Submission #789313

#	Time	Username	Problem	Language	Result	Execution time	Memory
789313		ymm	Abracadabra (CEOI22_abracadabra)	C++17	10 / 100	3042 ms	43124 KiB

Main

#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
#define Loop(x,l,r) for (ll x = (l); x < (r); ++x)
typedef long long ll;
typedef std::pair<int,int> pii;
using namespace std;

vector<int> shf(vector<int> vec)
{
	int n = vec.size();
	vector<int> ans;
	int p0 = 0, p1 = n/2;
	Loop (_,0,n) {
		if (p1 == n || (p0 < n/2 && vec[p0] < vec[p1]))
			ans.push_back(vec[p0++]);
		else
			ans.push_back(vec[p1++]);
	}
	return ans;
}

const int N = 1'000'010;
int ans[N];
vector<pii> Q[N];

int main()
{
	cin.tie(0) -> sync_with_stdio(false);
	int n, q;
	cin >> n >> q;
	vector<int> vec(n);
	//iota(vec.begin(), vec.end(), 0);
	//auto pleh = vec;
	//int cntt = 0;
	//for (;;) {
	//	int cnt = 0;
	//	vec = pleh;
	//	for (;;) {
	//		auto tmp = shf(vec);
	//		if (tmp == vec)
	//			break;
	//		vec = tmp;
	//		++cnt;
	//	}
	//	cntt = max(cntt, cnt);
	//	if (!next_permutation(pleh.begin(), pleh.end()))
	//		break;
	//}
	//cout << cntt << '\n';
	//return 0;
	//mt19937_64 rd(chrono::high_resolution_clock::now().time_since_epoch().count());
	//iota(vec.begin(), vec.end(), 0);
	//shuffle(vec.begin(), vec.end(), rd);
	for (int &x : vec)
		cin >> x;
	//vecs.push_back(vec);
	Loop (i,0,q) {
		int t, p;
		cin >> t >> p;
		--p;
		t = min(t, n);
		Q[t].push_back({p, i});
	}
	int p0 = 0, p1 = n;
	vector<int> vec2(n);
	Loop (i,0,n) {
		for (auto [p, j] : Q[i])
			ans[j] = vec[p];
		merge(vec.data()+p0, vec.data()+n/2, vec.data()+n/2, vec.data()+p1, vec2.data()+p0);//vec = shf(vec);
		vec.swap(vec2);
		//while (p0 < n/2 && vec[p0] == vec2[p0])
		//	++p0;
		//while (n/2 < p1 && vec[p1-1] == vec2[p1-1])
		//	--p1;
		//vec = shf(vec);
	}
	for (auto [p, j] : Q[n])
		ans[j] = vec[p];
	Loop (i,0,q)
		cout << ans[i] << '\n';
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25