11-散列3 QQ帐户的申请与登陆 (25分)
实现QQ新帐户申请和老帐户登陆的简化版功能。最大挑战是:据说现在的QQ号码已经有10位数了。
输入格式:
输入首先给出一个正整数NN(≤10^5),随后给出NN行指令。每行指令的格式为:“命令符(空格)QQ号码(空格)密码”。其中命令符为“N”(代表New)时表示要新申请一个QQ号,后面是新帐户的号码和密码;命令符为“L”(代表Login)时表示是老帐户登陆,后面是登陆信息。QQ号码为一个不超过10位、但大于1000(据说QQ老总的号码是1001)的整数。密码为不小于6位、不超过16位、且不包含空格的字符串。
输出格式:
针对每条指令,给出相应的信息:
1)若新申请帐户成功,则输出“New: OK”;
2)若新申请的号码已经存在,则输出“ERROR: Exist”;
3)若老帐户登陆成功,则输出“Login: OK”;
4)若老帐户QQ号码不存在,则输出“ERROR: Not Exist”;
5)若老帐户密码错误,则输出“ERROR: Wrong PW”。
输入样例:
5
L 1234567890 myQQ@qq.com
N 1234567890 myQQ@qq.com
N 1234567890 myQQ@qq.com
L 1234567890 myQQ@qq
L 1234567890 myQQ@qq.com
输出样例:
ERROR: Not Exist
New: OK
ERROR: Exist
ERROR: Wrong PW
Login: OK
解法一:散列表存储qq账号和密码(与电话聊天狂人解法相近)
#include
#include
#include
#include
#define KEYLENGTH 10
#define MAXTABLESIZE 100000
typedef char ElementType[KEYLENGTH + 1];
typedef char PasswordType[17];
typedef int Index;typedef struct LNode *PtrToLNode;
struct LNode {ElementType Data;PtrToLNode Next;PasswordType Pw; //增加密码
};
typedef struct LNode *List;
typedef struct LNode *Position;typedef struct TblNode *HashTable;
struct TblNode {int TableSize;List Heads;
};int NextPrime ( int n ) {if ( n == 1 ) return 2;else {int i, p = n % 2 ? n + 2 : n + 1;while ( p <= MAXTABLESIZE ) {double q = p;for ( i = sqrt(q); i > 2; i-- )if ( p % i ) break;if ( i == 2 ) break;else p += 2;}return p;}
}HashTable CreateTable ( int TableSize ) {HashTable H;H = (HashTable)malloc(sizeof(struct TblNode));H->TableSize = NextPrime( TableSize );H->Heads = (List)malloc(H->TableSize * sizeof(struct LNode));for ( int i = 0; i < H->TableSize; i++ ) {H->Heads[i].Data[0] = '\0';H->Heads[i].Pw[0] = '\0'; //初始化H->Heads[i].Next = NULL;}return H;
}Index Hash ( const char *key, int TableSize ) {unsigned int h = 0;while ( *key != '\0' ) {h = ( h << 5 ) + *key++;}return h % TableSize;
}Position Find ( HashTable H, ElementType Key ) {Position P;Index pos;pos = Hash( Key + 3, H->TableSize );P = H->Heads[pos].Next;while ( P && strcmp( P->Data, Key ) ) P = P->Next;return P;
}bool Insert ( HashTable H, ElementType Key, PasswordType Pw) {Index pos;if ( Find( H, Key ) ) return false;else {Position NewCell = (Position)malloc(sizeof(struct LNode));strcpy( NewCell->Data, Key );strcpy( NewCell->Pw, Pw ); //记录密码pos = Hash( Key + 3, H->TableSize );NewCell->Next = H->Heads[pos].Next;H->Heads[pos].Next = NewCell;return true;}
}void DestroyTable ( HashTable H ) {int i;Position Tmp, P;for ( i = 0; i < H->TableSize; i++ ) {P = H->Heads[i].Next;while ( P != NULL ) {Tmp = P;P = P->Next;free(Tmp);}}free( H->Heads );free( H );
}//检查密码是否正确
bool CheckPassword ( Position P, char pw[] ) {if ( strcmp( pw, P->Pw ) )return false;elsereturn true;
}//检查账户是否存在
bool FindAccount ( HashTable H, char qq[] ) {Position P;Index pos;pos = Hash( qq + 3, H->TableSize );P = H->Heads[pos].Next;while ( P != NULL ) {if ( strcmp( P->Data, qq ) == 0 )return 1;P = P->Next;}return 0;
}int main () {int N;char c, qq[11], pw[17];HashTable H;scanf("%d", &N);getchar();H = CreateTable( 2 * N );while ( N-- ) {scanf("%c %s %s", &c, qq, pw);getchar();if ( c == 'L' ) {if ( FindAccount( H, qq ) ) {if ( CheckPassword( Find( H, qq ), pw ) )printf("Login: OK\n");else printf("ERROR: Wrong PW\n");}else printf("ERROR: Not Exist\n");}else {if ( FindAccount( H, qq) ) printf("ERROR: Exist\n");else {printf("New: OK\n");Insert( H, qq, pw );}}}DestroyTable( H );system("pause");return 0;
}
解法二:排序,利用map容器
#include
#include
#include
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