Submission #570962

#	Time	Username	Problem	Language	Result	Execution time	Memory
570962		beaconmc	Secret (JOI14_secret)	C++14	100 / 100	463 ms	4448 KiB

secret

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
typedef long long ll;
#define FOR(i,x,y) for(ll i=x; i<y; i++)
#define FORNEG(i,x,y) for(ll i=x; i>y; i--)
#define double long double
#include "secret.h"

using namespace std;

vector<vector<ll>> sus(1025);
vector<ll> nums(1025);
ll n;

// int Secret(ll a, ll b){
// 	return a+floor(b/2)*2;
// }

void sussy(ll a, ll b){
	if (b-a > 2){
		ll mid = (a+b)/2;

		vector<ll> left;
		vector<ll> right;

		left.push_back(nums[mid-1]);

		FORNEG(i, mid-2, a-1){
			left.push_back(Secret(nums[i], left[left.size()-1]));
		}

		right.push_back(nums[mid]);
		FOR(i,mid+1, b){
			right.push_back(Secret(right[right.size()-1], nums[i]));
		}

		reverse(left.begin(), left.end());

		for (auto&i : left){
			sus[mid].push_back(i);
		}

		for (auto&i : right){
			sus[mid].push_back(i);
		}

		sussy(a, mid);
		sussy(mid, b);
	}
}

void Init(int N, int A[]) {
	n = N;
	FOR(i,0,1025) nums[i] = 1;

	FOR(i,0,N) nums[i] = A[i];

	sussy(0,n);
}

int Query(int L, int R){
	if (R == L+1){
		return Secret(nums[L], nums[R]);
	}
	if (L==R){
		return nums[L];
	}
	ll lo = 0;
	ll hi = n;

	while (lo<hi){
		ll mid = (lo+hi)/2;


		
		if (L<mid && mid<=R){


			ll size = sus[mid].size()/2;

			return Secret(sus[mid][size - (mid - L)], sus[mid][size+(R-mid)]);
		}

		if (mid<=L && mid<=R){
			lo = mid;
		}
		if (mid >= L && mid >= R){
			hi = mid;
		}
	}
}

// int main(){
// 	int sussy[8] =  {1,4,7,2,5,8,3,6};

// 	Init(8, sussy);
// 	cout << Query(0,3) << endl;
// 	cout << Query(1,7) << endl;
// 	cout << Query(5,5) << endl;
// 	cout << Query(2,4) << endl;




// }

Compilation message (stderr)

secret.cpp: In function 'int Query(int, int)':
secret.cpp:91:1: warning: control reaches end of non-void function [-Wreturn-type]
   91 | }
      | ^

• Subtask 1: 100 / 100