesheet href=//sijanec.eu/assets/css/styles.css />
+	</head>
+	<body>
+		<h1>
+			spletni vmesnik računalnika projetne naloge pri fiziki v drugem letniku
+		</h1>
+		<hr>
+		<p>
+		&copy; Anton Luka Šijanec 2021 - <a href=//git.sijanec.eu/sijanec/sola-gimb-2/src/branch/master/fiz/naloga/vodnaraketa>vodnaraketa</a>
+		</p>
+	</body>
+</html>
diff --git a/fiz/naloga/vodnaraketa/data/settings.json b/fiz/naloga/vodnaraketa/data/settings.json
new file mode 100644
index 0000000..4ef4b59
--- /dev/null
+++ b/fiz/naloga/vodnaraketa/data/settings.json
@@ -0,0 +1,40 @@
+{
+	/* wifi access point configuration */
+	"ap_ssid": "vodnaraketa",
+	"ap_pass": "",
+	"ap_ch": 1,
+	"ap_hidden": 0,
+	"ap_ip": "10.82.66.1",
+	"ap_gw": "10.82.66.1",
+	"ap_nm": "255.255.255.0",
+	"ap_dns1": "",
+	"ap_dns2": "",
+	"ap_host": "vodnaraketa",
+
+	/* wifi station (client) configuration, leave ip settings empty to use DHCP obtained */
+	"sta_ssid": "",
+	"sta_pass": "",
+	"sta_ip": "",
+	"sta_dns": "",
+	"sta_gw": "",
+	"sta_nm": "",
+	"sta_dns1": "",
+	"sta_dns2": "",
+	"sta_host": "vodnaraketa",
+	"sta_static": 0,
+
+	/* pin configuration */
+	"scale_dout": "D6",
+	"scale_sck": "D5",
+
+	/* username and password for FTP and HTTP authentication */
+	"ftp_user": "vodnaraketa",
+	"ftp_pass": "",
+	"http_user": "",
+	"http_pass": "",
+
+	/* general info */
+	"host": "vodnaraketa",
+	
+	"json parser": "don't be angry"
+}
diff --git a/fiz/naloga/vodnaraketa/include/README b/fiz/naloga/vodnaraketa/include/README
new file mode 100644
index 0000000..194dcd4
--- /dev/null
+++ b/fiz/naloga/vodnaraketa/include/README
@@ -0,0 +1,39 @@
+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html
diff --git a/fiz/naloga/vodnaraketa/lib/README b/fiz/naloga/vodnaraketa/lib/README
new file mode 100644
index 0000000..6debab1
--- /dev/null
+++ b/fiz/naloga/vodnaraketa/lib/README
@@ -0,0 +1,46 @@
+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html
diff --git a/fiz/naloga/vodnaraketa/platformio.ini b/fiz/naloga/vodnaraketa/platformio.ini
new file mode 100644
index 0000000..5977f35
--- /dev/null
+++ b/fiz/naloga/vodnaraketa/platformio.ini
@@ -0,0 +1,25 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+[env:myboard]
+platform = espressif8266
+board = nodemcuv2
+monitor_speed = 9600
+upload_speed = 921600
+build_flags = -DDEBUG_ESP_CORE -DDEBUG_ESP_WIFI -DDEBUG_ESP_PORT=Serial -DIP_FORWARD=1
+framework = arduino
+board_build.filesystem = littlefs
+board_build.ldscript = eagle.flash.4m2m.ld
+src_filter = -<*> +<main.cpp>
+lib_deps =
+	Time
+	https://github.com/dplasa/FTPClientServer
+	bogde/HX711
+	DNSServer
+	ESP Async WebServer
diff --git a/fiz/naloga/vodnaraketa/src/func.c b/fiz/naloga/vodnaraketa/src/func.c
new file mode 100644
index 0000000..07bfd6e
--- /dev/null
+++ b/fiz/naloga/vodnaraketa/src/func.c
@@ -0,0 +1,31 @@
+const int str2pin_map[] = {
+	D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	A0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+int str2pin(const char * s) {
+	if (s[0] >= '0' && s[0] <= '9')
+		return atoi(s);
+	return str2pin_map[atoi(s+1) + ((s[0]=='A') ? 20 : 0)];
+}
+
+/* reads settings into json object */
+void load_settings () {
