Compilare: user.cpp: In function ‘int main()’: user.cpp:27:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=1; j<v[i].size (); j++) ^ user.cpp:36:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int p=1; p * i <= j && p <= v[i].size (); p++) ^ user.cpp:14:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ruksak.in", "r", stdin); ^ user.cpp:15:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ruksak.out", "w", stdout); ^ user.cpp:17:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &G); ^ user.cpp:21:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &w, &p); ^