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Rotate.js
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Rotate.js
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/**
* @param {number[][]} matrix
* @return {void} Do not return anything, modify matrix in-place instead.
*/
const rotate = (matrix) => {
// reverse and transpose
// matrix.reverse();
// for (let i = 0; i < matrix.length; i++) {
// for (let j = 1 + i; j < matrix[i].length; j++) {
// [matrix[i][j], matrix[j][i]] = [matrix[j][i], matrix[i][j]];
// }
// }
const n = matrix.length;
for (let i = 0; i < Math.floor(n / 2); i += 1) {
for (let j = 0; j < n - Math.floor(n / 2); j += 1) {
[matrix[i][j], matrix[j][n - 1 - i]] = [matrix[j][n - 1 - i], matrix[i][j]];
[matrix[i][j], matrix[n - 1 - i][n - 1 - j]] = [matrix[n - 1 - i][n - 1 - j], matrix[i][j]];
[matrix[i][j], matrix[n - 1 - j][i]] = [matrix[n - 1 - j][i], matrix[i][j]];
}
}
};
module.exports = rotate;