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Solution to rain water trapping problem leetcode #3

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Solution to rain water trapping problem leetcode #3

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44 changes: 44 additions & 0 deletions Interview/Trapping Rain Water.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,44 @@
class Solution {
public:
int trap(vector<int>& height) {
int prevMaxHeight, result = 0, curResult = 0, peakIndex;

prevMaxHeight = 0;

for(int i = 1; i < height.size(); i++)
{
if(height[i] < height[prevMaxHeight])
{
curResult += (height[prevMaxHeight] - height[i]);
}

else
{
result += curResult;
curResult = 0;
prevMaxHeight = i;
}
}

peakIndex = prevMaxHeight;
prevMaxHeight = height.size() - 1;
curResult = 0;

for(int i = height.size() - 2; i >= peakIndex; i--)
{
if(height[i] < height[prevMaxHeight])
{
curResult += (height[prevMaxHeight] - height[i]);
}

else
{
result += curResult;
curResult = 0;
prevMaxHeight = i;
}
}

return result;
}
};