제출 #661527

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
661527		rxlfd314	Secret (JOI14_secret)	C++17	0 / 100	425 ms	8308 KiB

secret

#include "secret.h"
constexpr int mxN = 1005;
int N, pref[mxN][mxN];
void precompute(int l, int r, int A[]) {
	if (l == r) return;
	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]);
	}
	precompute(l, mid, A);
	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];
}

컴파일 시 표준 에러 (stderr) 메시지

secret.cpp: In function 'void precompute(int, int, int*)':
secret.cpp:6:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    6 |  int mid = l + r >> 1;
      |            ~~^~~
secret.cpp: In function 'int Query(int, int)':
secret.cpp:25:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   25 |   int mid = lo + hi >> 1;
      |             ~~~^~~~

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