Submission #1306904

#	Time	Username	Problem	Language	Result	Execution time	Memory
1306904		mncuchiinhuttt	Secret (JOI14_secret)	C++20	100 / 100	344 ms	8284 KiB

secret

#include "secret.h"
int n;
int dnc[1007][1007];
 
void go(int l, int r, int A[]) {
    int mid = (l + r) >> 1;
    dnc[mid][mid] = A[mid];
    dnc[mid + 1][mid + 1] = A[mid + 1];
    for(int i = mid + 2; i <= r; i++) dnc[mid + 1][i] = Secret(dnc[mid + 1][i - 1], A[i]);
    for(int i = mid - 1; i >= l; i--) dnc[mid][i] = Secret(A[i], dnc[mid][i + 1]);
    if(l < mid) go(l, mid, A);
    if(mid + 1 < r) go(mid + 1, r, A);
}

void Init(int N, int A[]) {
    n = N;
    go(0, n - 1, A);
}

int Query(int L, int R) {
    if(L == R) return dnc[L][L];
    int l = 0, r = n - 1;
    while(l != r) {
        int mid = (l + r) >> 1;
        if(mid >= L and mid < R) {
            return Secret(dnc[mid][L], dnc[mid + 1][R]);
        }
        else if(mid < L) {
            l = mid + 1;
        } else if(R <= mid) {
            r = mid;
        }
    }
} 

Compilation message (stderr)

secret.cpp: In function 'int Query(int, int)':
secret.cpp:34:1: warning: control reaches end of non-void function [-Wreturn-type]
   34 | }
      | ^

• Subtask 1: 100 / 100