Initial data commit

Task/Singly-linked-list-Element-insertion/PL-I/singly-linked-list-element-insertion.pli

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+/* Let H be a pointer to a node in a one-way-linked list. */
+/* Insert an element, whose value is given by variable V, following that node. */
+
+allocate node set (Q);
+node.p = H; /* The new node now points at the list where we want to insert it. */
+node.value = V;
+H->p = Q;   /* Break the list at H, and point it at the new node. */