Submission #661542

#	Time	Username	Problem	Language	Result	Execution time	Memory
661542		rxlfd314	Secret (JOI14_secret)	C++17	0 / 100	431 ms	8164 KiB

secret

#include "secret.h"
int n, pref[1000][1000];
void precompute(int l, int r, int A[]) {
	int mid = l + r >> 1;
	pref[mid][mid] = A[mid];
	pref[mid+1][mid+1] = A[mid+1];
	for (int i = mid - 1; i >= l; i--) {
		pref[mid][i] = Secret(pref[mid][i+1], A[i]);
	}
	for (int i = mid + 2; i <= r; i++) {
		pref[mid+1][i] = Secret(pref[mid+1][i-1], A[i]);
	}
	if (l < mid) {
		precompute(l, mid, A);
	}
	if (mid + 1 < r) {
		precompute(mid + 1, r, A);
	}
}
void Init(int N, int A[]) {
	n = N;
	precompute(0, N - 1, A);
}
int Query(int L, int R) {
	int lo = 0, hi = n - 1;
	while (lo != hi) {
		int mid = lo + hi >> 1;
		if (L <= mid && mid < R) {
			return Secret(pref[mid][L], pref[mid+1][R]);
		}
		if (R == mid) {
			return pref[mid][L];
		}
		if (mid < L) {
			lo = mid + 1;
		} else {
			hi = mid;
		}
	}
	return pref[lo][lo];
}

Compilation message (stderr)

secret.cpp: In function 'void precompute(int, int, int*)':
secret.cpp:4:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    4 |  int mid = l + r >> 1;
      |            ~~^~~
secret.cpp: In function 'int Query(int, int)':
secret.cpp:27:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   27 |   int mid = lo + hi >> 1;
      |             ~~~^~~~

• Subtask 1: 0 / 100