Submission #54501

#	Time	Username	Problem	Language	Result	Execution time	Memory
54501		ikura355	Secret (JOI14_secret)	C++14	100 / 100	641 ms	9676 KiB

secret

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

const int maxn = 1e3 + 5;

int n;
int a[maxn];
int rec[maxn][maxn];

void prep(int l, int r) {
    if(l==r) return ;
    int mid = (l+r)/2;
    rec[mid][mid] = a[mid];
    for(int i=mid-1;i>=l;i--) rec[i][mid] = Secret(a[i], rec[i+1][mid]);
    rec[mid+1][mid+1] = a[mid+1];
    for(int i=mid+2;i<=r;i++) rec[mid+1][i] = Secret(rec[mid+1][i-1], a[i]);
    prep(l,mid); prep(mid+1,r);
}

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

int Query(int L, int R) {
    L++; R++;
    if(rec[L][R]!=-1) return rec[L][R];
    for(int i=L;i<R;i++) {
        if(rec[L][i]!=-1 && rec[i+1][R]!=-1) {
            return Secret(rec[L][i], rec[i+1][R]);
        }
    }
}

Compilation message (stderr)

secret.cpp: In function 'int Query(int, int)':
secret.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

• Subtask 1: 100 / 100