Submit | All submissions | Best solutions | Back to list |
FCTRL - Factorial |
The most important part of a GSM network is so called Base Transceiver Station (BTS). These transceivers form the areas called cells (this term gave the name to the cellular phone) and every phone connects to the BTS with the strongest signal (in a little simplified view). Of course, BTSes need some attention and technicians need to check their function periodically.
ACM technicians faced a very interesting problem recently. Given a set of BTSes to visit, they needed to find the shortest path to visit all of the given points and return back to the central company building. Programmers have spent several months studying this problem but with no results. They were unable to find the solution fast enough. After a long time, one of the programmers found this problem in a conference article. Unfortunately, he found that the problem is so called "Travelling Salesman Problem" and it is very hard to solve. If we have N BTSes to be visited, we can visit them in any order, giving us N! possibilities to examine. The function expressing that number is called factorial and can be computed as a product 1.2.3.4....N. The number is very high even for a relatively small N.
The programmers understood they had no chance to solve the problem. But because they have already received the research grant from the government, they needed to continue with their studies and produce at least some results. So they started to study behaviour of the factorial function.
For example, they defined the function Z. For any positive integer N, Z(N) is the number of zeros at the end of the decimal form of number N!. They noticed that this function never decreases. If we have two numbers N1<N2, then Z(N1) <= Z(N2). It is because we can never "lose" any trailing zero by multiplying by any positive number. We can only get new and new zeros. The function Z is very interesting, so we need a computer program that can determine its value efficiently.
Input
There is a single positive integer T on the first line of input (equal to about 100000). It stands for the number of numbers to follow. Then there are T lines, each containing exactly one positive integer number N, 1 <= N <= 1000000000.
Output
For every number N, output a single line containing the single non-negative integer Z(N).
Example
Sample Input:
6 3 60 100 1024 23456 8735373
Sample Output:
0 14 24 253 5861 2183837
Added by: | adrian |
Date: | 2004-05-09 |
Time limit: | 6s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: NODEJS PERL6 VB.NET |
Resource: | ACM Central European Programming Contest, Prague 2000 |
hide comments
|
||||||||||||||
2014-12-16 11:13:11 jenkhai
beware of floating point precision errors... |
||||||||||||||
2014-12-06 12:39:01 puts #{Jagpreet Singh Sasan}
i am getting wrong answer when i made it in c can u tell me the special case for which my program should give the right answer because the above mentioned test cases are working fine and even i have taken into consideration the long long int for the numbers. |
||||||||||||||
2014-12-02 14:04:54 Rohit Walavalkar
I am getting segmentation fault. I am running my code on my pc without any arguments . How shall I run it so that it is doesn't hive seg fault. This is my first program here. so bear with me |
||||||||||||||
2014-12-02 11:55:42 Swapnil Borse
@Manvender Singh Rathore Avoid what you are doing. Simply google the trick to find the number of trailing zeros for a given factorial and implement it in your favorite programming language. And there you go!! :) @Saurabh If you try an approach where you reserve huge memory or your pointers go beyond valid access you generally get those segmentation faults. Hope it was helpful. Last edit: 2014-12-02 11:57:32 |
||||||||||||||
2014-11-29 19:30:18 Jovan Babic
i keep getting the wrong answer, but on my IDE it works perfectly. I need help... |
||||||||||||||
2014-11-26 00:59:41 Saurabh
runtime error SIGXFSZ How to rectify this error? |
||||||||||||||
2014-11-25 08:52:51 Saurabh
how to rectify the time limit error? --ans(Francky)--> With a better algorithm. Last edit: 2014-11-25 09:29:00 |
||||||||||||||
2014-09-22 18:56:14 Parikshith Rai
Can anyone please explain me the question... it is askes to print the no of zeros at the end of factorial of a number.. but fact of 60 will have many zeros but in the output it is given that it has only 14 zeros.. thanks in advance :) |
||||||||||||||
2014-09-22 14:27:23 abhishek
is there any special cases in this program??,.. its working for those numbers in the o/p section ..still gives a wrong ans.. |
||||||||||||||
2014-09-08 13:46:53 Anvesh Kumar Arrabochu
TLE in python, 2.50 secs in C++ fml. |