Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:13:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<f[x].size();++i) ^ user.cpp:15:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<f[x].size();++i) ^ user.cpp:18:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<f[x].size()&&v[i]+sum[x]<=s;++i,++sol) ^