Compilare: main.cpp: In function 'void dfs(int)': main.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < edges[x].size();++i) { ~~^~~~~~~~~~~~~~~~~ main.cpp:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < edges[x].size();++i) { ~~^~~~~~~~~~~~~~~~~ main.cpp:38:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < edges[x].size();++i) { ~~^~~~~~~~~~~~~~~~~