Compilare: user.cpp: In function ‘int main()’: user.cpp:56:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=Bucket[pos];D[j][i].size()>Lg;++i){ ^ user.cpp:11:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grid.in","r",stdin); ^ user.cpp:12:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grid.out","w",stdout); ^ user.cpp:9:9: warning: ‘Lg’ may be used uninitialized in this function [-Wmaybe-uninitialized] int Lg, Position[30004], Bucket[30004]; ^