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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. bool isValidNr(int nr) {
  5.     int fstDig = nr / 100, secDig = nr / 10 % 10, lastDig = nr % 10;
  6.     return nr >= 100 && nr <= 999 && fstDig < secDig && secDig < lastDig;
  7. }
  8.  
  9. int findValidNr(int frq[]) {
  10.     for (int currNr = 100; currNr <= 999; ++currNr) {
  11.         if (frq[currNr] == 1) {
  12.             return currNr;
  13.         }
  14.     }
  15.     return 0;
  16. }
  17.  
  18. int main() {
  19.     int n, frq[1000] = {0};
  20.     cin >> n;
  21.     for (int i = 1; i <= n; ++i) {
  22.         int currEl;
  23.         cin >> currEl;
  24.         if (isValidNr(currEl)) {
  25.             ++frq[currEl];
  26.         }
  27.     }
  28.     cout << findValidNr(frq);
  29.     return 0;
  30. }
  31.  
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/hxmuWD
language:
C++ (gcc 8.3)
created:
9 hours ago
visibility:
public

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