Container With Most Water水箱问题
来源:互联网 发布:电脑版扫描软件 编辑:程序博客网 时间:2024/04/28 09:29
Given n non-negative integersa1, a2, ...,an, where each represents a point at coordinate (i,ai). n vertical lines are drawn such that the two endpoints of linei is at (i,ai) and (i, 0). Find two lines, which together with x-axis forms a container, such that the container contains the most water.
这题就是要寻找到两个直线,中间的容积最大,容器的宽度就是下标 之差,高度取最短的那个直线:
对于ai,aj,其中i<j,求max (min(ai,aj))*(j-i)
看到题目第一下马上想到的就是暴力求解法:
<span style="font-size:14px;">class Solution {public: int my_min(int a,int b) { return a<b?a:b; } int maxArea(vector<int>& height) { int L = height.size(); int result = 0; for(int i =0;i<L-1;i++) { if(height[i]*(L-1-i)<=result)//剪枝 continue; for(int j = i+1;j < L;j++) { result = (my_min(height[i],height[j])*(j-i))>result?(my_min(height[i],height[j])*(j-i)):result; } } return result; }};</span>当然不用想也知道肯定超时。果然那句话:第一个想到的方法往往不是最好的方法。
这时换一个思路:
对于影响结果的几个因素,第一就是宽度,第二就是高度。暴力求解就是从宽度出发,假设只要宽度变宽都是有可能达到最优解的。但是现实中有这样这这样的可能,往后高度越来越小,但是这种情况下还是不能排除某些数据。
如果从高度来讲,最小的高度将影响结果,那我们每一次都调整最短的那个距离。
class Solution {public: inline int my_min(int a,int b) { return a<b?a:b; } int maxArea(vector<int>& height) { int L = height.size(); int head = 0; int rear = L-1; int result = 0; while(head < rear) { result = (my_min(height[head],height[rear])*(rear-head)>result)?(my_min(height[head],height[rear])*(rear-head)):result; if(height[head] <= height[rear]) { ++head; } else { --rear; } } return result; }};
提交运行成功。
0 0
- Container With Most Water水箱问题
- Container With Most Water
- Container with most water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- Container With Most Water
- 第十五期 MIPS汇编U-Boot从start.S开始《路由器就是开发板》
- Android之SurfaceView使用总结
- Mongodb创建collection
- 被python坑怕了,怀念java
- SpringSecurity实现登录认证及权限验证
- Container With Most Water水箱问题
- 事件的委托
- 2016 中国互联网仿冒态势分析报告
- Android组件08—拖动条SeekBar和RatingBar
- oracle导入、导出dmp文件
- Hello Guice
- Unity插件 - MeshEditor(七)变形动画骨骼及蒙皮
- iOS开发之<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0”/>
- 树形结构的数据库表Schema设计