Submission #320390

#	Time	Username	Problem	Language	Result	Execution time	Memory
320390		ryangohca	Secret (JOI14_secret)	C++17	100 / 100	562 ms	8440 KiB

secret

#include "secret.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> nums;
int stored[1001][1001];
void dnc(int l, int r){
    if (l == r) return;
    if (r - l == 1){
        if (stored[l][r] != -1) return;
        stored[l][r] = Secret(nums[l], nums[r]);
        return;
    }
    int mid = (l + r) / 2;
    int accum = (stored[mid - 1][mid] == -1 ? Secret(nums[mid - 1], nums[mid]) : stored[mid - 1][mid]);
    stored[mid - 1][mid] = accum;
    for (int i = mid - 2; i >= l; i--){
        if (stored[i][mid] != -1) accum = stored[i][mid];
        else stored[i][mid] = accum = Secret(nums[i], accum);
    }
    mid++;
    accum = (stored[mid][mid + 1] == -1 ? Secret(nums[mid], nums[mid + 1]) : stored[mid][mid + 1]);
    stored[mid][mid + 1] = accum;
    for (int i = mid + 2; i <= r; i++){
        if (stored[mid][i] != -1) accum = stored[mid][i];
        else stored[mid][i] = accum = Secret(accum, nums[i]);
    }
    mid--;
    dnc(l, mid);
    dnc(mid, r);
}
void Init(int N, int A[]) {
    memset(stored, -1, sizeof stored);
    for (int i = 0; i < N; i++){
        nums.push_back(A[i]);
        stored[i][i] = A[i];
    }
    dnc(0, N - 1);
}
 
int Query(int L, int R) {
    if (L == R) return nums[L];
    if (R - L == 1) return Secret(nums[L], nums[R]);
    for (int i = L; i < R; i++){
        if (stored[L][i] != -1 && stored[i + 1][R] != -1) return Secret(stored[L][i], stored[i + 1][R]);
    }
    return stored[L][R];
}

• Subtask 1: 100 / 100