双指针法:
int maxArea(vector<int>& height) {
int left=0,right=height.size()-1;
int ans=INT_MIN;
while(left<right)
{
ans=max(ans,min(height[left],height[right])*(right-left));
if(height[left]<height[right])
left++;
else
right--;
}
return ans;
}