Submission #639175

#	Time	Username	Problem	Language	Result	Execution time	Memory
639175		phoenix	Secret (JOI14_secret)	C++17	100 / 100	449 ms	4416 KiB

secret

#include<bits/stdc++.h>
#include "secret.h"

using namespace std;

const int N = 1000;
const int logN = 11;

int lef[ N ][ logN ], rig[ N ][ logN ];
void build(int l, int r, int lev, int a[]) {
    if(l == r) {
        lef[ l ][ lev ] = a[ l ];
        rig[ r ][ lev ] = a[ r ];
        return;
    }
    int m = (l + r) / 2;

    for(int i = m + 1;i <= r;i++) {
        if(i == m + 1) rig[ i ][ lev ] = a[ i ];
        else rig[ i ][ lev ] = Secret(rig[i - 1][ lev ], a[ i ]);
    }

    for(int i = m;i >= l;i--) {
        if(i == m) lef[ i ][ lev ] = a[ i ];
        else lef[ i ][ lev ] = Secret(a[ i ], lef[i + 1][ lev ]);
    }
    build(l, m, lev + 1, a);
    build(m + 1, r, lev + 1, a);

}

int query(int ql, int qr, int l, int r, int lev) {
    if(l == r) 
        return lef[ l ][ lev ];
    int m = (l + r) / 2;

    if(ql <= m && m < qr) {
        return Secret(lef[ ql ][ lev ], rig[ qr ][ lev ]); 
    }
    if(qr <= m)
        return query(ql, qr, l, m, lev + 1);
    return query(ql, qr, m + 1, r, lev + 1);
}
int n;
void Init(int nn, int a[]) {
    n = nn;
    build(0, n - 1, 0, a);
}

int Query(int l, int r) {
    return query(l, r, 0, n - 1, 0);
}

• Subtask 1: 100 / 100