Submission #301910

#	Time	Username	Problem	Language	Result	Execution time	Memory
301910		NicolaAbusaad2014	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	1074 ms	3704 KiB

shoes

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

long long count_swaps(std::vector<int> s) {
    long n=s.size();
    long long arr[n]={},x,z,ans=0;
    bool ok[n]={};
    for(long i=0;i<n;i++){
    if(!ok[i]){
    for(long j=i+1;j<n;j++){
    if(s[j]==(-s[i])&&(!ok[j])){
    ok[j]=true;
    x=j;
    break;
    }
    arr[j]++;
    }
    ans+=(x+arr[x])-(i+arr[i])-1;
    if(s[i]>0){
    ans++;
    }
    }
    }
    return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:7:27: warning: unused variable 'z' [-Wunused-variable]
    7 |     long long arr[n]={},x,z,ans=0;
      |                           ^
shoes.cpp:19:12: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   19 |     ans+=(x+arr[x])-(i+arr[i])-1;
      |          ~~^~~~~~~~

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