Leetcode.11 Container with Most Water
问题描述:
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 and n is at least 2.
我的思路:
寻找两条边,这两条边满足这样的条件:两条边和x轴围成的容器能够容纳最多的水,返回最大的容水量。
最大的容水量会受最短的边的限制,所以我们可以从x轴最长开始,即坐标为0, 和坐标为vector.size()-1之间围成的容器,选择最短的边移动,因为长的边会给我们提供更大的余地。
容量的计算为: (right - left) * min(height[left], height[right])
时间复杂度为O(n)
代码:
class Solution { public: int maxArea(vector<int>& height) { int left = 0; int right = height.size() - 1; int maxC = 0; while(left < right){ int curShort = height[left]; int curDis = right - left; if(height[left] < height[right]){ curShort = height[left]; left++; }else{ curShort = height[right]; right--; } int curC = curDis * curShort; maxC = max(maxC, curC); } return maxC; } };