Submission #781833

#	Time	Username	Problem	Language	Result	Execution time	Memory
781833		acatmeowmeow	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	1083 ms	17260 KiB

shoes

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

using namespace std;

#define int long long

void remove(set<int>&lef, vector<set<int>>&pos, vector<signed>&s, int p) {
	if (s[p] < 0) lef.erase(p);
	else pos[s[p]].erase(p);
	if (s[p + 1] < 0) lef.erase(p + 1);
	else pos[s[p + 1]].erase(p + 1);
}

void add(set<int>&lef, vector<set<int>>&pos, vector<signed>&s, int p) {
	if (s[p] < 0) lef.insert(p);
	else pos[s[p]].insert(p);
	if (s[p + 1] < 0) lef.insert(p + 1);
	else pos[s[p + 1]].insert(p + 1);
}

long long count_swaps(std::vector<signed> s) {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	set<int> lef, rig;
	int n = s.size()/2;
	vector<set<int>> pos(n + 5);
	for (int i = 0; i < 2*n; i++) {
		if (s[i] > 0) pos[s[i]].insert(i);	
		if (s[i] < 0) lef.insert(i);
	}
	int ans = 0, index = 0;
	while (index < 2*n) {
		int l = *lef.begin();
		for (int i = l - 1; i >= index; i--) {
			remove(lef, pos, s, i);
			swap(s[i], s[i + 1]);
			add(lef, pos, s, i);
			ans++;
		}
		lef.erase(index);
		int r = *pos[-s[index]].begin();
		index++;
		for (int i = r - 1; i >= index; i--) {
			remove(lef, pos, s, i);
			swap(s[i], s[i + 1]);
			add(lef, pos, s, i);
			ans++;
		}
		pos[s[index]].erase(index);
		index++;
	}
	return ans;
}

/*signed main() {
	int n;
	cin >> n;
	vector<signed> arr(2*n);
	for (int i = 0; i < 2*n; i++) cin >> arr[i];
	cout << count_swaps(arr) << '\n';
	return 0;
}*/

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