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Count the number of ways to tile the floor of size n x m using 1 x m size tiles in C++
Given two numbers n and m representing the length and breadth of the floor of a room. The goal is to count the number of ways in which this floor can be tiled using the tiles of size 1Xm.
For Example
Input
n=3 m=2
Output
Count the number of ways to tile the floor of size n x m using 1 x m size tiles are: 3
Explanation
The ways will be three 1x2 tiles arranged as shown below −
Input
n=3 m=3
Output
Count the number of ways to tile the floor of size n x m using 1 x m size tiles are: 2
Explanation
The ways will be three 1x3 tiles arranged vertically and horizontally. Only two ways.
Approach used in the below program is as follows −
In this approach we check the value of n. If n is less than m and has value 1 then there will be only one tile to be placed all over the floor of size 1Xm.
If n is equal to m then there will be 2 ways, placing n 1xm tiles all vertically and all horizontally. If n is greater than m then we will calculate ways using previous ways − ways[n−1]+ways[m−1].
Take integers m and n for the dimensions of the floor and tiles.
Function ways_tile_floor(int N, int M) takes the dimensions and returns the number of ways to tile the floor of size n x m using 1 x m size tiles.
Take an array arr[ ] of length N+1 to store count of tiles for index i=current value of N.
For arr[0] tiles will be 0. So arr[0]=0.
Traverse arr[] using for loop from i=1 to i=N. For each arr[i], if i>M then calculate count using previous values. arr[i]=arr[i − 1] + arr[i − M].
In case i=1 and or i<M, set arr[i] with 1.
In case i=M, set arr[i]=2.
At the end of the for loop, arr[N] will have a count of ways of arranging tiles.
Return arr[N] as result.
Example
#include <bits/stdc++.h>
using namespace std;
int ways_tile_floor(int N, int M){
int arr[N + 1];
arr[0] = 0;
for (int i = 1; i <= N; i++){
if (i > M){
arr[i] = arr[i − 1] + arr[i − M];
}
else if (i < M || i == 1){
arr[i] = 1;
} else {
arr[i] = 2;
}
}
return arr[N];
}
int main(){
int n = 3, m = 2;
cout<<"Count the number of ways to tile the floor of size n x m using 1 x m size tiles are: "<<ways_tile_floor(n, m);
return 0;
}Output
If we run the above code it will generate the following output −
Count the number of ways to tile the floor of size n x m using 1 x m size tiles are: 3
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