+	if (LittleFS.exists("settings.json")) {
+		File s = LittleFS.open("settings.json", "r");
+		if (s)
+			deserializeJson(settings, s);
+		s.close();
+	}
+}
+
+/* stores settings from json object to file */
+void store_settings () {
+	File s = LittleFS.open("settings.json", "w");
+	serializeJson(settings, s);
+	s.close();
+}
+
+void notFound(AsyncWebServerRequest *request) {
+	request->send(404, "text/plain", "404");
+}
diff --git a/fiz/naloga/vodnaraketa/src/main.cpp b/fiz/naloga/vodnaraketa/src/main.cpp
new file mode 100644
index 0000000..91280dd
--- /dev/null
+++ b/fiz/naloga/vodnaraketa/src/main.cpp
@@ -0,0 +1,171 @@
+#define ARDUINOJSON_ENABLE_COMMENTS 1
+#include <stdlib.h>
+#include <Arduino.h>
+#include <ArduinoJson.h>
+#include "LittleFS.h"
+#include <DNSServer.h>
+#include <ESP8266WiFi.h>
+#include <WiFiClient.h>
+#include <TimeLib.h>
+#include <WiFiUdp.h>
+#include <ESP8266httpUpdate.h>
+#include <ESPAsyncWebServer.h>
+#include <HX711.h>
+#include <FTPServer.h>
+
+DynamicJsonDocument settings(2048);
+
+#include <func.c>
+
+FTPServer ftpServer(LittleFS);
+DNSServer dnsServer;
+AsyncWebServer httpServer(80);
+HX711 scale;
+
+time_t measure = 0;
+File measureFile;
+
+void reload (bool w = 0) {
+	/* stop services unless they were never started, indicate this by w in for example setup() */
+	if (!w) {
+		ftpServer.stop();
+		httpServer.reset();
+		dnsServer.stop();
+	}
+
+	/* reload settings */
+	load_settings();
+
+	/* bring up AP networking */
+	IPAddress ap_ip(10, 82, 66, 1);
+	ap_ip.fromString(settings["ap_ip"].as<String>());
+	IPAddress ap_gateway(10, 82, 66, 1);
+	ap_gateway.fromString(settings["ap_gw"].as<String>());
+	IPAddress ap_subnet(255, 255, 255, 0);
+	ap_subnet.fromString(settings["ap_nm"].as<String>());
+	WiFi.mode(WIFI_AP);
+	WiFi.softAPConfig(ap_ip, ap_gateway, ap_subnet);
+	const char * ap_pass = settings["ap_pass"].as<String>().c_str();
+	if (ap_pass && strlen(ap_pass) < 8)
+		ap_pass = NULL;
+	WiFi.softAP(settings["ap_ssid"].as<String>().c_str(), ap_pass, settings["cp_ch"].as<int>(), settings["ap_hidden"].as<int>());
+	Serial.println("WiFi.softAPIP() = " + WiFi.softAPIP().toString());
+
+
+	/* bring up STA networking - if that's desired */
+	const char * sta_ssid = settings["sta_ssid"].as<String>().c_str();
+	if (sta_ssid && strlen(sta_ssid) > 0) {
+		IPAddress sta_ip(10, 69, 69, 82);
+		sta_ip.fromString(settings["sta_ip"].as<String>());
+		IPAddress sta_gw(10, 69, 69, 1);
+		sta_ip.fromString(settings["sta_gw"].as<String>());
+		IPAddress sta_nm(255, 255, 255, 0);
+		sta_ip.fromString(settings["sta_nm"].as<String>());
+		IPAddress sta_dns1(93, 103, 235, 126);
+		sta_dns1.fromString(settings["sta_dns1"].as<String>());
+		IPAddress sta_dns2(193, 2, 1, 66);
+		sta_dns2.fromString(settings["sta_dns2"].as<String>());
+		WiFi.disconnect(true);
+		WiFi.hostname(settings["sta_host"].as<String>());
+		const char * sta_pass = settings["sta_pass"].as<String>().c_str();
+		if (strlen(sta_pass) < 8)
+			sta_pass = NULL;
+		WiFi.begin(sta_ssid, sta_pass);
+		if (settings["sta_static"].as<int>())
+			if (!WiFi.config(sta_ip, sta_gw, sta_nm, sta_dns1, sta_dns2))
+				Serial.println("failed to wifi config");
+	}
+
+	/* start services */
