[TEMA] Problema UBB info

#include <iostream>
#include <fstream>
using namespace std;
ifstream f ("a.in");
int sir[500], lungime_sir = 0;
void citire_matrice (int a[][50], int &n){
int i, j;
f >> n;
for (i = 1; i <= n; i++)
	 for (j = 1; j <= n; j++)
		 f >> a[i][j];
f.close();
}
int prim (int x){
if (x < 3) return 1;
int i;
for (i = 2; i <= x/2; i++)
	 if (x % i == 0)
		 return 0;
return 1;
}
int super_prim(int x){
while (x){
	 if (prim(x) == 0) return 0;
	 x/=10;
}
return 1;
}
int inserare_sir_desc( int x){
lungime_sir++;
int i = lungime_sir;
while (x > sir[i-1] && i >= 0){
		 sir[i] = sir[i-1];
		 i--;
}
sir[i] = x;

}
void construire_sir (int a[][50], int n){ // n = nr el linie / coloana
int i, j, k, exista_deja = 0;
for (i = 2; i < n; i++){
	 for (j = 1; j <= n; j++){
		 if ( ( (i >= j+1 && i < n-j+1 && j < n/2 ) || (j > n/2 && i >= -j+n+2 && i <= j-1) ) && super_prim(a[i][j]) ) {
			 for (k = 0; k < lungime_sir; k++)
				 if (sir[k] == a[i][j]) exista_deja = 1;
			 if(exista_deja == 0){
				 //cout << a[i][j] << " ";
				 inserare_sir_desc ( a[i][j]);		 exista_deja = 0;
			 }
		 }
	 }
}
}
int main()
{
int a[50][50], n;
citire_matrice (a, n);
construire_sir(a, n);
cout << "\n"; if (lungime_sir == 0) cout << "Sir vid"; else
for (int i = 0; i < lungime_sir; i++) cout << sir[i] << " ";
return 0;
}