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L1-075 Obsessive compulsive disorder (10 branch )

• The question

  Xiaoqiang is counting the date of birth of residents in a community , But I found that the birthday format filled in by everyone is not uniform , For example, some people write 199808, Some people only write 9808. Xiaoqiang with obsessive-compulsive disorder, please write a program , Put everyone's date of birth into Year after year - The moon Format . For those who only write the last two digits of the year , We default to less than 22 All are 20 At the beginning , Others are 19 At the beginning .

• Ideas

  Add C++ string The correlation function of

  • stoll take string Turn into long long
  • to_string() Convert any type to string
  • strstr(s1, s2) kmp Complexity , find s2 stay s1 The first subscript in
  • string.c_str() It can be understood as string Turn into char Array output , In this way, we can %s Output

• Code

  /* * @Author: NEFU AB-IN * @Date: 2022-04-22 16:45:11 * @FilePath: \ACM\GPLT\L1-075.CPP * @LastEditTime: 2022-04-22 16:56:30 */
  #include <bits/stdc++.h>
  using namespace std;
  #define int long long
  #define MP make_pair
  #define SZ(X) ((int)(X).size())
  #define IOS \ ios::sync_with_stdio(false); \ cin.tie(0); \ cout.tie(0);
  #define DEBUG(X) cout << #X << ": " << X << endl;
  typedef pair<int, int> PII;
  const int INF = 0x3f3f3f3f;
  
  signed main()
  {
        
      IOS;
      string s, year, month;
      cin >> s;
      if (SZ(s) == 6)
      {
        
          year = s.substr(0, 4);
          month = s.substr(4, 2);
          printf("%s-%s", year.c_str(), month.c_str());
      }
      else
      {
        
          year = s.substr(0, 2);
          month = s.substr(2, 2);
          int y = stoll(year);
          if (y < 22)
              printf("20%s-%s", year.c_str(), month.c_str());
          else
              printf("19%s-%s", year.c_str(), month.c_str());
      }
  
      return 0;
  }