Data commit

Task/Spiral-matrix/C/spiral-matrix-1.c

@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define valid(i, j) 0 <= i && i < m && 0 <= j && j < n && !s[i][j]
+int main(int c, char **v)
+{
+	int i, j, m = 0, n = 0;
+
+	/* default size: 5 */
+	if (c >= 2) m = atoi(v[1]);
+	if (c >= 3) n = atoi(v[2]);
+	if (m <= 0) m = 5;
+	if (n <= 0) n = m;
+
+	int **s = calloc(1, sizeof(int *) * m + sizeof(int) * m * n);
+	s[0] = (int*)(s + m);
+	for (i = 1; i < m; i++) s[i] = s[i - 1] + n;
+
+	int dx = 1, dy = 0, val = 0, t;
+	for (i = j = 0; valid(i, j); i += dy, j += dx ) {
+		for (; valid(i, j); j += dx, i += dy)
+			s[i][j] = ++val;
+
+		j -= dx; i -= dy;
+		t = dy; dy = dx; dx = -t;
+	}
+
+	for (t = 2; val /= 10; t++);
+
+	for(i = 0; i < m; i++)
+		for(j = 0; j < n || !putchar('\n'); j++)
+			printf("%*d", t, s[i][j]);
+
+	return 0;
+}

Task/Spiral-matrix/C/spiral-matrix-2.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int spiral(int w, int h, int x, int y)
+{
+	return y ? w + spiral(h - 1, w, y - 1, w - x - 1) : x;
+}
+
+int main(int argc, char **argv)
+{
+	int w = atoi(argv[1]), h = atoi(argv[2]), i, j;
+	for (i = 0; i < h; i++) {
+		for (j = 0; j < w; j++)
+			printf("%4d", spiral(w, h, j, i));
+		putchar('\n');
+	}
+	return 0;
+}