Compilare: main.cpp: In function 'void dfs(int)': main.cpp:20:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void solve4()': main.cpp:36:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<sol.size(); i++) ~^~~~~~~~~~~ main.cpp: In function 'void dfs1(int, int)': main.cpp:47:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void solve3()': main.cpp:60:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<sol.size(); i++) ~^~~~~~~~~~~