#include <bits/stdc++.h> using namespace std; int main() { for (string str; cin >> str; ) { vector<int> used(10, 0); int digit = -1, theMin = 0x3f3f3f3f; for (auto it = str.begin(); it != str.end(); ++it) ++used[*it - '0']; for (int i = 1; i < 10; i++) if (theMin > used[i]) theMin = used[i], digit = i; if (used[0] + 1 <= theMin) cout << "1" + string(used[0] + 1, '0') << endl; else cout << string(theMin + 1, digit + '0') << endl; } return 0; } 第二题16行写错了，已经改正过来了，上面是正确代码