Compilare: user.cpp: In function ‘void dfs2(int)’: user.cpp:53:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[node].size(); ++i) ^ user.cpp:57:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<v[node].size(); ++i) ^ user.cpp:66:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[node].size(); ++i) ^ user.cpp:70:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i+1 < v[node].size()) val = best(val, r[i+1] + 2); ^ user.cpp: In function ‘int main()’: user.cpp:84:48: warning: second operand of conditional expression has no effect [-Wunused-value] else if(n == 2) { fout << k ? 2 : 0 << '\n'; return 0; } ^ user.cpp:84:48: warning: third operand of conditional expression has no effect [-Wunused-value]