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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main(){
  4.     int arr[6]={1,1,2,2,2,1};
  5.     unordered_map<int,int>hmap;
  6.     int diff=0;
  7.     for(int i=0;i<6;i++){
  8.         if(hmap.find(arr[i])==hmap.end()){
  9.             hmap[arr[i]]=i;
  10.         }
  11.         else{
  12.             diff=max(diff,i-hmap[arr[i]]);
  13.         }
  14.     }
  15. cout<< diff;       
  16. }
Success #stdin #stdout 0.01s 5304KB
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stdin 
Standard input is empty
stdout 
5
https://ideone.com/5rLH6F
language:
C++14 (gcc 8.3)
created:
7 hours ago
visibility:
public

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