leecode

    xiaoxiao2021-03-25  117

    https://leetcode.com/problems/container-with-most-water/

    Given n non-negative integers a1a2, ..., an, where each represents a point at coordinate (iai). n vertical lines are drawn such that the two endpoints of line i is at (iai) 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 and n is at least 2.

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    题意:给你一个数组,从a1,a2...an,来描述n个点:(1,a1)、(2,a2)、(i,ai)、(n,an),对每个点画一条线垂直于x轴,任选两条线作为玻璃,问往里面倒水最多能倒多少?

    解答:一开始写了个暴力,结果超时了。后来优化了一下,假设a1为短板,那么要使a1为玻璃,那么要距离它最远的比它长的线,找到即可。

    class Solution { public:     int maxArea(vector<int>& height) {         int size = height.size();         int ans = 0;         for(int i=0;i<size;i++)         {             int l=0,r=size-1;             while(height[i]>height[r])             {                 r--;             }             while(height[i]>height[l])             {                 l++;             }             ans=max(ans,height[i]*(r-i));             ans=max(ans,height[i]*(i-l));         }                  return ans;     }      };

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