Submission #881971

#	Time	Username	Problem	Language	Result	Execution time	Memory
881971		Alan	Secret (JOI14_secret)	C++17	0 / 100	376 ms	8288 KiB

secret

#include <bits/stdc++.h>
using namespace std;

int Secret(int X, int Y);

int ans[1005][1005], N;

void calc (int l, int r) {
	if (l == r) return;
	int mid = (l+r)/2;
	for (int i = mid-1; i >= l; i--) if (ans[i][mid] == -1) ans[i][mid] = Secret(i, mid);
	for (int i = mid+2; i <= r; i++) if (ans[mid+1][i] == -1) ans[mid+1][i] = Secret(mid+1, i);
	calc(l, mid);
	calc(mid+1, r);
}

void Init (int n, int A[]) {
	N = n;
	for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) ans[i][j] = -1;
	for (int i = 0; i < n; i++) ans[i][i] = A[i];
	calc(0, n-1);
}

int solve (int l, int r, int ql, int qr) {
	int mid = (l+r)/2;
	if (qr <= mid) return solve(l, mid, ql, qr);
	if (mid+1 <= l) return solve(mid+1, r, ql, qr);
	return Secret(ans[ql][mid], ans[mid+1][qr]);
}

int Query (int L, int R) {
	if (ans[L][R] != -1) return ans[L][R];
	return solve(0, N-1, L, R);
}

• Subtask 1: 0 / 100