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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. bool isIncreasing(const string &num) {
  5.     for (size_t i = 1; i < num.size(); i++) {
  6.         if (num[i] < num[i - 1]) return false;
  7.     }
  8.     return true;
  9. }
  10.  
  11. bool isDecreasing(const string &num) {
  12.     for (size_t i = 1; i < num.size(); i++) {
  13.         if (num[i] > num[i - 1]) return false;
  14.     }
  15.     return true;
  16. }
  17.  
  18. void checkNumber(const string &num) {
  19.     if (isIncreasing(num) || isDecreasing(num)) {
  20.         cout << "YES" << endl;
  21.     } else {
  22.         cout << "NO" << endl;
  23.     }
  24. }
  25.  
  26. int main() {
  27.     int t;
  28.     cin >> t;
  29.     while (t--) {
  30.         string num;
  31.         cin >> num;
  32.         checkNumber(num);
  33.     }
  34.     return 0;
  35. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/HC6MGb
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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