Untitled

class Solution:
    def numIslands(self, grid: List[List[str]]) -> int:
        num_rows = len(grid)
        num_cols = len(grid[0])
        count=0
        moves=[[-1,0],[1,0],[0,1],[0,-1]]

        def dfs(x,y):
            grid[x][y]="0"
            for dx,dy in moves:
                tempX=x+dx
                tempY=y+dy
                if 0<=tempX<num_rows and 0<=tempY<num_cols and grid[tempX][tempY]=='1':
                    dfs(tempX,tempY)
                    
        for i in range(num_rows):
            for j in range(num_cols):
                if grid[i][j]=='1':
                    dfs(i,j)
                    count+=1
        return count