Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:33:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;(1<<i)<s.size();i++) ~~~~~~^~~~~~~~~ main.cpp:37:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st <= s.size()-1 && nod != 1){ ~~~^~~~~~~~~~~~~ main.cpp:44:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~