[Leetcode 135]糖果分配 Candy

【题目】

There are N children standing in a line. Each child is assigned a rating value.

You are giving candies to these children subjected to the following requirements:

• • Each child must have at least one candy.
  • Children with a higher rating get more candies than their neighbors.

What is the minimum candies you must give?

分糖果，【权值大】的人分的糖果比左右多。权值相同，糖果可多可少可相等。

【思路】

新建数组全部初始化1，至少分到一个糖果。

从左到右、从右到左两次遍历数组

【代码】

数组赋值和循环可以改进

最初版本

class Solution {
    public int candy(int[] ratings) {
        int sum=0;
        int []tmp=new int[ratings.length];
        for(int i=0;i<ratings.length;i++){
            tmp[i]=1;
        }
        for(int i=1;i<ratings.length;i++){
            if(ratings[i]>ratings[i-1]){
                tmp[i]=tmp[i-1]+1;
            }
        }
        
        for(int i=ratings.length-2;i>=0;i--){
            if(ratings[i]>ratings[i+1]){
                tmp[i]=Math.max(tmp[i],tmp[i+1]+1);
            }
        }
        for(int i=0;i<tmp.length;i++){
             sum+=tmp[i];
        }
        return sum;
    }
}

【改进】

数组赋值

        for(int i=0;i<ratings.length;i++){
            tmp[i]=1;
        }

等价于

 Arrays.fill(tmp, 1);