Compilare: main.cpp: In function 'void dfs(int)': main.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<a[nod].size();i++) { ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:76:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<a[nod].size();i++) { ~^~~~~~~~~~~~~~ main.cpp: In function 'int cmp(muchie, muchie)': main.cpp:31:1: warning: control reaches end of non-void function [-Wreturn-type] } ^