Compilare: main.cpp: In function 'int main()': main.cpp:48:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (v[w].size () * w > g) ~~~~~~~~~~~~~~~~~^~~ main.cpp:28:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("rucsac.in", "r", stdin); ^ main.cpp:30:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("rucsac.out", "w", stdout); ^ main.cpp:32:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &n, &g); ^ main.cpp:38:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &w, &p); ^