1 files changed, 54 insertions, 0 deletions
diff --git a/usth/ICT3.4/a51.c b/usth/ICT3.4/a51.c
new file mode 100644
index 0000000..7925f02
--- /dev/null
+++ b/usth/ICT3.4/a51.c
@@ -0,0 +1,54 @@
+#include <stdio.h>
+
+#define READ(t, n) for (int i = 0; i < n; ++i) t = t << 1 | (getchar() ^ 48)
+#define POW2(t) (1 << (t))
+
+#define MAXX POW2(18)
+#define MAXY POW2(21)
+#define MAXZ POW2(22)
+
+#define CLOCKX(x) ((x) & POW2(10))
+#define CLOCKY(y) ((y) & POW2(11))
+#define CLOCKZ(z) ((z) & POW2(12))
+
+#define BIT(n, t) (((t) & POW2(n)) != 0)
+
+#define TAPX(x) ((BIT(0, x) ^ BIT(1, x) ^ BIT(2, x) ^ BIT(5, x)) << 18)
+#define TAPY(y) ((BIT(0, y) ^ BIT(1, y)) << 21)
+#define TAPZ(z) ((BIT(0, z) ^ BIT(1, z) ^ BIT(2, z) ^ BIT(15, z)) << 22)
+
+int main()
+{
+	int x = 0, y = 0, z = 0;
+	READ(x, 19);
+	getchar();  /* assume one-char sep */
+	READ(y, 22);
+	getchar();  /* assume one-char sep */
+	READ(z, 23);
+
+	int n;
+	scanf("%d", &n);
+	while (n--) {
+		int minor = !CLOCKX(x) + !CLOCKY(y) + !CLOCKZ(z) > 1;
+		putchar(((x ^ y ^ z) & 1) + '0');
+
+		if (minor == !CLOCKX(x)) {
+			x >>= 1;
+			x &= ~MAXX;
+			x |= TAPX(x);
+		}
+		if (minor == !CLOCKY(y)) {
+			y >>= 1;
+			y &= ~MAXY;
+			y |= TAPY(y);
+		}
+		if (minor == !CLOCKZ(z)) {
+			z >>= 1;
+			z &= z & ~MAXZ;
+			z |= TAPZ(z);
+		}
+	}
+
+	putchar(10);
+	return 0;
+}