Submission #398500

#	Time	Username	Problem	Language	Result	Execution time	Memory
398500		kevinxiehk	Arranging Shoes (IOI19_shoes)	C++17	45 / 100	148 ms	140604 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll fen[200005];
int n;
void update(int id, int val) {
    id++;
    while(id <= n + 1) {
        fen[id] += val;
        id += (id & (-id));
    }
    return;
}
ll pre(int id) {
    if(id <= -1) return 0;
    int ans = 0;
    id++;
    while(id) {
        ans += fen[id];
        id -= (id & (-id));
    }
    return ans; 
}
int range(int l, int r){
    return pre(r) - pre(l - 1);
}
long long count_swaps(vector<int> arr) {
	n = arr.size();
	queue<int> pl[n + 5];
	int dk[n + 5];
	int t = 0;
	for(int i = 0; i < n; i++) {
		if(arr[i] < 0) {
			dk[i] = t;
			t++;
			pl[-arr[i]].push(t);
			t++;
		}
	}
	for(int i = 0; i < n; i++) {
		if(arr[i] > 0) {
			dk[i] = pl[arr[i]].front();
			pl[arr[i]].pop();
		} 
	}
	ll ans = 0;
	for(int i = 0; i < n; i++) {
		ans += i - pre(dk[i]);
		update(dk[i], 1);
	}
	return ans;
}

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