【Leetcode】Container With Most Water in JAVA

标签：java   leetcode   

Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i 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.

Note: You may not slant the container.

这道题很暴力的，相当于找到两个“木板”，其中短的那个的高度*两个之间的距离。所以我们的最开始想法就是暴力O(n^2)解法：

int max=0;
        for(int i=0;i<height.length;i++){
        	for(int j=i+1;j<height.length;j++){
        		int area = Math.min(height[i], height[j])*(j-i);
        		if(area>max)	max=area;

1.从两侧往里面找，既然两个木板距离近了，那么必须高度变得更大才有检测价值

2.left>right，right往左找比right高度更大的；同理else ，left往右找比left高度更大的。

3.直到left>=right

好啦，给出代码和main函数

public class ContainerMostWater {
	public static void main(String args[]){
		ContainerMostWater  cw = new 	ContainerMostWater();
		int[] a={2,3,1,5,2,4,8,4,2,9,11,2,4};
		System.out.print(cw.maxArea(a));
	}

	public int maxArea(int[] height) {
		/*
        int max=0;
        for(int i=0;i<height.length;i++){
        	for(int j=i+1;j<height.length;j++){
        		int area = Math.min(height[i], height[j])*(j-i);
        		if(area>max)	max=area;
        	}
        }
        return max;
        */
		int left=0;
		int right=height.length-1;
		int max=0;
		while(left<right){
			int area=Math.min(height[left], height[right])*(right-left);
			if(area>max)	max=area;
			if(height[left]>height[right])	right=findright(height,right);
			else	left=findleft(height,left);
			
		}
		return max;
    }
	private int findright(int[] height,int r){
		for(int i=r-1;i>=0;i--){
			if(height[i]>height[r])	return i;
			
		}
		return 0;
	}
	private int findleft(int[] height,int l){
		for(int i=l+1;i<height.length;i++){
			if(height[i]>height[l])	return i;
		}
		return height.length-1;
	}
}

【Leetcode】Container With Most Water in JAVA

标签：java   leetcode   

原文地址：http://blog.csdn.net/qbt4juik/article/details/41593029