第一题 #include <bits/stdc++.h> using namespace std; //重写小于比较器 struct less { bool operator() (const string& s1, const string& s2) const { auto it1 = s1.cbegin(); auto it2 = s2.cbegin(); for (; it1 != s1.cend() && it2 != s2.cend(); ++it1, ++it2) ...