【greedy】LeetCode----455. Assign Cookies

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.

C++求解过程

class Solution {public:    int findContentChildren(vector<int>& g, vector<int>& s) {        //先排序        sort(g.begin(), g.end());        sort(s.begin(), s.end());                int ans = 0;                //贪心算法：为每个child匹配当前情况下满足条件size最小的cookie        //遍历，并在有序队列中找到第一个满足条件的cookie        for(int i = 0, j = 0; i < s.size() && j < g.size(); i++)             if(s[i] >= g[j]) {                ans++;                j++;            }        return ans;    }};