Compilare: user.cpp: In function ‘bool inc(std::vector<int>, std::vector<int>)’: user.cpp:110:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( p < lst2.size() && x == lst2[p] ) ^ user.cpp:114:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return ( p == lst2.size() ); ^ user.cpp: In function ‘int main()’: user.cpp:138:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < edg[i].size(); j ++ ) { ^ user.cpp:139:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int k = j + 1; k < edg[i].size(); k ++ ) { ^ user.cpp:159:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int k = 0; k < lst.size(); k ++ ) { ^ user.cpp:160:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( cnt[j][lst[k]] != lst.size() - 1 ) ^ user.cpp:168:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int k = 0; k < edg[j].size(); k ++ ) { ^ user.cpp:169:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int p = k + 1; p < edg[j].size(); p ++ ) { ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:14:38: 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); ^