[Bug 572607] [NEW] Incorrect answer in the 'cube' task
Public bug reported: Binary package hint: gbrainy The 'correct' answer in the 'Cube' problem is indeed wrong. The task reads: "How many cubes do you count in the figure below? (not counting the figure)", and the picture of a big cube subdivided into n^3 small cubes follows (see attachment). The number n is either 4, 5, or 6. GBrainy says that for each n the correct answer is n^3 (i. e. 64 for n = 4, 125 for n = 5 and 216 for n = 6), but obviously that's wrong. There are also sub-cubes of sizes 2x2x2, 3x3x3 and so on. For example, in the case of n = 4, one can find 99 cubes: 8 = 2^3 cubes of size 3x3x3, 27 = 3^3 cubes of size 2x2x2 and 64 = 4^3 cubes of size 1x1x1. So, for an arbitrary n the correct answer is 1^3 + 2^3 + ... + n^3. In particular, the answer for n = 5 is 224, the answer for n = 6 is 440, and, as already mentioned, the answer for n =4 is 99. ** Affects: gbrainy (Ubuntu) Importance: Undecided Status: New -- Incorrect answer in the 'cube' task https://bugs.launchpad.net/bugs/572607 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 572607] Re: Incorrect answer in the 'cube' task
** Attachment added: "brainy.png" http://launchpadlibrarian.net/46709648/brainy.png -- Incorrect answer in the 'cube' task https://bugs.launchpad.net/bugs/572607 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 572607] Re: Incorrect answer in the 'cube' task
@Kamus, what? If rows = columns = deepth = 4, then ans becomes 4*4*4 = 64. But that's not the correct answer, neither is 96. The correct answer is 99. 'Deepth'" (should be 'depth' of course) is not the number of faces. It's the number of cubes in the third dimension. The correct code should be n = random.Next(max_random) ans = 0 for i in xrange(2, n + 1): ans += i**3 Alternatively, one can use the closed-form formula to compute the sum: n = random.Next(max_random) ans = (n*(n + 1) / 2)**2 - 1 It should be noted that in the case of unequal dimensions (i. e. rows, cols and depth differ from each other) the task gets a bit harder. -- Incorrect answer in the 'cube' task https://bugs.launchpad.net/bugs/572607 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 572607] Re: Incorrect answer in the 'cube' task
@Jordi Mas, yes, that will be OK but not too interesting to solve. I think almost everyone can easily guess, that he should just raise the number to the power 3. The game you noted is better, because it features boxes and not only cubes, thus taking some time to perceive an image. -- Incorrect answer in the 'cube' task https://bugs.launchpad.net/bugs/572607 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 572607] Re: Incorrect answer in the 'cube' task
Yes, I think that wording change from comment #5 will do. But is it an easy fix? Don't forget about i18n. If we consider a short-term maintenance series, maybe it's easier to fix the answer as suggested by me in the comment #4. Some thoughts about 1.5x version: 1) Easy level: "How many single small cubes do you count in the figure below? Answer using a number" The figure is always a cube. 2) Medium level: Same question, but the figure is any box. 3) Hard level: "How many cubes do you count in the figure below? (not counting the figure)" The figure is a cube. -- Incorrect answer in the 'cube' task https://bugs.launchpad.net/bugs/572607 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 580683] [NEW] Load_Cycle_Count increases rapidly on Asus UL30Vt
Public bug reported: Binary package hint: acpi-support While running on battery, hard drive clicks approximately two times per minute. Load_Cycle_Count increases by one with each click. When plugged in, there is no such problem. I am using 64-bit Lucid on Asus UL30Vt laptop with "ATA WDC WD3200BEVT- 22ZCT0" hard drive. The "hdparm -B 254 /dev/sda" workaround seems to fix the problem, but I have to run that each time when I unplug the power cord. Not sure about the package. ** Affects: acpi-support (Ubuntu) Importance: Undecided Status: New -- Load_Cycle_Count increases rapidly on Asus UL30Vt https://bugs.launchpad.net/bugs/580683 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 82083] Re: evolution hangs on big multipart attachments
I can reproduce this as well. Today I received a mail with 20mb attachment and evolution hanged for ever while showing "Formatting message". This is quite annoying. -- evolution hangs on big multipart attachments https://bugs.launchpad.net/bugs/82083 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 41301] Re: Mouse clicks stop working sporadically
My friend has this weird problem too. Mouse clicks stop working randomly without any apparent reason, while he can still move the pointer. Keyboard works, but Alt-Tab stops working too, so that it becomes impossible to switch between windows. Looks like a problem with window manager, but this happens both with metacity and compiz. If I connect to his desktop via VNC, I cannot click anything either, Alt-Tab doesn't work for me too. Xev doesn't show any mouse events, event mouse movement over the window. If the mouse is re-plugged, everything starts working again. Using 64-bit Ubuntu 10.04 and latest (260.19.21) NVIDIA driver installed by hand (just becuase GeForce GTX 460 isn't supported by any driver available in Ubuntu repos). Otherwise the system is untouched. -- Mouse clicks stop working sporadically https://bugs.launchpad.net/bugs/41301 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
