Tell us what’s happening:
I am trying to make 3 different cases to determine what the max of 4 elements multiplied by each other could be. First I am trying to iterate through the rows and get the max of that, Then columns and lastly diagonally. I pushed the 3 values into an array to see if all 3 cases were calculating different values to check for mistakes. Then I returned the max of that array. Still getting the wrong answer, can you inspect my code? Looking for feedback on if I may have constructed the for loops incorrectly. Thanks.
Your code so far
function largestGridProduct(arr) {
//initial variable
let maxHorizontal = 0;
let maxVertical = 0;
let maxDiag = 0;
let arrOfMax = []
//get the max in the horizontal direction
for (let i = 0; i < arr.length; i++) {
for (let j = 0; j + 3 < arr.length; j++) {
let temp = arr[i][j] * arr[i][j + 1] * arr[i][j + 2] * arr[i][j + 3]
if (temp > maxHorizontal) {
maxHorizontal = temp
}
}
}
//keep track of the maxes in different directions
arrOfMax.push(maxHorizontal)
//get the max in the vertical direction
for (let i = 0; i + 3 < arr.length; i++) {
for (let j = 0; j < arr.length; j++) {
let temp = arr[i][j] * arr[i + 1][j] * arr[i + 2][j] * arr[i + 3][j]
if (temp > maxVertical) {
maxVertical = temp
}
}
}
arrOfMax.push(maxVertical)
//get the max of the diagonals
for (let i = 0; i + 3 < arr.length; i++) {
for (let j = 0; j + 3 < arr.length; j++) {
let temp = arr[i][j] * arr[i + 1][j + 1] * arr[i + 2][j + 2] * arr[i + 3][j + 3]
if (temp > maxDiag) {
maxDiag = temp
}
}
}
arrOfMax.push(maxDiag)
var max = Math.max(...arrOfMax);
// Good luck!
return max
}
// Only change code above this line
const grid = [
[8, 2, 22, 97, 38, 15, 0, 40, 0, 75, 4, 5, 7, 78, 52, 12, 50, 77, 91, 8],
[49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62, 0],
[81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36, 65],
[52, 70, 95, 23, 4, 60, 11, 42, 69, 24, 68, 56, 1, 32, 56, 71, 37, 2, 36, 91],
[22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80],
[24, 47, 32, 60, 99, 3, 45, 2, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12, 50],
[32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70],
[67, 26, 20, 68, 2, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94, 21],
[24, 55, 58, 5, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72],
[21, 36, 23, 9, 75, 0, 76, 44, 20, 45, 35, 14, 0, 61, 33, 97, 34, 31, 33, 95],
[78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 3, 80, 4, 62, 16, 14, 9, 53, 56, 92],
[16, 39, 5, 42, 96, 35, 31, 47, 55, 58, 88, 24, 0, 17, 54, 24, 36, 29, 85, 57],
[86, 56, 0, 48, 35, 71, 89, 7, 5, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58],
[19, 80, 81, 68, 5, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 4, 89, 55, 40],
[4, 52, 8, 83, 97, 35, 99, 16, 7, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66],
[88, 36, 68, 87, 57, 62, 20, 72, 3, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69],
[4, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76, 36],
[20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 4, 36, 16],
[20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54],
[1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48]
];
const testGrid = [
[40, 17, 81, 18, 57],
[74, 4, 36, 16, 29],
[36, 42, 69, 73, 45],
[51, 54, 69, 16, 92],
[7, 97, 57, 32, 16]
];
console.log(largestGridProduct(testGrid));
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Challenge: Problem 11: Largest product in a grid
Link to the challenge:
https://www.freecodecamp.org/learn/coding-interview-prep/project-euler/problem-11-largest-product-in-a-grid