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<nod[x].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:53:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<rnod[x].size(); j++) ~^~~~~~~~~~~~~~~ main.cpp:59:85: warning: suggest parentheses around assignment used as truth value [-Wparentheses] for(int i=1; i<=n; i++) nod[i].clear(), rnod[i].clear(), viz[i] = dp[i] = 0; ~~~~~~^~~