Submission #1290690

#	Time	Username	Problem	Language	Result	Execution time	Memory
1290690		Sofiatpc	Arranging Shoes (IOI19_shoes)	C++20	30 / 100	16 ms	3116 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>

using namespace std;

const int MAXN = 1e5+5;
vector<int> idl[MAXN], idr[MAXN];

long long count_swaps(vector<int> s) {
	int n = s.size()/2;
	for(int i = 0; i < s.size(); i++){
		if(s[i] < 0)idl[-s[i]].push_back(i);
		else idr[s[i]].push_back(i);
	}

	long long ans = 0;
	for(int i = 1; i <= n; i++){
		int cur = 0;
		for(int j = 0; j < idl[i].size(); j++){
			if(idl[i][j] > cur)ans += idl[i][j]-cur;
			cur++;
			if(idr[i][j] > cur)ans += idr[i][j]-cur;
			cur++;
		}
	}
	return ans;
}

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