+	dnsServer.start(53, settings["host"], WiFi.softAPIP());
+	ftpServer.begin(settings["ftp_user"], settings["ftp_pass"]);
+	/* web server */
+#define ADD_AUTH(h) if (strlen(settings["http_user"].as<String>().c_str()) || strlen(settings["http_pass"].as<String>().c_str())) h.setAuthentication(settings["http_user"], settings["http_pass"])
+	auto h = httpServer.serveStatic("/", LittleFS, "/")
+		.setDefaultFile("index.html")
+		.setAuthentication(settings["http_user"], settings["http_pass"]);
+	ADD_AUTH(h);
+	h = httpServer.on("/rst", [](AsyncWebServerRequest * r) {
+		r->send(201, "text/plain", "OK");
+		ESP.restart();
+	});
+	ADD_AUTH(h);
+	h = httpServer.on("/rld", [](AsyncWebServerRequest * r) {
+		r->send(201, "text/plain", "OK");
+		reload();
+	});
+	h = httpServer.on("/m", [](AsyncWebServerRequest * r) {
+		if (!r->hasParam("n"))
+			r->send(400, "text/plain", "Manjka parameter n - število sekund meritve");
+		else
+			if (!measure) {
+				measure = time(NULL)+atoi(r->getParam("n")->value().c_str());
+				r->send(201, "text/plain", "OK");
+			} else {
+				r->send(400, "text/plain", "Meritev že poteka!");
+			}
+	});
+	ADD_AUTH(h);
+
+	/* specifični ukazi za meritve: začetek loadcella, kalibracija, tara */
+	scale.begin(str2pin(settings["scale_dout"].as<String>().c_str()), str2pin(settings["scale_sck"].as<String>().c_str()));
+	h = httpServer.on("/c", [](AsyncWebServerRequest * r) {
+		if (!r->hasParam("t")) {
+			r->send(400, "text/plain", "Manjka parameter t - teža na tehtnici");
+		}
+		if (scale.wait_ready_timeout(1000)) {
+			scale.set_scale();
+			scale.tare();
+			scale.set_scale(scale.get_units(10)/atof(r->getParam("t")->value().c_str()));
+			r->send(200, "text/plain", "OK");
+		} else {
+			r->send(500, "text/plain", "Tehtnica ni najdena");
+		}
+	});
+	ADD_AUTH(h);
+	h = httpServer.on("/t", [](AsyncWebServerRequest * r) {
+		if (scale.wait_ready_timeout(1000)) {
+			scale.tare();
+			r->send(400, "text/plain", "OK");
+		} else {
+			r->send(500, "text/plain", "Tehtnica ni najdena.");
+		}
+	});
+	ADD_AUTH(h);
+}
+
+void handleMeasure() {
+	if (measure != 0) {
+		if (measure < time(NULL)) {
+			if (measureFile.isFile()) {
+				char filename[32];
+				snprintf(filename, 32, "meritev%ldl.csv", time(NULL));
+				measureFile = LittleFS.open(filename, "w");
+				scale.power_up();
+			}
+			if (scale.wait_ready_timeout(1000)) {
+				long reading = scale.get_units(10);
+				measureFile.print(millis()+""+"\n");
+			} else {
+				Serial.println("HX711 ni najden.");
+			}
+		} else {
+			measure = 0;
+			measureFile.close();
+			scale.power_down();
+		}
+	}
+}
+
+void setup () {
+	Serial.begin(9600);
+	Serial.println("Živ sem!");
+	LittleFS.begin();
+	reload(1);
+}
+
+void loop () {
+	handleMeasure();
+	ftpServer.handleFTP();
+	dnsServer.processNextRequest();
+}
diff --git a/fiz/naloga/vodnaraketa/test/README b/fiz/naloga/vodnaraketa/test/README
new file mode 100644
index 0000000..b94d089
--- /dev/null
+++ b/fiz/naloga/vodnaraketa/test/README
@@ -0,0 +1,11 @@
+
+This directory is intended for PlatformIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html
diff --git a/inf/rtk/2021-izbirno/1/a.out b/inf/rtk/2021-izbirno/1/a.out
