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Rain water harvesting cpp solution #465

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Rain water harvesting cpp solution #465

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16 changes: 16 additions & 0 deletions leetcode/cpp/Stacks/Rain Water Harvesting
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Original file line number Diff line number Diff line change
@@ -0,0 +1,16 @@
int solve(int n, vector<int> height){
vector<int>prefix(n),suffix(n);
int water = 0;
prefix[0] = height[0];
suffix[n-1] = height[n-1];
for(int i=1;i<n;i++){
prefix[i] = max(prefix[i-1],height[i]);
}
for(int i=n-2;i>=0;i--){
suffix[i] = max(suffix[i+1],height[i]);
}
for(int i=0;i<n;i++){
water += min(prefix[i],suffix[i])-height[i];
}
return water;
}