优化了命名

C11-数据结构/ds/line/list/linklist/simple/polynomial/poly.c

@@ -0,0 +1,114 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef struct node_st
+{
+    int             coef;
+    int             exp;
+    struct node_st *next;
+} list;
+
+list *poly_create(int a[][2], int n)
+{
+    list *me, *newnode, *cur;
+
+    me = malloc(sizeof(me));
+    if (NULL == me)
+        return NULL;
+    me->next = NULL;
+
+    cur = me;
+
+    for (int i = 0; i < n; i++)
+    {
+        newnode = malloc(sizeof(*newnode));
+        if (NULL == newnode)
+            return NULL;
+
+        newnode->coef = a[i][0];
+        newnode->exp  = a[i][1];
+        newnode->next = NULL;
+
+        cur->next = newnode;
+        cur       = newnode;
+    }
+
+    return me;
+}
+
+void poly_show(list *me)
+{
+    list *cur;
+
+    for (cur = me->next; NULL != cur; cur = cur->next)
+    {
+        printf("(%d %d) ", cur->coef, cur->exp);
+    }
+    printf("\n");
+}
+
+void poly_union(list *p1, list *p2)
+{
+    list *p, *q, *r;
+
+    p = p1->next;
+    q = p2->next;
+    r = p1;
+
+    while (p && q)
+    {
+        if (p->exp < q->exp)
+        {
+            r->next = p;
+            r       = p;
+            p       = p->next;
+        }
+        else if (p->exp > q->exp)
+        {
+            r->next = q;
+            r       = q;
+            q       = q->next;
+        }
+        else
+        {
+            p->coef += q->coef;
+            if (p->coef)
+            {
+                r->next = p;
+                r       = p;
+            }
+
+            p = p->next;
+            q = q->next;
+        }
+    }
+
+    if (NULL == p)
+        r->next = q;
+    else
+        r->next = p;
+}
+
+int main()
+{
+    int a[][2] = {{5, 0}, {2, 1}, {8, 8}, {3, 16}};
+    int b[][2] = {{6, 1}, {16, 6}, {-8, 8}};
+
+    list *p1, *p2;
+
+    p1 = poly_create(a, 4);
+    if (NULL == p1)
+        exit(1);
+
+    p2 = poly_create(b, 3);
+    if (NULL == p2)
+        exit(1);
+
+    poly_show(p1);
+    poly_show(p2);
+
+    poly_union(p1, p2);
+    poly_show(p1);
+
+    exit(0);
+}