Compilare: user.cpp: In function ‘void buildA()’: user.cpp:32:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[i].size(); j++) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:83:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘void findAns()’: user.cpp:101:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[i].size(); j++) ^ user.cpp:109:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[N].size(); i++) ^