Submission #652558

#	Time	Username	Problem	Language	Result	Execution time	Memory
652558		rsjw	Secret (JOI14_secret)	C++17	100 / 100	464 ms	4428 KiB

secret

#include "secret.h"
int n;
int a[5555];
int B[5555];
int f[10][5555];
void divi(int l = 1, int r = n, int rt = 0) {
	if (l == r || l + 1 == r)
		return;
	int m = (l + r) / 2, i;
	f[rt][m] = a[m];
	f[rt][m + 1] = a[m + 1];
	for (i = m - 1; i >= l; i--)
		f[rt][i] = Secret(a[i], f[rt][i + 1]);
	for (i = m + 2; i <= r; i++)
		f[rt][i] = Secret(f[rt][i - 1], a[i]);
	divi(l, m, rt + 1);
	divi(m + 1, r, rt + 1);
}
void Init(int N, int A[]) {
	int i;
	n = N;
	for (i = 0; i < N; i++)
		B[i] = A[i];
	for (int i = 1; i <= n; i++)
		a[i] = A[i - 1];
	divi();
}
int dS(int L, int R, int l = 1, int r = n, int rt = 0) {
	int m = (l + r) / 2, i;
	if (R <= m)
		return dS(L, R, l, m, rt + 1);
	if (L > m)
		return dS(L, R, m + 1, r, rt + 1);
	return rt;
}
int Query(int L, int R) {
	if (L == R)
		return B[L];
	if (L + 1 == R)
		return Secret(B[L], B[L + 1]);
	L++, R++;
	int rt = dS(L, R);
	return Secret(f[rt][L], f[rt][R]);
}

Compilation message (stderr)

secret.cpp: In function 'int dS(int, int, int, int, int)':
secret.cpp:29:23: warning: unused variable 'i' [-Wunused-variable]
   29 |  int m = (l + r) / 2, i;
      |                       ^

• Subtask 1: 100 / 100