Problem:
Score : 200 points

Problem Statement

There are N children, numbered 1, 2, ..., N.

Snuke has decided to distribute x sweets among them.
He needs to give out all the x sweets, but some of the children may get zero sweets.

For each i (1 \leq i \leq N), Child i will be happy if he/she gets exactly a_i sweets.
Snuke is trying to maximize the number of happy children by optimally distributing the sweets.
Find the maximum possible number of happy children.

Constraints

All values in input are integers.

2 \leq N \leq 100

1 \leq x \leq 10^9

1 \leq a_i \leq 10^9

Input

Input is given from Standard Input in the following format:

N x
a_1 a_2 ... a_N

Output

Print the maximum possible number of happy children.

Sample Input 1

3 70
20 30 10

Sample Output 1

2

One optimal way to distribute sweets is (20, 30, 20).

Sample Input 2

3 10
20 30 10

Sample Output 2

1

The optimal way to distribute sweets is (0, 0, 10).

Sample Input 3

4 1111
1 10 100 1000

Sample Output 3

4

The optimal way to distribute sweets is (1, 10, 100, 1000).

Sample Input 4

2 10
20 20

Sample Output 4

0

No children will be happy, no matter how the sweets are distributed.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.io.*;
import java.util.*;

public class Main {

	static class FastScanner {
        BufferedReader br;
        StringTokenizer st;

        public FastScanner() {
            try {
                br = new BufferedReader(new InputStreamReader(System.in));
                st = new StringTokenizer(br.readLine());
            } catch (Exception e){e.printStackTrace();}
        }

        public String next() {
            if (st.hasMoreTokens()) return st.nextToken();
            try {st = new StringTokenizer(br.readLine());}
            catch (Exception e) {e.printStackTrace();}
            return st.nextToken();
        }

        public int nextInt() {return Integer.parseInt(next());}

        public long nextLong() {return Long.parseLong(next());}

        public double nextDouble() {return Double.parseDouble(next());}

        public String nextLine() {
            String line = "";
            if(st.hasMoreTokens()) line = st.nextToken();
            else try {return br.readLine();}catch(IOException e){e.printStackTrace();}
            while(st.hasMoreTokens()) line += " "+st.nextToken();
            return line;
        }
    }

    static class DSU {
        int[] root;
        int[] rank;

        public DSU(int n) {
            root = new int[n];
            rank = new int[n];
            for(int i=0;i<n;i++) {
                root[i] = i;
            }
        }

        public int find(int x) {
            if(root[x] == x) {
                return x;
            }
            else {
                return find(root[x]);
            }
        }

        public void unite(int x, int y) {
            x = find(x);
            y = find(y);
            if(x == y) {
                return;
            }
            if(rank[x] < rank[y]) {
                root[x] = y;
            }
            else {
                root[y] = x;
                if(rank[x] == rank[y]) {
                    rank[x]++;
                }
            }
        }

        public boolean same(int x, int y) {
            return find(x) == find(y);
        }
    }

	public static void main(String[] args) {
        FastScanner sc = new FastScanner();
        PrintWriter pw = new PrintWriter(System.out);

        int n = sc.nextInt();
        long x = sc.nextLong();

        Long[] a = new Long[n];
        for(int i=0;i<n;i++) a[i] = sc.nextLong();

        Arrays.sort(a);

        int ans = 0;
        for(int i=0;i<n;i++) {
            if(x - a[i] >= 0) {
                x -= a[i];
                ans++;
            }
            else {
                break;
            }
        }

        if(x > 0 && ans > 0) {
            ans--;
        }
        
        pw.println(ans);
        pw.close();
    }
}