LC 0059 [M] Spiral Matrix II

it's the exact same as Spiral Matrix (I) except you initialize the output at first cause you know the size already and then insert directly into the indexes

class Solution:
    def generateMatrix(self, n: int) -> List[List[int]]:
        output=[[0]*n for _ in range(n)]
        # print(output)
        i = 0
        start_col, start_row,end_col,end_row = 0,0,n,n
        
        while start_col<end_col and start_row<end_row:
            #right
            for c in range(start_col,end_col):
                i+=1
                output[start_row][c]=i
            start_row+=1
            #down
            for r in range(start_row,end_row):
                i+=1
                output[r][end_col-1]=i
            end_col-=1
            #left
            for c in range(end_col-1,start_col-1,-1):
                i+=1
                output[end_row-1][c]=i
            end_row-=1
            #up
            for r in range(end_row-1,start_row-1,-1):
                i+=1
                output[r][start_col]=i
            start_col+=1
            
        return output