javascript

`let max= -63

for(let i=0; i<arr.length-2; i++){
    for(let j=0; j<arr.length-2; j++){

        let top = arr[i][j] + arr[i][j+1] + arr[i][j+2]
        let mid = arr[i+1][j+1]
        let bot = arr[i+2][j] + arr[i+2][j+1] + arr[i+2][j+2]
        let currSum = top + mid + bot
        max = Math.max(max, currSum)

    }
}

console.log(max)`