Compilare: user.cpp: In function ‘int main()’: user.cpp:97:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j<A.size() && A[j].l2<i) ^ user.cpp:106:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j<A.size() && A[j].c2<i) ^ user.cpp:47:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arhipelag2.in", "r", stdin); ^ user.cpp:48:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arhipelag2.out", "w", stdout); ^ user.cpp:49:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &M); ^ user.cpp:52:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i][j]); ^