【Leetcode】455. Assign Cookies（贪心思想）

骑猪看日落 2021-11-24 02:18 222阅读 0赞

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: 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: [1,2], [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.

题目大意：

给出孩子满意的最小大小g，给出饼干的大小s。求出最多能够满足的孩子数量。

解题思路：

将两个vector进行排序。从s的左边开始，如果g满足当前的s，则g++，s++，否则s++

class Solution {
    public:
        int findContentChildren(vector<int>& g, vector<int>& s) {
            sort(g.begin(), g.end());
            sort(s.begin(), s.end());
            int g_idx = 0;
            int s_idx = 0;
            while(s_idx<s.size() && g_idx<g.size()){
                if( g[g_idx]<=s[s_idx] ){
                    g_idx++;
                    s_idx++;
                }else{
                    s_idx++;
                }
                
            }
            return g_idx;
        }
    };