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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4.  
  5. int main() {
  6.     int n;
  7.     cin>>n;
  8.     vector<int> b;
  9.     for(int i=0;i<2*n;i++) {
  10.         int temp;
  11.         cin>>temp;
  12.         b.push_back(temp);
  13.     }
  14.     int count1=0;
  15.     while(b.size()!=0) {
  16.         int val;
  17.         for(int i=1;i<b.size();i++) {
  18.             if(b[i]==b[0]){
  19.                 val=i;
  20.                 break;
  21.             }
  22.         }
  23.         if(val!=1)
  24.        count1+=(val-1);
  25.        b.erase(b.begin()+val);
  26.        b.erase(b.begin());
  27.     }
  28.     cout<<count1<<endl;
  29. }
  30.  
Success #stdin #stdout 0s 4392KB
comments (?)
stdin 
3
1 1 2 2 3 3
stdout 
0
https://ideone.com/n0UjCL
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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