#P3618. Exploration

    ID: 2619 传统题 1000ms 256MiB 尝试: 4 已通过: 1 难度: 4 上传者: 标签>贪心其他排序难度普及/提高-USACO 2007 November Bronze

Exploration

Description

Bessie is traveling on a road teeming with interesting landmarks. The road is labeled just like a number line, and Bessie starts at the "origin" (x = 0). A total of N (1 ≤ N ≤ 50,000) landmarks are located at points x1, x2, ..., xN (-100,000 ≤ xi ≤ 100,000). Bessie wants to visit as many landmarks as possible before sundown, which occurs in T (1 ≤ T ≤ 1,000,000,000) minutes. She travels 1 distance unit in 1 minute.

Bessie will visit the landmarks in a particular order. Since the landmarks closer to the origin are more important to Farmer John, she always heads for the unvisited landmark closest to the origin. No two landmarks will be the same distance away from the origin.

Help Bessie determine the maximum number of landmarks she can visit before the day ends.

Input

* Line 1: Two space-separated integers: T and N
* Lines 2..N+1: Line i+1 contains a single integer that is the location of the ith landmark: xi

Output

* Line 1: The maximum number of landmarks Bessie can visit.

25 5
10
-3
8
-7
1
4

Source

USACO 2007 November Bronze