Submission #158381

#	Time	Username	Problem	Language	Result	Execution time	Memory
158381		ismagilov	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	1089 ms	3324 KiB

shoes

#include<bits/stdc++.h>
using namespace std ;
long  long count_swaps (vector<int>s)
{
  int  n = s.size();
  bool  c=1;
      long long  ans = 0 ;
      for(int i = 0 ;i<=n/2;i++)
      {
      	if(s[i]!=-s[2*i-1]){c=0;break;}
      }
      n=n/2LL;
      if(c)return n*(n-1)/2LL;
      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;
  }

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:14:24: 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: 0 / 15
• Subtask 5: 20 / 20
• Subtask 6: 0 / 15