a103:
Prime number
Content
Given a integer 'num' you need to check whether it is a prime number or not.
for each test case there's only one query, so you do not need to build a prime table to optimized your solution just solve it in plain way.
In math, prime numbers are whole numbers greater than 1, that have only two factors – 1 and the number itself.
Prime numbers are divisible only by the number 1 or itself.
Input
an Integer num
2<=num<=99999
Output
if num is prime number then print '%d is a prime number' %num
else print '%d is not a prime number' %num
Sample Input
#1
2
Sample Output
#1
2 is a prime number
Sample Input
#2
3
Sample Output
#2
3 is a prime number
Sample Input
#3
8
Sample Output
#3
8 is not a prime number
測資資訊：
記憶體限制：
64
MB
不公開 測資點#0 (33%): 1.0s , <1K
不公開 測資點#1 (33%): 1.0s , <1K
不公開 測資點#2 (34%): 1.0s , <1K
不公開 測資點#0 (33%): 1.0s , <1K
不公開 測資點#1 (33%): 1.0s , <1K
不公開 測資點#2 (34%): 1.0s , <1K
Hint ：
when there's exist a factor 'f' then num/'f' is also it's factor, so you only need to check the factors until int(sqrt(num))
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| ID | User | Problem | Subject | Hit | Post Date |
| 1952 | a103 | 11 | 2025-04-15 16:42 |