제출 #1070779

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1070779		dosts	Arranging Shoes (IOI19_shoes)	C++17	100 / 100	77 ms	20436 KiB

shoes

//Dost SEFEROĞLU
#include <bits/stdc++.h>
#include "shoes.h"
using namespace std;
#define int long long
#define pii pair<int,int>
#define ff first
#define ss second
#define sp << " " <<    
#define all(cont) cont.begin(),cont.end()
#define vi vector<int>
const int MOD = 1e9+7,inf = 2e18;
const int N = 1e5+50;
struct FT {
	int n;
	vi bit;
	FT(int nn) {
		n = nn;
		bit.assign(n+1,0);
	}
	int get(int p) {
		int ans = 0;
		for (int i=p;i>0;i-=i&-i) ans += bit[i];
		return ans;
	}
	void put(int p,int v) {
		for (int i=p;i<=n;i+=i&-i) bit[i]+=v;
	}
};
long long count_swaps(std::vector<int32_t> s) {
	int n = s.size();
	FT ft(n);
	for (int i=1;i<=n;i++) ft.put(i,1);
	int sm = 0;
	vi pos[n+1];
	for (int i=1;i<=n;i++) pos[abs(s[i-1])].push_back(i);
	for (int i=1;i<=n;i++) {
		stack<int> left,right;
		for (auto it : pos[i]) {
			if (s[it-1] > 0) right.push(it);
			else left.push(it);
			if (!left.empty() && !right.empty()) {
				int a = left.top(),b = right.top();
				if (a > b) {
					sm++;
					s[a-1] = -s[a-1];
					s[b-1] = -s[b-1];
				}
				left.pop(),right.pop();
			}
		}
	}
	vi rights[n+1];
	for (int i=1;i<=n;i++) if (s[i-1] > 0) rights[s[i-1]].push_back(i);
	for (int i=1;i<=n;i++) reverse(all(rights[i]));
	for (int i=1;i<=n;i++) {
		if (s[i-1] < 0) {
			int nxt = rights[-s[i-1]].back();
			rights[-s[i-1]].pop_back();
			sm+=ft.get(nxt)-ft.get(i)-1;
			ft.put(nxt,-1);
		}
	}
	return sm;
}

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