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rotate-image.ts
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rotate-image.ts
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export function rotate(matrix: number[][]): void {
let n = matrix.length;
for (let i = 0; i < n - 1; ++i) {
for (let j = i; j < n - 1 - i; ++j) {
let tmp = matrix[i][j];
matrix[i][j] = matrix[n - 1 - j][i];
matrix[n - 1 - j][i] = matrix[n - 1 - i][n - 1 - j];
matrix[n - 1 - i][n - 1 - j] = matrix[j][n - 1 - i];
matrix[j][n - 1 - i] = tmp;
}
}
}
/*
+---+
| x |
+---+
+---+---+
| x | |
+---+---+
| | |
+---+---+
+---+---+---+
| x | x | |
+---+---+---+
| | x | |
+---+---+---+
| | | |
+---+---+---+
+---+---+---+---+
| x | x | x | |
+---+---+---+---+
| | x | | |
+---+---+---+---+
| | | | |
+---+---+---+---+
| | | | |
+---+---+---+---+
+---+---+---+---+---+
| x | x | x | x | |
+---+---+---+---+---+
| | x | x | | |
+---+---+---+---+---+
| | | x | | |
+---+---+---+---+---+
| | | | | |
+---+---+---+---+---+
| | | | | |
+---+---+---+---+---+
*/