Submission #1217761

#	Time	Username	Problem	Language	Result	Execution time	Memory
1217761		12baater	Arranging Shoes (IOI19_shoes)	C++20	10 / 100	1100 ms	149576 KiB

shoes

#include "shoes.h"
#include <vector>
#include <iostream>
#include <queue>
#include <algorithm>
using namespace std;
typedef long long ll;

const long long MAXN = 100000;

ll total = 0;
vector<queue<int> > indices(210000);

struct ST {
	int n;
	vector<int> seg;

	ST (int N) : n(2*N), seg(4*n) {}

	void update(int l, int r) {
		l += n; r += n;
		while (l<r) {
			if(l&1) seg[l++]++;
			if(r&1) seg[--r]++;
			l >>= 1;
			r >>= 1;
		}
	}

	ll query(int pos) {
		ll ret = 0;
		while(pos > 0) {
			ret += seg[pos];
			pos >>= 1;
		}
		return ret;
	}
};

long long count_swaps(vector<int> s) {
	int n = s.size()/2;
	for (int i = 0; i < s.size(); i++) {
		indices[s[i]+MAXN].push(i);
	}
	ST tree(s.size());
	int val, other, nextInd;
	for(int i = 0; i < n; i++) {
		val = s[2*i]; other = -val;
		nextInd = indices[other+MAXN].front(); indices[other+MAXN].pop();
		nextInd += tree.query(nextInd);
		for(int j = nextInd-1; j > 2*i; j--) {
			swap(s[j],s[j+1]);
			total++;
		}
		if (s[2*i] > s[2*i+1]) total++;
		tree.update(0,nextInd);
	}
	return total;
}

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