new file mode 100755
index 0000000..354664c
--- /dev/null
+++ b/inf/rtk/2021-izbirno/1/a.out
diff --git a/inf/rtk/2021-izbirno/1/prog.c b/inf/rtk/2021-izbirno/1/prog.c
new file mode 100644
index 0000000..aa3e62d
--- /dev/null
+++ b/inf/rtk/2021-izbirno/1/prog.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.h>
+int main (int argc, char ** argv) {
+	char * buf = malloc(500);
+	fgets(buf, 500, stdin);
+	char * cp;
+	int n = strtoll(buf, &cp, 10);
+	cp++;
+	int k = strtoll(cp, NULL, 10);
+	int * a = calloc(n+1, sizeof(int));
+	int * t = calloc(n+1, sizeof(int)); /* t[x] = ekipa št <od 1 do k> */
+	realloc(buf, (n+1)*6);
+	fgets(buf, (n+1)*6, stdin);
+	cp = buf;
+	int i = 0; /* i bo število zadnjega in hkrati število vseh, kajti prvi je 1 */
+	do {
+		int ai = strtoll(cp, &cp, 10);
+		if (ai != 0)
+			a[++i] = ai;
+		cp++;
+	} while (cp[-1] != 0 && cp[-1] != '\n' && cp[-1] != '\r');
+	if (i != n)
+		fprintf(stderr, "error %d ni %d\n", n, i);
+	int ze = 0; /* referencaj novo ekipo po (++ze % k)+1 */
+k1:
+	for (int j = 1; j <= n; j++) {
+		if (!t[(i = j)])
+			goto k2;
+	}
+	goto konec;
+k2:
+	/*
+	e = 0;
+	while (!t[zn]) {
+		if (!e++)
+			fprintf(stdout, "%d ", zn);
+		if (t[a[zn]]) { // če je naš a že v ekipi, i damo v to ekipo
+			t[zn] = t[a[zn]];
+			zn++;
+		}
+		t[zn] = (ze % k)+1;
+		zn = a[zn];
+	}
+	ze++;
+	*/
+	if (ze)
+		fprintf(stdout, " ");
+	fprintf(stdout, "%d", i);
+	t[i] = ++ze;
+k3:
+	if (t[a[i]])
+		goto k1;
+k4:
+	i = a[i];
+k5:
+	t[i] = ze;
+	goto k3;
+konec:
+	fprintf(stdout, "\n");
+	free(buf);
+	return 0;
+}
diff --git a/inf/rtk/2021-izbirno/2/a.out b/inf/rtk/2021-izbirno/2/a.out
new file mode 100755
index 0000000..d23cc33
--- /dev/null
+++ b/inf/rtk/2021-izbirno/2/a.out
diff --git a/inf/rtk/2021-izbirno/2/in.txt b/inf/rtk/2021-izbirno/2/in.txt
new file mode 100644
index 0000000..666efb4
--- /dev/null
+++ b/inf/rtk/2021-izbirno/2/in.txt
@@ -0,0 +1,2 @@
+10 1
+6 0 91 14 73 91 67 63 9 69
diff --git a/inf/rtk/2021-izbirno/2/prog.c b/inf/rtk/2021-izbirno/2/prog.c
new file mode 100644
index 0000000..eda85e9
--- /dev/null
+++ b/inf/rtk/2021-izbirno/2/prog.c
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <limits.h>
+int primerjaj_cela (const void * a, const void * b) {
+	const int * c = (const int *) a;
+	const int * d = (const int *) b;
+	return *d - *c; /* najv proti najm */
+}
+int main (int argc, char ** argv) {
+	char * buf = malloc(500);
+	fgets(buf, 500, stdin);
+	char * cp;
+	int N = strtoll(buf, &cp, 10);
+	cp++;
+	int M = strtoll(cp, NULL, 10);
+	int * x = calloc(N+1, sizeof(int));
+	int * g = malloc((M+1)*sizeof(int));
+	int * gl = malloc((M+1)*sizeof(int));
+	for (int o = 0; o < M; o++)
+		g[o] = INT_MAX;
+	realloc(buf, (N+1)*6*9);
+	fgets(buf, (N+1)*6*9, stdin);
+	cp = buf;
+	int i = 0;
+	int mx = 0;
+	do {
+		int xi = strtoll(cp, &cp, 10);
+		// if (xi != 0)
+		x[++i] = xi;
+		if (xi > mx)
+			mx = xi;
+		cp++;
+	} while (cp[-1] != 0 && cp[-1] != '\n' && cp[-1] != '\r');
+	free(buf);
+	if (N != i) {
+		fprintf(stderr, "error %d ni %d\n", N, i);
+		for (int o = 1; o <= i; o++)
+			fprintf(stderr, "  %d\n", x[o]);
+	}
+	fprintf(stderr, "max = %d\n", mx);
+	for (i = 0; i <= mx; i++) {
