Created
March 6, 2019 10:15
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public class Rotate { | |
public static int[][] rotateImage(int[][] a) { | |
final int len = a.length; | |
println("LEN: " + len / 2); | |
println("========"); | |
for (int s = 0; s < len / 2; s++) { | |
println("S: " + s); | |
for (int i = 0; i < len - 2 * s - 1; i++) { | |
int temp = a[s][s + i]; | |
println(String.format("temp = a[%s][%s]", s, s + i)); | |
a[s][s + i] = a[len - s - i - 1][s]; | |
printD(s, s + i, len - s - i - 1, s, a[s][s + i], a[len - s - i - 1][s]); | |
a[len - s - i - 1][s] = a[len - s - 1][len - s - i - 1]; | |
printD(len - s - i - 1, s, len - s - 1, len - s - i - 1, a[len - s - i - 1][s], a[len - s - 1][len - s - i - 1]); | |
a[len - s - 1][len - s - i - 1] = a[s + i][len - s - 1]; | |
printD(len - s - 1, len - s - i - 1, s + i, len - s - 1, a[len - s - 1][len - s - i - 1], a[s + i][len - s - 1]); | |
a[s + i][len - s - 1] = temp; | |
println(String.format("a[%s][%s] = temp\n%s = %s", s + 1, len - s - 1, a[s + i][len - s - 1], temp)); | |
print(a); | |
println("========"); | |
} | |
println("========"); | |
} | |
return a; | |
} | |
private static void printD(int y1, int x1, int y2, int x2, int c, int d) { | |
println(String.format("a[%s][%s] = a[%s][%s]\n%s = %s\n", y1, x1, y2, x2, c, d)); | |
} | |
private static void println(String m) { | |
System.out.println(m); | |
} | |
private static void print(int[][] a) { | |
for (int[] y: a) { | |
for (int x: y) { | |
System.out.print(x + " "); | |
} | |
System.out.print("\n"); | |
} | |
System.out.print("\n"); | |
} | |
} |
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just to understand matrix rotation