Submission #1230470

#	Time	Username	Problem	Language	Result	Execution time	Memory
1230470		neisenn	Arranging Shoes (IOI19_shoes)	C++20	0 / 100	0 ms	324 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
int seg[500050];

void add(int val, int L, int R, int x){
    if (L == R){
        if (L == x) seg[val]++;
        return;
    }
    int mid = (L+R)/2;
    if (x <= mid) add(val*2+1, L, mid, x);
    else add(val*2+2, mid+1, R, x);
    seg[val] = seg[val*2+1]+seg[val*2+2];
    return;
}

int sum(int val, int L, int R, int l, int r){
    if (L >= l && R <= r) return seg[val];
    if (R < l || L > r) return 0;
    int mid = (L+R)/2;
    return sum(val*2+1, L, mid, l, r)+sum(val*2+2, mid+1, R, l, r);
}

long long count_swaps(std::vector<int> s){
	int n = s.size()/2;
	map<int, priority_queue<int, vector<int>, greater<int>>> l, r;
	for (int i = 0; i < 2*n; i++){
		if (s[i] <= 0){
			l[abs(s[i])].push(i);
		}
		else {
			r[s[i]].push(i);
		}
	}
	vector<bool> vis(2*n+1, 0);
	long long ans = 0;
	for (int i = 0; i < 2*n; i++){
		if (!vis[i]){
			int id;
			if (s[i] <= 0) id = r[abs(s[i])].top();
			else id = l[s[i]].top();
			l[abs(s[i])].pop();
			r[abs(s[i])].pop();
			ans += abs(id-i)-1;
			ans -= sum(0, 0, 2*n-1, i+1, id);
			if (s[i] > 0) ans++;
			vis[i] = 1;
			add(0, 0, 2*n-1, id);
		}
	}
	return ans;
}

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