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| WA #2 | Felagund | 1948. The Robot on the Line | 31 Oct 2013 02:11 | 1 |
WA #2 Felagund 31 Oct 2013 02:11 Could you please give me some tests?
Edited by author 31.10.2013 02:11 |
| If you got WA @ 5 | 198808xc | 1948. The Robot on the Line | 10 May 2013 17:16 | 1 |
Try this testcase:
1000000000 1000000000 -1000000000
The answer is 5.
My program uses unsigned int64 in C++, and gets overflow on this case. |
| Test question | Серовиков Андрей | 1948. The Robot on the Line | 4 Apr 2013 14:58 | 5 |
What's the answer for this test?
3
1 1 1
25000000 10001 1
1 -90000 -999890001 I'm using BigInteger arithmethic and BinSearch, but still WA2...
1) D<0: answer 1
2) sum(0, k-1):f(x1+i) -> as result, we need to compare a^2*(2*k-1)^2 and 9*D
what's wrong?
Edited by author 03.04.2013 18:40 Output of my (AC) program:
1
2
190523
I used standard C++ double type to solve it - it seems there're no difficult tests that fail it (or such tests are just impossible) BTW, for the case (2) my solution considers two different cases I found bug in logic, but still...
1) D<0: 1
2) a) sum(0, k-1):f(x0+0.5+i) -> as result, we need to compare F(x0+0.5) and a*(k-1)/2.0 + a*(k-1)*(2*k-1)/6.0 -> then multiply by 2
b) sum(0, k-1):f(x0+i) -> as result, we need to compare F(x0)/2.0 and a*(k-1)*(2*k-1)/6.0 -> then multiply by 2 and substract 1
Some more tests:
7
1 1 0
1 6 -9
1 0 -1
1 1000000000 -1000000000
1000000000 -1000000000 -1000000000
1234 987654321 -987654321
100000000 987654321 -987654321 |
| How to use reals with range 10^18 in pascal? | Shohruh | 1948. The Robot on the Line | 7 Jan 2013 01:19 | 4 |
can anybody explain me how to use reals with big range like 10^18 or 10^19 more precisely in pascal? If you need real numbers with best affordable precision - use long double ("extended" in pascal).
Edited by author 06.01.2013 23:12 I knew the solution was k=1 or trunc((1+12*b*b/(a*a)-3*c/a)). but i could not take precision. If you need real numbers with best affordable precision - use long double ("extended" in pascal).
F**k, spoiler =(
Then you don't need real numbers here - long long (int64 in Pascal) is enough to solve it |
| why the answer to the first sample is 2 I THANK IT IT 1 | Boleyn Su | 1948. The Robot on the Line | 6 Jan 2013 14:21 | 2 |
why the answer to the first sample is 2 I THANK IT IT 1
because let x=1 then f(x)=0 so it only takes 1 sec I misunderstood the statement. |
| WA1 Is the first test from task? | Birne Ageev [USU] (Psych up club) | 1948. The Robot on the Line | 5 Jan 2013 16:03 | 4 |
Re: Yes. (-) Birne Ageev [USU] (Psych up club) 5 Jan 2013 16:01 Re: Yes. (-) Birne Ageev [USU] (Psych up club) 5 Jan 2013 16:03 f**king
#ifndef ONLINE_JUDGE
Sorry for stupid questions. |
| Problem about H | mbrc | 1948. The Robot on the Line | 5 Jan 2013 15:59 | 2 |
Will the total dist travelled after k seconds be
f(x)+f(x+1)+f(x+2)+...f(x+k-1)
or
it will be
f(x+k-1) just?
Thanks! f(x)+f(x+1)+f(x+2)+...f(x+k-1) |
