Submission #153721

#	Time	Username	Problem	Language	Result	Execution time	Memory
153721		reda	Arranging Shoes (IOI19_shoes)	C++14	45 / 100	32 ms	3224 KiB

shoes

#include<bits/stdc++.h>
using namespace std ;
long  long count_swaps (vector<int>s)
{
  int  n = s.size();
  if(n<=16)
  {
      long long  ans = 0 ;
      for(int i = 0 ;i < s.size();i+=2)
      {
        int j = i+1;
        while(s[i]!=-s[j])
        {
            j++;
        }
        while (j!=i+1)
        {
            swap(s[j],s[j-1]);
            ans++;
            j--;
        }
        if(s[j]<0)
        {
            swap(s[i],s[j]);
            ans++;
        }
      }
      return ans;
  }
  else
  {
      long long x= n/2;
      return x*(x-1)/2;
  }
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:9:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(int i = 0 ;i < s.size();i+=2)
                      ~~^~~~~~~~~~

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