Data commit

Task/Intersecting-number-wheels/C/intersecting-number-wheels.c

@@ -0,0 +1,141 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct Wheel {
+    char *seq;
+    int len;
+    int pos;
+};
+
+struct Wheel *create(char *seq) {
+    struct Wheel *w = malloc(sizeof(struct Wheel));
+    if (w == NULL) {
+        return NULL;
+    }
+
+    w->seq = seq;
+    w->len = strlen(seq);
+    w->pos = 0;
+
+    return w;
+}
+
+char cycle(struct Wheel *w) {
+    char c = w->seq[w->pos];
+    w->pos = (w->pos + 1) % w->len;
+    return c;
+}
+
+struct Map {
+    struct Wheel *v;
+    struct Map *next;
+    char k;
+};
+
+struct Map *insert(char k, struct Wheel *v, struct Map *head) {
+    struct Map *m = malloc(sizeof(struct Map));
+    if (m == NULL) {
+        return NULL;
+    }
+
+    m->k = k;
+    m->v = v;
+    m->next = head;
+
+    return m;
+}
+
+struct Wheel *find(char k, struct Map *m) {
+    struct Map *ptr = m;
+
+    while (ptr != NULL) {
+        if (ptr->k == k) {
+            return ptr->v;
+        }
+        ptr = ptr->next;
+    }
+
+    return NULL;
+}
+
+void printOne(char k, struct Map *m) {
+    struct Wheel *w = find(k, m);
+    char c;
+
+    if (w == NULL) {
+        printf("Missing the wheel for: %c\n", k);
+        exit(1);
+    }
+
+    c = cycle(w);
+    if ('0' <= c && c <= '9') {
+        printf(" %c", c);
+    } else {
+        printOne(c, m);
+    }
+}
+
+void exec(char start, struct Map *m) {
+    struct Wheel *w;
+    int i;
+
+    if (m == NULL) {
+        printf("Unable to proceed.");
+        return;
+    }
+
+    for (i = 0; i < 20; i++) {
+        printOne(start, m);
+    }
+    printf("\n");
+}
+
+void group1() {
+    struct Wheel *a = create("123");
+
+    struct Map *m = insert('A', a, NULL);
+
+    exec('A', m);
+}
+
+void group2() {
+    struct Wheel *a = create("1B2");
+    struct Wheel *b = create("34");
+
+    struct Map *m = insert('A', a, NULL);
+    m = insert('B', b, m);
+
+    exec('A', m);
+}
+
+void group3() {
+    struct Wheel *a = create("1DD");
+    struct Wheel *d = create("678");
+
+    struct Map *m = insert('A', a, NULL);
+    m = insert('D', d, m);
+
+    exec('A', m);
+}
+
+void group4() {
+    struct Wheel *a = create("1BC");
+    struct Wheel *b = create("34");
+    struct Wheel *c = create("5B");
+
+    struct Map *m = insert('A', a, NULL);
+    m = insert('B', b, m);
+    m = insert('C', c, m);
+
+    exec('A', m);
+}
+
+int main() {
+    group1();
+    group2();
+    group3();
+    group4();
+
+    return 0;
+}