Submission #493627

#	Time	Username	Problem	Language	Result	Execution time	Memory
493627		Jeff12345121	Brperm (RMI20_brperm)	C++14	50 / 100	3071 ms	79360 KiB

brperm

#include <bits/stdc++.h>
#include "brperm.h"
using namespace std;



const int nmax = 500005;
int n;
char c[nmax];
int revpre[nmax][20];
int rev(int x, int k) {
    int res = 0,cnt = 0;
    for (int i = k - 1; i >= 0; i--) {
        if (x & (1 << i)) res += (1 << cnt);
        cnt++;
    }
    return res;
}
void init(int N, const char C[]) {
    n = N;
    for (int k = 0; k < 20; k++) {
        for (int i = 0; i < n; i++) {
            revpre[i][k] = rev(i,k);
        }
    }
    for (int i = 0; i < N; i++) {
        c[i] = C[i];
    }
}

int qpre[nmax][20];
int query(int i, int k) {
    if (i + (1 << k) - 1 >= n) return 0;
    if (qpre[i][k] != 0) return qpre[i][k] - 1;

    int limit = i + (1 << k) - 1;
    for (int j = i; j <= limit; j++) {
        if (c[j] != c[revpre[j - i][k] + i]) return (qpre[i][k] = 1) - 1;
    }
    return (qpre[i][k] = 2) - 1;
}

• Subtask 1: 13 / 13
• Subtask 2: 37 / 37
• Subtask 3: 0 / 17
• Subtask 4: 0 / 33