455. Assign Cookies

package LeetCode_455

/**
 * 455. Assign Cookies
 * https://leetcode.com/problems/assign-cookies/
 * Assume you are an awesome parent and want to give your children some cookies.
 * But, you should give each child at most one cookie.
Each child i has a greed factor g[i], which is the minimum size of a cookie that the child will be content with; and each cookie j has a size s[j].
If s[j] >= g[i], we can assign the cookie j to the child i, and the child i will be content.
Your goal is to maximize the number of your content children and output the maximum number.

Example 1:
Input: g = [1,2,3], s = [1,1]
Output: 1
Explanation: You have 3 children and 2 cookies. The greed factors of 3 children are 1, 2, 3.
And even though you have 2 cookies, since their size is both 1, you could only make the child whose greed factor is 1 content.
You need to output 1.

Example 2:
Input: g = [1,2], s = [1,2,3]
Output: 2
Explanation: You have 2 children and 3 cookies. The greed factors of 2 children are 1, 2.
You have 3 cookies and their sizes are big enough to gratify all of the children,
You need to output 2.

Constraints:
1. 1 <= g.length <= 3 * 10^4
2. 0 <= s.length <= 3 * 10^4
3. 1 <= g[i], s[j] <= 231 - 1
 * */
class Solution {
    /**
     * solution: Greedy, Time:O(nlogn), Space:O(1)
     * */
    fun findContentChildren(g: IntArray, s: IntArray): Int {
        val childrenCount = g.size
        val cookiesCount = s.size
        g.sort()//nlogn
        s.sort()
        var result = 0
        var i = 0
        var j = 0
        while (i < childrenCount && j < cookiesCount) {
            if (g[i] <= s[j]) {
                result++
                //Assigned one, then got to assign to next child
                i++
                j++
            } else {
                //keep to find out next big cookies
                j++
            }
        }
        return result
    }
}