Submission #701827

#	Time	Username	Problem	Language	Result	Execution time	Memory
701827		RandomLB	Secret (JOI14_secret)	C++17	100 / 100	463 ms	8224 KiB

secret

#include "secret.h"
#include <bits/stdc++.h>
using namespace std;
//=================================
const int MAX = 1005;
int arr[MAX], res[MAX][MAX], n;

int secret(int a, int b){ return a+b/2*2; }

void solve(int l, int r){
	if (l == r) return;
	int m = l+(r-l)/2;
	res[m][m] = arr[m], res[m+1][m+1] = arr[m+1];
	for (int i = m-1; i >= l; i--) res[i][m] = Secret(arr[i], res[i+1][m]);
	for (int i = m+2; i <= r; i++) res[m+1][i] = Secret(res[m+1][i-1], arr[i]);
	solve(l, m); solve(m+1, r);
}

int solve(int l, int r, int tl, int tr){
	int m = l+(r-l)/2;
	if (tl <= m && m < tr) return Secret(res[tl][m], res[m+1][tr]);
	return (tr <= m? solve(l, m, tl, tr) : solve(m+1, r, tl, tr));
}

void Init(int N, int v[]){
	n = N;
	for (int i = 0; i < n; i++) arr[i] = v[i];
	solve(0, n-1);
}

int Query(int l, int r){
	if (l == r) return arr[l];
	return solve(0, n-1, l, r);
}

• Subtask 1: 100 / 100