Compilare: main.cpp: In function 'int main()': main.cpp:58:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("matrice.in", "r", stdin); ^ main.cpp:59:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("matrice.out", "w", stdout); ^ main.cpp: In function 'void solve(int, int)': main.cpp:52:20: warning: 'nr' may be used uninitialized in this function [-Wmaybe-uninitialized] cnt += nr; ^~ main.cpp:51:9: warning: 'best' may be used uninitialized in this function [-Wmaybe-uninitialized] if (ans == best) ^~