Print matrix in zigzag format

An algorithm to print the the given matrix in zigzag format.

We will loop through the given matrix in the zigzag format in Javascript and print it.

Example

Input:
 1 2 3 4 
 5 6 7 8
 9 0 1 2

Output:
1
2
3
4
8
7
6
5
9
0
1
2

Implementation

• We will loop through the given array and check if the current row is odd or even.
• If the current row is odd then we will print it in reverse direction(last to first) else we will print in normal direction(first to last).
• We will use ES6 to code.

 let zigzagMatrix = (arr) => {
 //loop through the array
 for(let i = 0; i < arr.length; i++){
   
   if( i % 2 != 0){

     //If it is odd row then print in reverse direction
     for(let j = arr[i].length - 1; j >= 0; j--){
      console.log(arr[i][j]);
     }
    }else{

    //If it is even row then print in normal direction
    for(let j = 0; j < arr[i].length;  j++){
      console.log(arr[i][j]);
     }
    }
   }
 }

Input:
zigzagMatrix([[1, 2, 3, 4],[5, 6, 7, 8], [9, 0, 1, 2]]);

Output:
1
2
3
4
8
7
6
5
9
0
1
2

Time complexity: O(m * n).

Space complexity: O(1).

Time and Space complexity

• We are looping through 2d array which can have m columns and n rows, so Time complexity is O(m * n).
• We are using constant space, so Space complexity is O(1).