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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int t; cin >> t;
  6.     while (t--) {
  7.         int n, a[100], res = 0;
  8.         cin >> n;
  9.         for (int i = 0; i < n; i++) cin >> a[i];
  10.         for (int i = 0; i < n; i++) {
  11.             for (int j = i + 1; j < n; j++) {
  12.                 int x = a[i], y = a[j], d = abs(x - y);
  13.                 if (x == y) res = max(res, x + 1);
  14.                 for (int k = 1; k <= d; k++) {
  15.                     if (d % k == 0) {
  16.                         int g1 = x + (k - x % k) % k;
  17.                         int g2 = y + (k - y % k) % k;
  18.                         while (g2) {
  19.                             int tmp = g2;
  20.                             g2 = g1 % g2;
  21.                             g1 = tmp;
  22.                         }
  23.                         res = max(res, g1);
  24.                     }
  25.                 }
  26.             }
  27.         }
  28.         cout << res << "\n";
  29.     }
  30. }
  31.  
Success #stdin #stdout 0s 5316KB
comments (?)
stdin
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4
2
1 3
5
5 4 3 2 1
3
5 6 7
3
1 11 10
stdout
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2
4
2
10
https://ideone.com/uiKVqJ
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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