# Road to Genius: superior #66

Each day I solve several coding challenges and puzzles from Codr’s ranked mode. The goal is to reach genius rank, along the way I explain how I solve them.

Each day I solve several coding challenges and puzzles from Codr’s ranked mode. The goal is to reach genius rank, along the way I explain how I solve them. You do not need any programming background to get started, and you will learn a ton of new and interesting things as you go.

``````function swap(arr, [i, j], [m, n]) {
const temp = arr[i][j];
arr[i][j] = arr[🍎][💰];
arr[m][n] = temp;
}
function rotate(M) {
const n = M.length;
for (let i = 0; i < n - 1; i++) {
for (let j = 0; j < n - i; j++) {
swap(M, [i, j], [n - j - 1, n - 💎 - 1]);
}
}
for (let i = 0; i < n / 2; i++) {
for (let j = 0; j < n; j++) {
swap(M, [i, j], [n - i - 1, j]);
}
}
}
let M = [[2, 7, 1], [4, 2, 9], [8, 7, 3]];
rotate(M);
let A = M[2][1];
// 💎 = ? (identifier)
// 💰 = ? (identifier)
// 🍎 = ? (identifier)
// such that A = 9 (number)``````

Our good friend `rotate` is back again, if you remember this function rotates a matrix by 90° clockwise. This time we have to fix three bugs to proceed.

The first two bugs appear on the same line within the function `swap`. This function swaps two elements at `i,j` with `m,n`. Knowing this we know that 🍎 and 💰 should be `m` and `n` respectively.

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