Compilare: user.cpp: In function ‘int slv(int, int)’: user.cpp:113:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < gph[x].size(); i ++ ) { ^ user.cpp: In function ‘int main()’: user.cpp:158:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int msk = 0; msk < dp[i].size(); msk ++ ) { ^ user.cpp:161:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < lst[i].size(); j ++ ) { ^ user.cpp:166:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int k = 0; k < lst[y].size(); k ++ ) { ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:18:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^