Compilare: user.cpp: In function ‘void read()’: user.cpp:58:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<in.size();i++) { ^ user.cpp: In function ‘void dfs(int)’: user.cpp:82:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<V[node].size();i++) { ^ user.cpp: In function ‘void solve()’: user.cpp:91:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<words.size();i++) ^ user.cpp:92:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=i+1;j<words.size();j++) ^