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[LeetCode] 455. Assign Cookies

2020-12-25 10:05:25  阅读:220  来源: 互联网

标签:Cookies 饼干 Assign int 孩子 cookies LeetCode child children


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 <= g.length <= 3 * 104
  • 0 <= s.length <= 3 * 104
  • 1 <= g[i], s[j] <= 231 - 1

分发饼干。

假设你是一位很棒的家长,想要给你的孩子们一些小饼干。但是,每个孩子最多只能给一块饼干。

对每个孩子 i,都有一个胃口值 g[i],这是能让孩子们满足胃口的饼干的最小尺寸;并且每块饼干 j,都有一个尺寸 s[j] 。如果 s[j] >= g[i],我们可以将这个饼干 j 分配给孩子 i ,这个孩子会得到满足。你的目标是尽可能满足越多数量的孩子,并输出这个最大数值。

来源:力扣(LeetCode)
链接:https://leetcode-cn.com/problems/assign-cookies
著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。

思路是two pointer。首先把两个input数组排序,这样需求最小的孩子在前,尺寸最小的饼干也在前。用双指针的方式遍历这两个数组,如果当前饼干能满足当前孩子的需求,则知道有一个孩子的需求被满足了,否则就看下一个饼干是否能满足其需求。饼干遍历完毕的时候,看看有几个孩子的需求能被满足。

时间O(nlogn)

空间O(1)

Java实现

 1 class Solution {
 2     public int findContentChildren(int[] g, int[] s) {
 3         Arrays.sort(g);
 4         Arrays.sort(s);
 5         int i = 0;
 6         int j = 0;
 7         while (i < g.length && j < s.length) {
 8             if (g[i] <= s[j]) {
 9                 i++;
10                 j++;
11             } else {
12                 j++;
13             }
14         }
15         return i;
16     }
17 }

 

LeetCode 题目总结

标签:Cookies,饼干,Assign,int,孩子,cookies,LeetCode,child,children
来源: https://www.cnblogs.com/cnoodle/p/14187481.html

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