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#include <stdio.h>
#include <stdlib.h>
int main (int argc, char ** argv) {
if (argc != 1+1) {
fprintf(stderr, "uporaba: %s <stevilka>\nprimer za mrežo 20x20: %s 20\n", argv[0], argv[0]);
return 1;
}
unsigned long int n = strtol(argv[1], NULL, 10);
unsigned long int s = 0; // Seštevek
unsigned long int i = 0; // Index iteracije
unsigned long int x = 0; // X
for (i = 0; i <= n-1; i++) {
// najprej diagonale
fprintf(stderr, "%lu\n", i);
s = s + (n-(i))+(n-(i));
}
for (i = 1; i <= n; i++) {
for (x = 0; x <= i-1; x++) {
s = s + 2*( (n-i)+(n-(x+1)) );
}
}
fprintf(stdout, "rezultat je: %lu\n", s);
return 0;
}
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