Submission #483072

#	Time	Username	Problem	Language	Result	Execution time	Memory
483072		Yazan_Alattar	Secret (JOI14_secret)	C++14	100 / 100	439 ms	9000 KiB

secret

#include <iostream>
#include <fstream>
#include <vector>
#include <cstring>
#include <algorithm>
#include <set>
#include <map>
#include <queue>
#include <list>
#include <utility>
#include <cmath>
#include <numeric>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pb push_back
#define endl "\n"
#define all(x) x.begin(), x.end()
const int M = 2007;
const ll inf = 1e18;
const ll mod = 1e9 + 7;
const double pi = acos(-1);
const int dx[] = {1, 0, -1, 0}, dy[] = {0, 1, 0, -1};
#include "secret.h"
int n, sum[M][M], a[M];

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

int get(int st, int en, int l, int r)
{
    int mid = (l + r) / 2;
    if(en > mid && st <= mid) return Secret(sum[st][mid], sum[mid + 1][en]);
    if(en <= mid) return get(st, en, l, mid);
    return get(st, en, mid + 1, r);
}

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

int Query(int l, int r)
{
    ++l; ++r;
    if(l == r) return a[l];
    return get(l, r, 1, n);
}

// Don't forget special cases. (n = 1?)
// Look for the constraints. (Runtime array? overflow?)

• Subtask 1: 100 / 100