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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n;
  6.     cin >> n;
  7.     string boards;
  8.     cin >> boards;
  9.     char newBoard;
  10.     cin >> newBoard;
  11.  
  12.     int pos = -1;
  13.     for (int i = 0; i < n; i++) {
  14.         char cur = boards[i];
  15.         char nxt = boards[(i + 1) % n];
  16.         // 插入在 i 和 i+1 之间
  17.         if (cur <= newBoard && newBoard <= nxt) {
  18.             pos = i + 1;
  19.             break;  // 找到第一个合法位置，最小下标
  20.         }
  21.     }
  22.  
  23.     // 如果没找到合适位置（比如比所有都小或大），插入到合适循环点
  24.     if (pos == -1) {
  25.         for (int i = 0; i < n; i++) {
  26.             char cur = boards[i];
  27.             char nxt = boards[(i + 1) % n];
  28.             if (cur > nxt) { // 循环断点
  29.                 if (newBoard >= cur || newBoard <= nxt) {
  30.                     pos = i + 1;
  31.                     break;
  32.                 }
  33.             }
  34.         }
  35.     }
  36.  
  37.     // 默认插在开头
  38.     if (pos == -1) pos = 0;
  39.  
  40.     boards.insert(pos, 1, newBoard);
  41.     cout << boards << endl;
  42.  
  43.     return 0;
  44. }
  45.  
Success #stdin #stdout 0.01s 5272KB
comments (?)
stdin 
4
2342
1
stdout 
23412
https://ideone.com/D8IuJ8
language:
C++ (gcc 8.3)
created:
6 days ago
visibility:
public

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