Submission #774768

#	Time	Username	Problem	Language	Result	Execution time	Memory
774768		Sandarach151	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1 ms	300 KiB

shoes

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

long long count_swaps(std::vector<int> s) {
    int n = s.size()/2;
	stack<int> negative[n+1];
    stack<int> positive[n+1];
    long long ans = 0;
    for(int i=0; i<2*n; i++){
        if(s[i]<0){
            if(!positive[-1*s[i]].empty()){
                ans+= i-positive[-1*s[i]].top();
                positive[-1*s[i]].pop();
            }
            else{
                negative[-1*s[i]].push(i);
            }
        }
        else{
            if(!negative[s[i]].empty()){
                ans+= i-negative[s[i]].top()-1;
                negative[s[i]].pop();
            }
            else{
                positive[s[i]].push(i);
            }
        }
    }
    return ans;
}

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