Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:24:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[v].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:61:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<C[i].size();j++) ^ user.cpp:64:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<C[i].size();j++) ^ user.cpp:67:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<V[v].size();k++) ^ user.cpp:70:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<V1[v].size();k++) ^