Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:13:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[fiu].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<g[i].size(); j++) ~^~~~~~~~~~~~