Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:47:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<edge[node].size(); i++){ ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:100:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<ca[color].size(); i++){ ~^~~~~~~~~~~~~~~~~ main.cpp:105:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<cb[color].size(); i++){ ~^~~~~~~~~~~~~~~~~