Compilare: main.cpp: In function 'int dfs(int, int)': main.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ main.cpp:16:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<niv[i].size();j++) ~^~~~~~~~~~~~~~