Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:74:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();++i) ~^~~~~~~~~~~~~~ user.cpp: In function ‘void dfs1(int, int)’: user.cpp:120:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();++i) ~^~~~~~~~~~~~~~ user.cpp: In function ‘void dfs2(int, int, long long int, long long int)’: user.cpp:140:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();++i) ~^~~~~~~~~~~~~~ user.cpp:148:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();++i) ~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:187:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(culori[i].size()<=bs) ~~~~~~~~~~~~~~~~^~~~ user.cpp:190:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<culori[i].size()-1;++j) ~^~~~~~~~~~~~~~~~~~~ user.cpp:191:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=j+1;k<culori[i].size();++k) ~^~~~~~~~~~~~~~~~~ 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); ^