Medium Accuracy: 50.0%
Submissions: 11692 Points: 4
Given N, the number of plots on either sides of the road. Find the total ways to construct buildings in the plots such that there is a space between any 2 buildings. All plots on one side of the road are continuous.
Lets suppose * represents a plot, then for N=3, the plots can be represented as * * * | | * * *
Where | | represents the road.
Note: As the answer can be very large, print it mod 1000000007
Example 1:
Input: N = 3
Output: 25
Explanation: 3 plots, which means possible
ways for one side are BSS, BSB, SSS, SBS,
SSB where B represents a building and S
represents an empty space Total possible
ways are 25, because a way to place on one
side can correspond to any of 5 ways on other
side.
Example 2:
Input: N = 10
Output: 20736
Explanation: There are 20736 ways for N = 10.
Your Task:
You don't need to read or print anything. Your task is to complete the function TotalWays() which takes N as input parameter and returns the total possible ways modulo 109 + 7.
Expected Time Complexity: O(N) Expected Space Complexity: O(N)
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Avoid using static/global variables in coding problems as your code is tested
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Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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