Compilare: main.cpp: In function 'int main()': main.cpp:38:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<v.size();++i) ~^~~~~~~~~ main.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<dummy.size();++i) ~^~~~~~~~~~~~~ main.cpp:49:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<dummy.size();++i) ~^~~~~~~~~~~~~ main.cpp:54:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();++i) ~^~~~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:61:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0,to;i<g[node].size();++i){ ~^~~~~~~~~~~~~~~