Submission #1293020

#	Time	Username	Problem	Language	Result	Execution time	Memory
1293020		lukaye_19	Arranging Shoes (IOI19_shoes)	C++20	50 / 100	1095 ms	2728 KiB

shoes

#include <bits/stdc++.h>
using namespace std;

long long count_swaps(vector<int>Shoes) {
    vector<int>ShoesQueue = Shoes;
    
    int Answer = 0;
    
    int TargetShoeSize = 0;
    bool AllSameSize = true;
    
    for (int i = 0; i < ShoesQueue.size(); i++)
    {
      int Size = ShoesQueue[i];
      int AbsoluteSize = abs(Size);
      
      if (i == 0)
      {
        TargetShoeSize = AbsoluteSize;
      }
      else if (TargetShoeSize != AbsoluteSize)
      {
        AllSameSize = false;
      }
    }
    
    if (AllSameSize)
    {
      int SameSizeAnswer = 0;
      
      int Index = 0;
      int LeftShoes = 0;
      
      while (Index < ShoesQueue.size())
      {
        int FirstShoe = ShoesQueue[Index];
        
        if (FirstShoe < 0)
        {
          int TargetPosition = LeftShoes * 2;
          int Distance = abs(TargetPosition - Index);
          
          SameSizeAnswer += Distance;
          
          LeftShoes++;
        }
        
        Index++;
      }
      
      return SameSizeAnswer;
    }

    while (!ShoesQueue.empty()) 
    {
        int FirstShoe = -(*ShoesQueue.begin());

        int DistanceToPair = 0;
        
        auto it = ++ShoesQueue.begin();

        while (*it != FirstShoe) 
        {
            ++it;
            
            DistanceToPair++;
        }

        ShoesQueue.erase(it);
        ShoesQueue.erase(ShoesQueue.begin());
        
        Answer += DistanceToPair;

        if (FirstShoe < 0) 
        {
            Answer++;
        }
    }

    return Answer;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 20 / 20
• Subtask 6: 0 / 15