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题目:(Greedy)
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:
What is the minimum candies you must give?
题解:
参考引用 http://www.cnblogs.com/springfor/p/3877120.html
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这道题和Trapping water那个是一样的想法,因为无论是水坑还是得到糖的小朋友,影响因素都不只一边,都是左右两边的最小值/最大值来决定的。
所以这道题跟上一道一样,也是左右两边遍历数组。
leftnums数组存从左边遍历,当前小朋友对比其左边小朋友,他能拿到糖的数量;
rightnums数组存从右边遍历,当前小朋友对比其右边小朋友,他能拿到的糖的数量。
最后针对这两个数组,每个小朋友能拿到的糖的数量就是这两个数最大的那个数,求总加和就好了。
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public class Solution { public int candy(int[] ratings) { if(ratings.length==0||ratings==null) return 0; int [] leftMost = new int [ratings.length]; int [] rightMost = new int [ratings.length]; leftMost[0]=1; for(int i=1;i<ratings.length;i++) { if(ratings[i]>ratings[i-1]) leftMost[i]=leftMost[i-1]+1; else leftMost[i]=1; } rightMost[ratings.length-1]=1; for(int i=ratings.length-2; i>=0;i--) { if(ratings[i]>ratings[i+1]) rightMost[i]=rightMost[i+1]+1; else rightMost[i]=1; } int res=0; for(int i=0; i<ratings.length; i++) res+=Math.max(leftMost[i],rightMost[i]); return res; } }
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原文地址:http://www.cnblogs.com/fengmangZoo/p/4185952.html