Submission #244421

#	Time	Username	Problem	Language	Result	Execution time	Memory
244421		tictaccat	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	5 ms	384 KiB

shoes

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

using namespace std;

long long count_swaps(std::vector<int> s) {

	int n = s.size() / 2;

	vector<vector<int>> posL(n+1), posR(n+1);

	for (int i = 0; i < 2*n; i++) {
		if (s[i] > 0) posR[s[i]].push_back(i);
		else posL[-s[i]].push_back(i);
	}

	int ans = 0;

	for (int j = 1; j <= n; j++) {
		for (int k = 0; k < (int)posR[j].size(); k++) {
		//	cout << posL[j][k] << " " << posR[j][k] << "\n";
			ans += abs(posR[j][k] - posL[j][k]) - 1;
			if (posL[j][k] > posR[j][k]) ans++;
		}
	}

	return ans;
}

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