fork download
copy 
  1. #include<bits/stdc++.h>
  2. using namespace std ;
  3. int n;
  4. long long a[200005], res; 
  5.  
  6. int main()
  7. {
  8.     ios::sync_with_stdio(0);
  9.     cin.tie(0);
  10.     cout.tie(0);
  11.     if(fopen("mm.inp","r"))
  12.     {
  13.         freopen("mm.inp","r",stdin);
  14.         freopen("mm.out","w",stdout);
  15.     }
  16.     cin >> n;
  17.     for(int i=0; i<n; i++)
  18.         cin >> a[i];
  19.  
  20.     sort(a, a+n);
  21.     n = unique(a, a+n) - a; 
  22.  
  23.     res=0;
  24.     for(int i=0; i<n; i++)
  25.     {
  26.         for(long long j = 2LL * a[i]; j <= a[n-1] + a[i]; j += a[i])
  27.         {
  28.             auto num_ptr = lower_bound(a + i, a + n, j);
  29.             num_ptr--;
  30.             long long x = *num_ptr;
  31.             if (x >= j - a[i]) {
  32.                 res = max(res, x % a[i]);
  33.             }
  34.         }
  35.     }
  36.     cout << res;
  37.     return 0 ;
  38. }
  39.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Standard output is empty
https://ideone.com/oR77aQ
language:
C++14 (gcc 8.3)
created:
5 hours ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!