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  1. // Example program
  2. #include <iostream>
  3. #include <string>
  4. using namespace std;
  5.  
  6. int main()
  7. {
  8.   int sum;  
  9.   int arr[4] = {1,2,4,4};
  10.  
  11.   cin >> sum;
  12.  
  13.   int left = 0;
  14.   int right = 4-1;
  15.  
  16.   for (int i = 0; i < 4; i++) {          
  17.     if (arr[left]+arr[right] > sum) {
  18.         --right;
  19.     }
  20.     else if (arr[left]+arr[right] < sum) {
  21.         ++left;    
  22.     }
  23.  
  24.     if (arr[left]+arr[right] == sum) {
  25.         cout << "FOUND!";
  26.         break;
  27.     }
  28.     else if (i == 3 && arr[left]+arr[right]!=sum) {
  29.         cout << "SORRY!";
  30.     }
  31.  
  32.   }
  33.  
  34. }
  35.  
Success #stdin #stdout 0s 16048KB
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stdin
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stdout
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FOUND!
https://ideone.com/lozA5s
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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