pta——电话聊天狂人(c二叉树实现)

给定大量手机用户通话记录,找出其中通话次数最多的聊天狂人。
输入格式:

输入首先给出正整数N(≤10​5​​),为通话记录条数。随后N行,每行给出一条通话记录。简单起见,这里只列出拨出方和接收方的11位数字构成的手机号码,其中以空格分隔。
输出格式:

在一行中给出聊天狂人的手机号码及其通话次数,其间以空格分隔。如果这样的人不唯一,则输出狂人中最小的号码及其通话次数,并且附加给出并列狂人的人数。
输入样例:

4
13005711862 13588625832
13505711862 13088625832
13588625832 18087925832
15005713862 13588625832

输出样例:

13588625832 3

思路:二叉树实现足已,hash可能更快不过用的不熟这里没用。

代码:

#include <stdio.h>
#include <stdlib.h>

typedef long long ll;
typedef struct Node* node;

struct Node {
    ll pNumber;
    ll number;
    node Left;
    node Right;
};

node nodeCreate(ll phoneNumber){
    node p = (node)malloc(sizeof(struct Node));
    p->number = 1;
    p->pNumber = phoneNumber;
    p->Left = NULL;
    p->Right = NULL;
    return p;
}

node Search(node root,ll phoneNumber){
    if(root == NULL)return root;
    node r = root;
    while(root){
        if(root->pNumber > phoneNumber){
            r = root;
            root = root->Left;
        }
        else if(root->pNumber < phoneNumber){
            r = root;
            root = root->Right;
        }
        else if(root->pNumber == phoneNumber)return root;
    }
    return r;
}

node Make(node root,ll phoneNumber){
    if(root == NULL){
        root = nodeCreate(phoneNumber);
    }
    else{
        node p = Search(root,phoneNumber);
        if(p->pNumber == phoneNumber)p->number++;
        else {
            if(p->pNumber>phoneNumber)p->Left = nodeCreate(phoneNumber);
            else p->Right = nodeCreate(phoneNumber);
        }
    }
    return root;
}

ll maxx,sum,mNumber;

void findResult(node root){
    if(root == NULL)return ;

    if(root->number<maxx);
    else if(root->number == maxx){
        sum++;
        if(root->pNumber<mNumber)mNumber = root->pNumber;
    }
    else if(root->number>maxx){
        sum = 1;
        maxx = root->number;
        mNumber = root->pNumber;
    }

    findResult(root->Left);
    findResult(root->Right);
}

int main(){

    node root = NULL;
    int N;
    scanf("%d",&N);
    while(N--){
        ll a,b;
        scanf("%lld %lld",&a,&b);
        root = Make(root,a);
        root = Make(root,b);
    }

    findResult(root);
    printf("%lld %lld",mNumber,maxx);
    if(sum>1)printf(" %lld",sum);

    return 0;
}
posted @ 2017-11-27 19:55  Assassin_poi君  阅读(384)  评论(0编辑  收藏  举报