OJ Board

Can anyone tell me what's wrong with this (I got Runtime Error SIGSEGV) [cpp] // ACM #10100: Longest Match #include <ctype.h> #include <stdio.h> #include <string.h> #define MAXLLEN 1000 #define MAXWLEN 20 #define MAXNW 55 #define MAX(A,B) ((A)>(B)?(A):(B)) char line[MAXLLEN+1],w1[MAXNW+1][MAXWLEN+1]...

Hi, I am at USACO section 1.2.5 and am stuck at the problem Stringsobits. I tried generating all possible strings and of course got TLE when my program had to generate 2^31 strings. Here's the problem. I would appreciate any help given. Thank you very much. Consider an ordered set S of strings of N ...

Couldn't find any mistakes in this code. Tested with many test cases and all ran perfectly, but I still get a WA from the judge. Please help. [cpp]#include <stdio.h> #include <stdlib.h> #include <string.h> const int NOSCORE=16843009; struct { char name[11]; int sc[3][30]; // score for each try } guy...

Is there any particular problems of number theorey?
please any1 write the name and no of problems related to number theorey.

Well, there are many problems that require a good foundation in Mathematics to solve. After all, algorithmics and programming have a base in Mathematics and logic.

Please don't distribute your solutions against requests via emails. May be one person is trying to gather codes in different identities. Also, certain people may be solving ACM problems as part of their homework, so sending them the solutions via email is equivalent to doing their homework for them...

Hi, I got a WA for the following code. I have a strong feeling that the error is due to inaccuracy in using floating point real numbers. However, the possibility of a flawed algorithm must not be ruled out. I would appreciate any help provided, as well as sample test cases. Thank you in advance. [cp...

The problem statement states that, for each number, there exists a sought base and it is less than 100 Therefore, I do not think that you have to consider base 100. This is so far the only difference I can see between your code and my code, which was Accepted. You may want to try this. Good luck.

Using standard backtracking is enough to solve this problem. I am actually quite surprised that greedy algorithm works for this problem. My greedy algorithm works like this. 1. For each position p on the board, find the number of positions that a rook placed at p can attack. Let a[ p ] be the numbe...

It is actually possible to solve the problem without using floating point real numbers. That way, you will not face problems such as inaccuracy. Try to use integers as far as possible.

Am I right to say the OJ accepted the wrong answer?

You may want to post your source code here.

well problemsetter bhai, thanks for your great teaching. it's very important use. will it work on cygwin? will there be any problem to judge if i use clock_t will it return compile error? I think the functions in time.h are available for any compiler. However, I don't see any point in sending a pro...

Just use Submit-o-matic and all such problems will be solved.

If n is the number of people, then
(n^n-n+1) is the number of coconuts. Am I right? And if I am, then why do I get WA?

The formula n^n-n+1 does not work.

Compare function. [cpp]int cmp(const void *va, const void *vb) { tdata *a = (tdata*)va; tdata *b = (tdata*)vb; return a->key - b->key; }[/cpp] Calling the quicksort function. [cpp]qsort(data, 1000, sizeof(data), cmp);[/cpp] Quite easy. The skill of using the function comes with experience. Good luck.

However, do take note that since int and double are not 1 byte, you cannot do things like memset(a, 1, sizeof(a)) and expect a[0..99] to be 1.

You can use memset to set an array all to 0 or -1. I do not know of any other values that will work, unless you memset a char array of course.