數據表記錄包含表索引和數值，請對表索引相同的記錄進行合並，即將相同索引的數值進行求和運算，輸出按照key值升序進行輸出。

輸入描述:

先輸入鍵值對的個數
然後輸入成對的index和value值，以空格隔開

輸出描述:

輸出合並後的鍵值對（多行）

#include <iostream>
#include <stdio.h>

using namespace std;

struct table{
    int id;
    int value;
    struct table *next;
};

typedef struct table *LinkList;

void
 
 AddNode(LinkList *HeadList,int id,int value,int i)
{
    LinkList p = *HeadList;
    for(int j = 0;j < i;j++)
        p = p->next;
    LinkList node = (LinkList)malloc(sizeof(struct table));
    p->next = node;
    node->id = id;
    node->value = value;
    node->next = NULL;

}
void
 
 swap(LinkList *Node1,LinkList *Node2)
{
    LinkList Node3 = (LinkList)malloc(sizeof(struct table));
    LinkList node1 = *Node1;
    LinkList node2 = *Node2;

    Node3->id = node1->id;
    Node3->value = node1->value;

    node1->id = node2->id;
    node1->value = node2->value;

    node2
 
->id = Node3->id;
    node2->value = Node3->value;    
}
void Rank(LinkList *HeadList)
{
    LinkList p = *HeadList;
    p = p->next;
    while(p != NULL){
        LinkList p_p = *HeadList;
        p_p = p_p->next;
        while(p_p != NULL){
            if(p->id < p_p->id)
                swap(&p,&p_p);
            p_p = p_p->next;
        }
        p = p->next;
    }
}
void ListPrint(LinkList *HeadList){
    LinkList p = *HeadList;
    p = p->next;
    while(p != NULL){
        while(p->id == p->next->id){
            if(p->next != NULL)
            {
                p->next->value += p->value;
                p = p->next;
            }
            else
                break;
        }
        printf("%d %d",p->id,p->value);
        printf("\n");
        p = p->next;
        
    }
}
int main()
{
    int id,value;
    LinkList list = (LinkList)malloc(sizeof(struct table));
    int n;
    list->id = 0;
    list->value = 0;
    while(scanf("%d",&n) != EOF){
        for(int i = 0;i < n;i++){
            scanf("%d %d",&id,&value);
            AddNode(&list,id,value,i);
        }
        Rank(&list);
        ListPrint(&list);
    }
    free(list);
    return 0;
}

ACM-單向鏈表的操作