题目：https://pintia.cn/problem-sets/994805342720868352/problems/994805478658260992

这题不难，一遍AC

代码

  1. #include<cstdio>
  2. #include<string>
  3. #include<vector>
  4. #include<iostream>
  5. using namespace std;
  7. int main(){
  8.     string input, twice;
  9.     vector<int> hash(10, 0);
  10.     cin>>input;
  11.     for(int i = 0; i < input.size(); i++){
  12.         hash[input[i] - '0']++;
  13.     }
  14.     int carry = 0;
  15.     for(int i = input.size() - 1; i >= 0; i--){
  16.         int temp = (input[i] - '0') * 2 + carry;
  17.         carry = temp / 10;
  18.         temp = temp % 10;
  19.         twice.insert(0, to_string((long long)temp));
  20.     }
  21.     if(carry != 0) twice.insert(0, to_string((long long)carry));
  22.     for(int i = 0; i < twice.size(); i++){
  23.         hash[twice[i] - '0']--;
  24.     }
  25.     int flag = 0;
  26.     for(int i = 0; i < hash.size(); i++){
  27.         if(hash[i] != 0){
  28.             flag = 1;
  29.             break;
  30.         }
  31.     }
  32.     flag == 0 ? printf("Yes\n") : printf("No\n");
  33.     cout<<twice;
  34. }