Trapping Rain Water
浏览数：27 /
时间：2015年06月11日
Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.
1 class Solution { 2 public: 3 int trap(int A[], int n) { 4 vector<int> max_left(n,0); 5 vector<int> max_right(n,0); 6 int sum = 0; 7 for(int i = 1; i < n; i++){ 8 max_left[i] = max(max_left[i-1], A[i-1]); 9 max_right[n-1-i] = max(max_right[n-i],A[n-i]); 10 } 11 for(int i = 1; i < n-1; i++){ 12 int height = min(max_left[i],max_right[i]); 13 if(height > A[i]) 14 sum += height - A[i]; 15 } 16 return sum; 17 } 18 };
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