Submission #406449

#	Time	Username	Problem	Language	Result	Execution time	Memory
406449		bonopo	비밀 (JOI14_secret)	C++14	0 / 100	570 ms	4476 KiB

secret

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
#define pb push_back
#define el "\n"
#define f first
#define s second

typedef long long ll;
const ll MM=1e3+5, MOD=1e9+7;
int N, a[MM], pfx[10][MM], sfx[10][MM];

int Secret(int X, int Y);

void build(int l, int r, int lvl) {
    int m=(l+r)/2;
    for(int i=m; i>=l; --i) {
        if(i==m) sfx[lvl][i]=a[i];
        else sfx[lvl][i]=Secret(a[i], sfx[lvl][i+1]); }
    for(int i=m+1; i<=r; ++i) {
        if(i==m+1) pfx[lvl][i]=a[i];
        else pfx[lvl][i]=Secret(a[i], pfx[lvl][i-1]); }
    if(l<r) build(l, m, lvl+1), build(m+1, r, lvl+1);
}

int qry(int l, int r, int ql, int qr, int lvl) {
    int m=(l+r)/2;

    if(ql<=m+1&&qr>=m) {
        int p=(qr==m+0?0:pfx[lvl][qr]);
        int s=(ql==m+1?0:sfx[lvl][ql]);

        if(qr==m+0) return s;
        if(ql==m+1) return p;
        return Secret(p, s);
    }

    if(ql<=m&&qr<=m) return qry(l, m, ql, qr, lvl+1);
    else return qry(m+1, r, ql, qr, lvl+1);
}

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

int Query(int L, int R) {
    return qry(0, N-1, L, R, 0);
}

• Subtask 1: 0 / 100