11-散列1 电话聊天狂人 (25 分)
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(≤105),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:
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| 4 13005711862 13588625832 13505711862 13088625832 13588625832 18087925832 15005713862 13588625832 //结尾无空行
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输出样例:
代码
本篇文章主要代码源自于陈越姥姥的课程里的小白专场
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#include<stdio.h> #include<stdlib.h> #include<string.h> #include<stdbool.h>
#include<math.h> #define KEYLENGTH 11 #define MAXTABLESIZE 100000 #define MAXD 5 typedef char ElementType[KEYLENGTH+1]; typedef int Index; typedef struct LNode *PtrToLNode; struct LNode { ElementType Data; PtrToLNode Next; int Count; }; typedef PtrToLNode Position; typedef PtrToLNode List; typedef struct TblNode *HashTable; struct TblNode { int TableSize; List Heads; };
int NextPrime(int N) { int i,p=(N%2)?N+2:N+1; while(p<=MAXTABLESIZE) { for(i=(int)sqrt(p);i>2;i--) if(!(p%i)) break; if(i==2) break; else p+=2; } return p; } int Hash(int Key,int TableSize) {
return Key%TableSize; } HashTable CreateTable(int TableSize) { HashTable H; int i; H = (HashTable)malloc(sizeof(struct TblNode)); H->TableSize = NextPrime(TableSize); H->Heads = (List)malloc(H->TableSize * sizeof(struct LNode)); for(i=0;i<H->TableSize;i++) { H->Heads[i].Data[0]='\0'; H->Heads[i].Next = NULL; H->Heads[i].Count = 0; } return H; }
Position Find(HashTable H,ElementType Key) { Position P; Index Pos; Pos = Hash(atoi(Key+KEYLENGTH-MAXD),H->TableSize); P = H->Heads[Pos].Next; while(P && strcmp(P->Data,Key)) P = P->Next; return P; } bool Insert(HashTable H,ElementType Key) { Position P,NewCell; Index Pos; P = Find(H,Key); if(! P) { NewCell = (Position)malloc(sizeof(struct LNode)); strcpy(NewCell->Data,Key); NewCell->Count = 1; Pos = Hash(atoi(Key+KEYLENGTH-MAXD),H->TableSize); NewCell->Next = H->Heads[Pos].Next; H->Heads[Pos].Next = NewCell; }else { P->Count ++; return false; } }
void DestroyTable(HashTable H) { int i; Position P,Tmp; for(i=0;i<H->TableSize;i++) { P = H->Heads[i].Next; while(P) { Tmp = P->Next; free(P); P = Tmp; } } free(H->Heads); free(H); }
void ScanAndOutput(HashTable H) { int i; int MaxCnt = 0; int PCnt = 0; ElementType MinPhone; List Ptr; MinPhone[0] = '\0'; for(i=0;i<H->TableSize;i++) { Ptr = H->Heads[i].Next; while(Ptr) { if(Ptr->Count > MaxCnt) { MaxCnt = Ptr->Count; strcpy(MinPhone,Ptr->Data); PCnt = 1; }else if (Ptr->Count == MaxCnt) { PCnt ++; if(strcmp(MinPhone,Ptr->Data)>0) strcpy(MinPhone,Ptr->Data); } Ptr = Ptr->Next; } } printf("%s %d",MinPhone,MaxCnt); if(PCnt > 1) printf(" %d",PCnt); printf("\n"); } int main() { int N,i; ElementType Key; HashTable H; scanf("%d",&N); H = CreateTable(N*2); for(i=0;i<N;i++) { scanf("%s",Key); Insert(H,Key); scanf("%s",Key);Insert(H,Key); } ScanAndOutput(H); DestroyTable(H); return 0; }
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