+		int s = 0;
+		for (int j = 1; j <= N; j++)
+			s += abs(i-x[j]);
+		int mo = 0;
+		int me = 0;
+		for (int o = 0; o < M; o++) {
+			if (g[o] > mo) {
+				mo = g[o];
+				me = o;
+			}
+		}
+		if (mo > s)
+			g[me] = s;
+	}
+	int s = 0;
+	for (int o = 0; o < M; o++) {
+		fprintf(stderr, "GOSTILNA %d ima seštevek %d\n", o, g[o]);
+		s += g[o];
+	}
+	fprintf(stdout, "%d\n", s);
+	return 0;
+}
diff --git a/inf/rtk/2021-izbirno/3/a.out b/inf/rtk/2021-izbirno/3/a.out
new file mode 100755
index 0000000..d7053de
--- /dev/null
+++ b/inf/rtk/2021-izbirno/3/a.out
diff --git a/inf/rtk/2021-izbirno/3/in.txt b/inf/rtk/2021-izbirno/3/in.txt
new file mode 100644
index 0000000..d8d19ab
--- /dev/null
+++ b/inf/rtk/2021-izbirno/3/in.txt
@@ -0,0 +1,7 @@
+5 4
+1 1 3 3
+5 4 1 2 1
+1 1 8
+2 1 10
+1 1 8
+1 3 0
diff --git a/inf/rtk/2021-izbirno/3/prog.c b/inf/rtk/2021-izbirno/3/prog.c
new file mode 100644
index 0000000..0686c60
--- /dev/null
+++ b/inf/rtk/2021-izbirno/3/prog.c
@@ -0,0 +1,86 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <limits.h>
+int main (int argc, char ** argv) {
+	char * buf = (char *) malloc(500);
+	fgets(buf, 500, stdin);
+	char * cp;
+	int n = strtoll(buf, &cp, 10);
+	cp++;
+	int q = strtoll(cp, NULL, 10);
+	int * r = (int *) calloc(n+1, sizeof(int));
+	int * x = (int *) calloc(n+1, sizeof(int));
+	realloc(buf, (n+1)*6*9);
+	fgets(buf, (n+1)*6*9, stdin);
+	cp = buf;
+	int i = 1; /* začnemo z delavcem 2, ker 1 nima starša */
+	do {
+		int xi = strtoll(cp, &cp, 10);
+		if (xi != 0)
+			r[++i] = xi;
+		cp++;
+	} while (cp[-1] != 0 && cp[-1] != '\n' && cp[-1] != '\r');
+	i = 0; /* začnemo z delavcem 1 */
+	fgets(buf, (n+1)*6*9, stdin);
+	cp = buf;
+	do {
+		int xi = strtoll(cp, &cp, 10);
+		if (xi != 0)
+			x[++i] = xi;
+		cp++;
+	} while (cp[-1] != 0 && cp[-1] != '\n' && cp[-1] != '\r');
+	if (n != i)
+		fprintf(stderr, "error %d ni %d\n", n, i);
+	else
+		fprintf(stderr, "st\n");
+	fgets(buf, 1000, stdin);
+	while (!feof(stdin)) {
+		cp = buf;
+		if (cp[0] == '1') { /* GET */
+			cp += 2;
+			int d = strtol(cp, &cp, 10);
+			cp++;
+			int t = strtol(cp, NULL, 10);
+			int o = INT_MAX;
+			for (int i = 1; i <= n; i++) {
+				int p = i;
+				int y = 0;
+				while (1) {
+					if (p == d) {
+						y++;
+						break;
+					}
+					if (p == 1)
+						break;
+					p = r[p];
+				}
+				if (!y)
+					continue;
+				else
+					fprintf(stderr, "GET V HIER: %d\n", i);
+				if (x[i] > t && x[i] < o) {
+					fprintf(stderr, "  x[i] == %d\n", x[i]);
+					o = x[i];
+				}
+			}
+			if (o == INT_MAX)
+				o = -1;
+			fprintf(stdout, "%d\n", o);
+		} else { /* POST */
+			cp += 2;
+			int d = strtol(cp, &cp, 10);
+			cp++;
+			int t = strtol(cp, NULL, 10);
+			x[d] = t;
+			fprintf(stderr, "POST OK: { ");
+			for (int i = 1; i <= n; i++) {
+				fprintf(stderr, "%d:%d, ", i, x[i]);
+			}
+			fprintf(stderr, "}\n");
+		}
+		fgets(buf, 1000, stdin);
+	}
+	free(buf);
+	return 0;
+}
diff --git a/inf/rtk/2021-izbirno/p/p.c b/inf/rtk/2021-izbirno/p/p.c
new file mode 100644
index 0000000..7f02924
--- /dev/null
+++ b/inf/rtk/2021-izbirno/p/p.c
@@ -0,0 +1,5 @@
+#include <stdio.h>
+#include <stdlib.h>
+int main (int argc, char ** argv) {
+	return 0;
+}