Compilare: user.cpp: In function ‘void bfs()’: user.cpp:40:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[u1].size(); i++){ ^ user.cpp: In function ‘bool dfs(int)’: user.cpp:54:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[u1].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:128:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < g[i].size(); j++){ ^