Python实现Pat 1078. Hashing (25)

男娘i 2022-06-05 06:56 175阅读 0赞

# Pat 1078. Hashing (25) #

The task of this problem is simple: insert a sequence of distinct positive integers into a hash table, and output the positions of the input numbers. The hash function is defined to be “H(key) = key % TSize” where TSize is the maximum size of the hash table. Quadratic probing (with positive increments only) is used to solve the collisions.

Note that the table size is better to be prime. If the maximum size given by the user is not prime, you must re-define the table size to be the smallest prime number which is larger than the size given by the user.

### Input Specification: ###

Each input file contains one test case. For each case, the first line contains two positive numbers: MSize (<=104) and N (<=MSize) which are the user-defined table size and the number of input numbers, respectively. Then N distinct positive integers are given in the next line. All the numbers in a line are separated by a space.

### Output Specification: ###

For each test case, print the corresponding positions (index starts from 0) of the input numbers in one line. All the numbers in a line are separated by a space, and there must be no extra space at the end of the line. In case it is impossible to insert the number, print “-” instead.

Sample Input:  
4 4  
10 6 4 15  
Sample Output:  
0 1 4 -

--------------------

## 提交的代码 ##

def IsPrime(num):
        if num==1:
            return False
        elif num==2:
            return True
        elif(num%2==0):
            return False
        temp = num**0.5
        for i in range(3,int(temp+1),2):
            if num%i==0:
                return False
        return True
    line0= [int(x) for x in raw_input().split(' ')]
    line1= [int(x) for x in raw_input().split(' ')]
    MSize,N=line0[0],line0[1]
    while not IsPrime(MSize):
        MSize+=1
    bList=[False]*(MSize)
    for i in range(N):
        temp=line1[i]
        for j in range(MSize):
            index=(temp+j*j)% MSize
            if bList[index]==False:
                print index,
                bList[index]=True
                break
        else:
            print '-',

## 评测结果 ##

在PAT上提交后发现有一项运行超时了，但在牛客网是都可以通过的。

#### PAT ####

![评测结果PAT][PAT]

#### 牛客网 ####

![评测结果-牛客网][-]

[PAT]: /images/20220605/5f99305caf5841b6848bdaa6b0d216d7.png
[-]: /images/20220605/ef3b09d4da8d4480a24541e146e266c3.png