Submission #1144918

#	Time	Username	Problem	Language	Result	Execution time	Memory
1144918		mingga	Secret (JOI14_secret)	C++20	100 / 100	344 ms	8344 KiB

secret

#include "bits/stdc++.h"
#include "secret.h"

using namespace std;

#define ln "\n"
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
// #define int long long
const int mod = 1e9 + 7;
// const int inf = 2e18;
const int N = 1005;
int n, a[N], f[N][N], b[N];

// int Secret(int x, int y) {
// 	assert(x != -1 and y != -1);
// 	return min(x + 2 * int(y / 2), (int)1e9);
// }

void calc(int l, int r) {
	if(l >= r) return;
	int m = (l + r) >> 1;
	// cout << l << ' ' << r << ' ' << m << ln;
	calc(l, m); calc(m + 1, r);
	f[m][m] = a[m];
	for(int i = m - 1; i >= l; i--) {
		f[i][m] = Secret(a[i], f[i + 1][m]);
	}
	f[m + 1][m + 1] = a[m + 1];
	for(int i = m + 2; i <= r; i++) f[m + 1][i] = Secret(f[m + 1][i - 1], a[i]);
}

void Init(int len, int arr[]) {
	n = len;
	for(int i = 1; i <= n; i++) a[i] = arr[i - 1];
	memset(f, -1, sizeof f);
	for(int i = 1; i <= n; i++) f[i][i] = a[i];
	calc(1, n);
}

int Query(int l, int r) {
	l++, r++;
	if(l == r) return a[l];
	for(int i = l; i <= r; i++) {
		if(f[l][i] != -1 and f[i + 1][r] != -1) {
			// cout << i << ' ' << f[l][i - 1] << ' ' << f[i][r] << ln;
			return Secret(f[l][i], f[i + 1][r]);
		}
	}
}

//Testing
// signed main() {
// 	int n; cin >> n;
// 	for(int i = 0; i < n; i++) {
// 		cin >> b[i];
// 	}
// 	cout << Secret(1, 4) << ' ' << Secret(7, 2) << ln;
// 	Init(n, b);
// 	int q; cin >> q;
// 	for(int i = 1; i <= q; i++) {
// 		int l, r; cin >> l >> r;
// 		int ans = b[l];
// 		for(int i = l + 1; i <= r; i++) ans = Secret(ans, b[i]);
// 		assert(Query(l, r) == ans);
// 		cout << Query(l, r) << ' ' << ans << ln;
// 	}
// }

Compilation message (stderr)

secret.cpp: In function 'int Query(int, int)':
secret.cpp:53:1: warning: control reaches end of non-void function [-Wreturn-type]
   53 | }
      | ^

• Subtask 1: 100 / 100