Submission #895486

#	Time	Username	Problem	Language	Result	Execution time	Memory
895486		ByeWorld	Arranging Shoes (IOI19_shoes)	C++14	100 / 100	187 ms	275732 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int MAXN = 2e5+20;

int skip[MAXN];
queue <int> vec[2*MAXN];
int n;
ll ans;
int st[2*MAXN];
int que(int x){
	int te = 0;
	for(; x>0; x-=x&(-x)) te += st[x];
	return te;
}
void upd(int x, int y){
	for(; x<=2*MAXN-10; x+=x&(-x)) st[x]+=y;
}
long long count_swaps(vector<int> s) {
	n = s.size();
	for(int i=0; i<n; i++){
		if(s[i] < 0) vec[MAXN-s[i]].push(i);
		else vec[s[i]].push(i);
	}
	//cout << vec[2].front() << "p\n";
	for(int i=0; i<n; i++){
		if(skip[i]) continue;
		if(s[i] < 0){
			int idx = vec[-s[i]].front();
			skip[idx] = 1;
			ans += (ll)(idx-i-1 - (que(idx)-que(i)));
			upd(idx, 1);
			//cout << i << ' '<< idx << " idx\n";
			vec[-s[i]].pop(); vec[MAXN-s[i]].pop();
		} else {
			int idx = vec[MAXN+s[i]].front();
			skip[idx] = 1;
			ans += (ll)(idx-i - (que(idx)-que(i)));
			upd(idx, 1);
			//cout << i << ' '<< idx << " idx\n";
			vec[MAXN+s[i]].pop(); vec[s[i]].pop();
		}
	}
	return ans;
}

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