Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:57:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<gr[x].size();i++) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:142:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<gr[i].size();j++) ~^~~~~~~~~~~~~ main.cpp: In function 'bool compare(wow, wow)': main.cpp:80:1: warning: control reaches end of non-void function [-Wreturn-type] } ^