Submission #660073

#	Time	Username	Problem	Language	Result	Execution time	Memory
660073		ymm	The Collection Game (BOI21_swaps)	C++17	0 / 100	53 ms	208 KiB

swaps

#include "swaps.h"
#include <bits/stdc++.h>
#define Loop(x,l,r) for (ll x = (l); x < (ll)(r); ++x)
#define LoopR(x,l,r) for (ll x = (r)-1; x >= (ll)(l); --x)
typedef long long ll;
typedef std::pair<int, int> pii;
typedef std::pair<ll , ll > pll;
using namespace std;

const int LG = 9;
const int N = 1<<LG;
vector<int> ord;
vector<pii> sched;
int n;

vector<int> cmp()
{
	int cnt = 0;
	for (auto [i, j] : sched) {
		int x = ord[i];
		int y = ord[j];
		if (x > n || y > n)
			continue;
		schedule(x, y);
		++cnt;
	}
	vector<int> res = cnt? visit(): vector<int>(), ans;
	reverse(res.begin(), res.end());
	for (auto [i, j] : sched) {
		int x = ord[i];
		int y = ord[j];
		if (x > n || y > n) {
			ans.push_back(x < y);
		} else {
			ans.push_back(res.back());
			res.pop_back();
		}
	}
	sched.clear();
	return ans;
}

void Do(int cnt)
{
	for (int sz = N/2; cnt--; sz /= 2) {
		Loop (i,0,N/2)
			sched.push_back({2*i, 2*i+1});
		auto res = cmp();
		vector<int> vec;
		for (int l = 0; l < N/2; l += sz) {
			int r = l + sz;
			Loop (i,l,r)
				vec.push_back(ord[2*i + !res[i]]);
			Loop (i,l,r)
				vec.push_back(ord[2*i + res[i]]);
		}
		ord = vec;
	}
}

void solve(int _n, int v)
{
	n = _n;
	ord.resize(N);
	iota(ord.begin(), ord.end(), 1);
	Loop (_,0,v/LG)
		Do(LG);
	if (ord[N-2] != N-1) {
		Loop (i,0,N) {
			int j = 0;
			Loop (k,0,LG) {
				j <<= 1;
				j ^= (i>>k)&1;
			}
			if (i < j)
				swap(ord[i], ord[j]);
		}
	}
	ord.resize(n);
	answer(ord);
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 3
• Subtask 4: 0 / 2
• Subtask 5: 0 / 9
• Subtask 6: 0 / 6
• Subtask 7: 0 / 9
• Subtask 8: 0 / 6
• Subtask 9: 0 / 21
• Subtask 10: 0 / 14
• Subtask 11: 0 / 9
• Subtask 12: 0 / 6