Submission #520104

#	Time	Username	Problem	Language	Result	Execution time	Memory
520104		A_D	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	1060 ms	3140 KiB

shoes

#include "shoes.h"

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

long long count_swaps(vector<int> s){
    long long ans=0;
    int n=s.size();
    vector<bool> vis(n);
    for(int i=0;i<n;i++){
        if(vis[i])continue;
        vis[i]=1;
        int u=-s[i];
        int k;
        for(int j=i+1;j<n;j++){
            if(vis[j])continue;
            if(s[j]==u){
                k=j;
                vis[j]=1;
                break;
            }
        }
//        cout<<i<<" "<<k<<endl;
  //      for(int j=0;j<n;j++)cout<<s[j]<<" ";cout<<endl;
    //    for(int j=0;j<n;j++)cout<<vis[j]<<" ";cout<<endl;
        int h=i;
        if(s[i]<0)h++;
        for(int j=k;j>h;j--){
            swap(vis[j],vis[j-1]);
            swap(s[j],s[j-1]);
            ans++;
        }
    }
    return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:14:13: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
   14 |         int k;
      |             ^

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