Submission #606140

#	Time	Username	Problem	Language	Result	Execution time	Memory
606140		kawaii	Secret (JOI14_secret)	C++14	0 / 100	764 ms	8228 KiB

secret

#include "secret.h"
#include<bits/stdc++.h>
using namespace std;
 
int n, a[1005], pre[1005][1005];

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

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

int solve(int l, int r, int lf, int rt){
    if(l == r) return a[l];
    int mid = l + r >> 1;
    if(lf <= mid && mid <= rt){
        if(lf == mid) return pre[mid][rt];
        if(rt == mid) return pre[lf][mid];
        return Secret(pre[lf][mid - 1], pre[mid][rt]);
    }
    if(rt < mid) return solve(l, mid, lf, rt);
    else return solve(mid + 1, r, lf, rt);
}

int Query(int L, int R){
    L++; R++;
    return solve(1, n, L, R);
}

Compilation message (stderr)

secret.cpp: In function 'void dnc(int, int)':
secret.cpp:9:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    9 |     int mid = l + r >> 1;
      |               ~~^~~
secret.cpp: In function 'int solve(int, int, int, int)':
secret.cpp:23:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   23 |     int mid = l + r >> 1;
      |               ~~^~~

• Subtask 1: 0 / 100