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DS/C/Lab/Shortcodes/dllconcs.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef struct node {
+    int d;
+    struct node *l, *r;
+} *N;
+
+void concat(N *X1, N *X2) {
+    if (*X1 == NULL) *X1 = *X2;
+    else if (*X2) {
+        N t = *X1;
+        while (t->r) t = t->r;
+        t->r = *X2;
+        (*X2)->l = t;
+    }
+}
+
+N new_node(int d) {
+    N n = (N)malloc(sizeof(struct node));
+    n->d = d;
+    n->l = n->r = NULL;
+    return n;
+}
+
+void insert(N *h, int d) {
+    N n = new_node(d);
+    if (!*h) *h = n;
+    else {
+        N t = *h;
+        while (t->r) t = t->r;
+        t->r = n;
+        n->l = t;
+    }
+}
+
+void print(N h) {
+    while (h) {
+        printf("%d ", h->d);
+        h = h->r;
+    }
+    printf("\n");
+}
+
+int main() {
+    N X1 = NULL, X2 = NULL;
+    insert(&X1, 1);
+    insert(&X1, 2);
+    insert(&X1, 3);
+    insert(&X2, 4);
+    insert(&X2, 5);
+    concat(&X1, &X2);
+    print(X1);
+    return 0;
+}