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  1. //
  2. // Created by Ayan Ginet on 03.04.2018.
  3. //
  4. #include <iostream>
  5. #include <cmath>
  6. #include <cstdio>
  7. #include <vector>
  8. #include <algorithm>
  9. #include <map>
  10.  
  11.  
  12. using namespace std;
  13.  
  14. bool myComparison(const pair<long long,pair<long long, long long>> &a,
  15.                   const pair<long long, pair<long, long>> &b)
  16. {
  17.     return a.second.first < b.second.first;
  18. }
  19.  
  20. bool cmp(const pair<long, long> &a,
  21.                   const pair<long, long> &b)
  22. {
  23.     return a.first < b.first;
  24. }
  25.  
  26. vector<int> swap( vector<int> &nums, int first, int second){
  27.     if(second >= nums.size()) return nums;
  28.     int buf = nums[first];
  29.     nums[first] = nums[second];
  30.     nums[second] = buf;
  31.     return nums;
  32. }
  33.  
  34. int minSwap( vector<int> &nums, int i, int n){
  35.     if(i > n) return 0;
  36.  
  37.     if(nums[i] == nums[i+1])
  38.     return minSwap( nums, i + 2,  n);
  39.  
  40.     nums = swap(nums, i, i + 1);
  41.     int a = 1;
  42.     a += minSwap(nums, i + 1, n);
  43.  
  44.     nums = swap(nums, i , i + 1);
  45.     nums = swap(nums, i + 1 , i + 2);
  46.     int b = 1 + minSwap(nums, i + 1, n);
  47.  
  48.     return min(a,b);
  49.  
  50. }
  51.  
  52.  
  53.  
  54. int main(){
  55.     std::ios::sync_with_stdio(false);
  56.     cin.tie(nullptr);
  57.  
  58.    int n;
  59.    cin >> n;
  60.  
  61.    vector<int> nums;
  62.  
  63.    for(int i = 0; i < 2 * n; i++){
  64.        int buf;
  65.        cin >> buf;
  66.        nums.push_back(buf);
  67.    }
  68.  
  69.     cout << minSwap(nums, 0, nums.size());
  70.  
  71. }
Success #stdin #stdout 0s 4348KB
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https://ideone.com/KZ76Aq
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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