Submission #988100

#	Time	Username	Problem	Language	Result	Execution time	Memory
988100		icyalmond	Secret (JOI14_secret)	C++17	0 / 100	356 ms	12208 KiB

secret

#include "secret.h"

int pref[1005][15], suf[1005][15], mask[1005], a[1005];

void build(int l, int r, int h)
{
    if (l == r) suf[l][h] = a[l];
    else
    {
        int m = l + 1 >> 1;
        suf[m][h] = a[m];
        for (int i = m - 1; i >= l; i--) suf[i][h] = Secret(suf[i + 1][h], a[i]);
        pref[m + 1][h] = a[m + 1];
        for (int i = m + 2; i <= r; i++) pref[i][h] = Secret(pref[i - 1][h], a[i]);
        for (int i = m + 1; i <= r; i++) mask[i] |= 1 << h;
        if (l != m) build(l, m, h + 1);
        if (m + 1 != r) build(m + 1, r, h + 1);
    }
}

void Init(int N, int A[])
{
    for (int i = 1; i <= N; i++) a[i] = A[i - 1];
    build(1, N, 0);
}

int Query(int L, int R)
{
    if (L == R) return(a[L + 1]);
    else
    {
        int h = __builtin_ctz(mask[L + 1] ^ mask[R + 1]);
        return(Secret(suf[L + 1][h], pref[R + 1][h]));
    }
}

//coded by icyalmond

Compilation message (stderr)

secret.cpp: In function 'void build(int, int, int)':
secret.cpp:10:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   10 |         int m = l + 1 >> 1;
      |                 ~~^~~

• Subtask 1: 0 / 100