fork download
copy 
  1. #include<bits/stdc++.h>
  2. using namespace std ;
  3. int n, a[100006], res;
  4. int main()
  5. {
  6.     ios::sync_with_stdio(0);
  7.     cin.tie(0);
  8.     cout.tie(0);
  9.     if(fopen("mm.inp","r"))
  10.     {
  11.         freopen("mm.inp","r",stdin);
  12.         freopen("mm.out","w",stdout);
  13.     }
  14.     cin >> n;
  15.     for(int i=1; i<=n; i++)
  16.         cin >> a[i];
  17.     sort(a+1,a+n+1);
  18.     n=unique(a+1,a+n+1)-(a+1);
  19.     res=0;
  20.     for(int i=1; i<=n; i++)
  21.     {
  22.         for(int j=2*a[i]; j<=a[n]+a[i]; j+=a[i])
  23.         {
  24.             auto num=lower_bound(a+1+i, a+1+n, j);
  25.             int x=*(--num);
  26.             if(x>=j-a[i])
  27.                 res=max(res,x%a[i]);
  28.         }
  29.     }
  30.     cout << res;
  31.     return 0 ;
  32. }
  33.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Standard output is empty
https://ideone.com/tEHYI9
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!