CF990B Micro-World 贪心 第十六

Micro-World

time limit per test

2 seconds

memory limit per test

256 megabytes

input

standard input

output

standard output

You have a Petri dish with bacteria and you are preparing to dive into the harsh micro-world. But, unfortunately, you don't have any microscope nearby, so you can't watch them.

You know that you have $\mathrm{nn bacteria\; in\; the\; Petri\; dish\; and\; size\; of\; the ii-th\; bacteria\; is aiai.\; Also\; you\; know\; intergalactic\; positive\; integer\; constant KK.}$

The $\mathrm{ii-th\; bacteria\; can\; swallow\; the jj-th\; bacteria\; if\; and\; only\; if ai>ajai>aj and ai\le aj+Kai\le aj+K.\; The jj-th\; bacteria\; disappear,\; but\; the ii-th\; bacteria\; doesn\text{'}t\; change\; its\; size.\; The\; bacteria\; can\; perform\; multiple\; swallows.\; On\; each\; swallow\; operation\; any\; bacteria ii can\; swallow\; any\; bacteria jj if ai>ajai>aj and ai\le aj+Kai\le aj+K.\; The\; swallow\; operations\; go\; one\; after\; another.}$

For example, the sequence of bacteria sizes 

Since you don't have a microscope, you can only guess, what the minimal possible number of bacteria can remain in your Petri dish when you finally will find any microscope.

Input

The first line contains two space separated positive integers $\mathrm{nn and KK (1\le n\le 2\cdot 1051\le n\le 2\cdot 105, 1\le K\le 1061\le K\le 106)\; —\; number\; of\; bacteria\; and\; intergalactic\; constant KK.}$

The second line contains $\mathrm{nn space\; separated\; integers a1,a2,\dots ,ana1,a2,\dots ,an (1\le ai\le 1061\le ai\le 106)\; —\; sizes\; of\; bacteria\; you\; have.}$

Output

Print the only integer — minimal possible number of bacteria can remain.

Examples

input

Copy

7 1
101 53 42 102 101 55 54

output

Copy

3

input

Copy

6 5
20 15 10 15 20 25

output

Copy

1

input

Copy

7 1000000
1 1 1 1 1 1 1

output

Copy

7

Note

The first example is clarified in the problem statement.

In the second example an optimal possible sequence of swallows is: 

In the third example no bacteria can swallow any other bacteria.

题意： 有n个细菌，每个细菌的尺寸为ai，现在有以常数k，如果细菌i的尺寸ai大于细菌j的尺寸aj，并且ai<=aj+k,那么细菌i就可以吃掉细菌j，问最后可以剩于多少个细菌。

先将n个细菌去重排序并且用vis数组记录下每个细菌的个数，然后直接暴力枚举满足a[i]>=a[i-1]&&[i]<=a[i-1]+k的情况，减去满足情况a[i-1]的个数

#include <map>
#include <set>
#include <cmath>
#include <queue>
#include <cstdio>
#include <vector>
#include <string>
#include <cstring>
#include <iostream>
#include <algorithm>
#define debug(a) cout << #a << " " << a << endl
using namespace std;
const int maxn = 1e6 + 10;
const int mod = 1e9 + 7;
typedef long long ll;
ll a[maxn], vis[maxn*2], flg[maxn];
int main(){
    std::ios::sync_with_stdio(false);
    ll n, k;
    while( cin >> n >> k ) {
        ll num;
        memset( vis, 0, sizeof(vis) );
        for( ll i = 0; i < n; i ++ ) {
            cin >> a[i];
            vis[a[i]] ++;
        }
        sort( a, a + n );
        ll sum = n, len = unique( a, a + n ) - a;
        for( ll i = 1; i < len; i ++ ) {
            if( a[i] > a[i-1] && a[i] <= a[i-1] + k ) {
                sum -= vis[a[i-1]];
            }
        }
        cout << sum << endl;
    }
    return 0;
}