Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:25:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[n].size(); ++i) ^ user.cpp: In function ‘void dfst(int)’: user.cpp:35:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<w[n].size(); ++i) ^ user.cpp: In function ‘void bkt(int)’: user.cpp:51:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[x].size(); ++i) ^ user.cpp:63:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[x].size() && ok; ++i) ^ user.cpp: In function ‘int main()’: user.cpp:94:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ans[k].size()>mx) ^ user.cpp:100:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<ans[ind].size(); ++i) ^