leetcode_455. Assign Cookies 分配饼干,java数组的排序

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题目:

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 gi, which is the minimum size of a cookie that the child will be content with; and each cookie j has a size sj. If sj >= gi, 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.

Note:
You may assume the greed factor is always positive. 
You cannot assign more than one cookie to one child.

Example 1:

Input: [1,2,3], [1,1]Output: 1Explanation: 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: [1,2], [1,2,3]Output: 2Explanation: 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.

题意:

假设你是一个非常棒的父母,并想给你的孩子一些饼干。 但是,你应该给每个孩子至多一块饼干。 每个孩子i都有一个贪心因子gi,这是孩子将要拥有的饼干的大小的衡量标准; 并且每块饼干 j具有大小sj。 如果sj> = gi,我们可以将饼干j分配给孩子i,孩子i将得到满足。 您的目标是最大化满足您的孩子的数量,并输出最大数量。


代码:

public class Solution {
    public int findContentChildren(int[] g, int[] s) {
        Arrays.sort(g);    //将孩子的欲望从小到大排序
        Arrays.sort(s);    //将饼干的大小从小到大排序
        
        int n = g.length;    //计算孩子个数
        int m = s.length;     //计算饼干数量
        
        int i=0;
        int j=0;
        int res = 0;       //记录得到满足的孩子个数
        
        while(i < n) {      //遍历孩子
            while(j<m) {       //遍历饼干
                if(g[i]<=s[j]){         //有孩子能得到满足
                    res++;            //结果加1
                    i++;             //孩子加1
                    j++;              //饼干加1
                    break;             //跳出当前孩子的饼干遍历,为下一个孩子遍历饼干
                }
                else {             //当前孩子对饼干j不满足,继续遍历下一块饼干
                    j++;
                }
            }
            if(j==m){               //如果饼干遍历完了,则跳出搜索,后面的孩子都得不到满足,不用继续遍历了
                break;
            }
        }
        
        return res;            //返回得到满足的孩子数目
    }
}


笔记:

java的排序函数:

Arrays.sort(g);     默认对int[],double[],char[]类型的数据从小到大升序排序;

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