## Search found 83 matches

- Sat Oct 22, 2005 1:02 pm
- Forum: Volume 109 (10900-10999)
- Topic: 10947 - Bear with me, again..
- Replies:
**23** - Views:
**3183**

I think most problems from the last contest were badly specified (if not downright wrong, as was the case for problem A). Does anyone know how big can the coordinates be? Will a sum of squares overflow a long long? I have also tried using doubles, but nothing seems to work. My algorithm simply uses ...

- Sun Oct 09, 2005 6:17 pm
- Forum: Volume 109 (10900-10999)
- Topic: 10927 - Bright Lights
- Replies:
**26** - Views:
**14165**

Just sort the points according to their angle from the origin, and then a linear search suffices to find the visible points (after which you need to sort them again to meet the output specifications). In fact, for the first sorting the only thing needed is that points collinear with (0, 0) are next ...

- Tue Sep 27, 2005 8:43 pm
- Forum: Volume 107 (10700-10799)
- Topic: 10736 - Series of PI
- Replies:
**6** - Views:
**3124**

One more important thing - my ACC program outputs for N = 7 the answer 9 and not 10 as the ACC program from david ?! All other answers of my program are same as his answers ( I mean if we use the input from Observer ). The 10th term of the taylor expansion for arcsin(x) is 12155/1245184*x^19, and t...

- Tue Sep 27, 2005 8:07 pm
- Forum: Volume 107 (10700-10799)
- Topic: 10763 - Foreign Exchange
- Replies:
**45** - Views:
**18064**

I ask those of you who got AC with O(N). What was your method? If you mean O(N) expected time, then hashing is a correct solution. I don't know why some of you seem to imply that it is "logically incorrect". Just keep a hash table that can be indexed by an ordered pair of numbers and contains the n...

- Mon Sep 26, 2005 5:32 pm
- Forum: Volume 109 (10900-10999)
- Topic: 10905 - Children's Game
- Replies:
**66** - Views:
**26154**

The idea is actually very intuitive. In fact when I wrote my solution, I didn't think of any justification, but if you are interested there is one in the last paragraph. Let "++" stand for the operation of concatenation of strings. If you put string "a" after (but not neccesarily next to) string "b"...

- Fri Apr 15, 2005 3:39 pm
- Forum: Volume 108 (10800-10899)
- Topic: 10834 - The Story of Two Coins
- Replies:
**18** - Views:
**4430**

- Mon Apr 11, 2005 10:19 pm
- Forum: Volume 108 (10800-10899)
- Topic: 10834 - The Story of Two Coins
- Replies:
**18** - Views:
**4430**

Thanks for replying. The proper way to read and print long doubles is with %Lf, not with %llf. I haven't had any problems so far using %llf (just as %lli for long longs). In any case changing this leads to WA again. Make sure to print 0.000 instead of -0.000. But when should I do so? If a number is ...

- Thu Mar 24, 2005 4:19 pm
- Forum: Volume 108 (10800-10899)
- Topic: 10834 - The Story of Two Coins
- Replies:
**18** - Views:
**4430**

Can anyone tell me why this code returns WA? (The code is a bit ugly but very simple, just computes the angle 'a' the center of the coin has rotated, and then the position of T). I have used long doubles to account for precision errors. By the way, are there any test cases in which the coin has not ...

- Sat Nov 13, 2004 7:38 pm
- Forum: Volume 107 (10700-10799)
- Topic: 10760 - Translation or rotation
- Replies:
**13** - Views:
**4481**

- Mon Nov 01, 2004 5:08 pm
- Forum: Volume 3 (300-399)
- Topic: 315 - Network
- Replies:
**68** - Views:
**22229**

- Mon Nov 01, 2004 1:26 am
- Forum: Volume 3 (300-399)
- Topic: 315 - Network
- Replies:
**68** - Views:
**22229**

Can anyone tell me what's wrong with my program? It prints the correct answer for every input I have tried, but gives WA after 0.000 s, so I thought the problem might be input-related and added some extra checking (i.e, white spaces at the end of the line or cheking end of input file), but to no ava...

- Sun Oct 24, 2004 6:41 pm
- Forum: Volume 107 (10700-10799)
- Topic: 10740 - Not the Best
- Replies:
**23** - Views:
**13268**

- Fri Oct 22, 2004 6:11 pm
- Forum: Volume 107 (10700-10799)
- Topic: 10744 - The Optimal Super-Highway
- Replies:
**29** - Views:
**14946**

But I can't understand How I find medians in linear time ? I use partition method that use quick sort. But it's worst case complexity is O(nlogn) Please some one help me to get medians in linear time. Even when counting sort isn't possible, the median can be found in linear time. The idea is simila...

- Wed Oct 20, 2004 10:47 pm
- Forum: Volume 107 (10700-10799)
- Topic: 10744 - The Optimal Super-Highway
- Replies:
**29** - Views:
**14946**

We can ignore 99.045 (since it is constant for all points), but result (10203) is too big for counting sort. What is my mistake ? Why do you say 10203 is too big for counting sort??? The numbers ax + by will always be in the range -40000...40000, so you need an array of 80000 integers, which easily...

- Wed Oct 20, 2004 10:39 pm
- Forum: Volume 107 (10700-10799)
- Topic: 10736 - Series of PI
- Replies:
**6** - Views:
**3124**