Compilare: user.cpp: In function ‘void solve()’: user.cpp:56:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < work.size(); i++) { ^ user.cpp:60:58: warning: operation on ‘dim’ may be undefined [-Wsequence-point] S[++dim] = mp( work[ S[dim].second ].intr(e), i ); ^ user.cpp: In function ‘int main()’: user.cpp:72:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("campion.in","r",stdin); ^ user.cpp:73:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("campion.out","w",stdout); ^ user.cpp:75:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%lf", &n, &T); ^ user.cpp: In member function ‘void Line::read(int)’: user.cpp:28:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &R, &D); ^