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Create 42TrappingRainWater.cpp #175

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36 changes: 36 additions & 0 deletions Solutions/42TrappingRainWater.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,36 @@
class Solution {
public:
int trap(vector<int>& height) {
int n = height.size();
int lmax = height[0];
int rmax = height[n-1];
int lpos = 1;
int rpos = n-2;
int water = 0;
while(lpos <= rpos)
{
if(height[lpos] >= lmax)
{
lmax = height[lpos];
lpos++;
}
else if(height[rpos] >= rmax)
{
rmax = height[rpos];
rpos--;
}
else if(lmax <= rmax && height[lpos] < lmax)
{
water += lmax - height[lpos];
lpos++;
}
else
{
water += rmax - height[rpos];
rpos--;
}

}
return water;
}
};