Compilare: main.cpp: In function 'int verif(int, int)': main.cpp:14:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void update_frecv(int, int, int)': main.cpp:22:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void back(int)': main.cpp:40:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<w[i].size();j++){ ~^~~~~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:65:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[x].size();i++){ ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:91:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<L[i].size();j++){ ~^~~~~~~~~~~~ main.cpp:109:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<L[nod].size();j++){ ~^~~~~~~~~~~~~~