Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:31:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < edges2[cur].size();++i) { ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0;j < edges[cur].size();++j) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:73:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0;j < v.size();++j) { ~~^~~~~~~~~~