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  • Fastest way to check if two square 2D arrays are rotationally and reflectively distinct

    - by kustrle
    The best idea I have so far is to rotate first array by {0, 90, 180, 270} degrees and reflect it horizontally or/and vertically. We basically get 16 variations [1] of first array and compare them with second array. if none of them matches the two arrays are rotationally and reflectively distinct. I am wondering if there is more optimal solution than this brute-force approach? [1] 0deg, no reflection 0deg, reflect over x 0deg, reflect over y 0deg, reflect over x and y 90deg, no reflection ...

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  • Problem installing Ubuntu 13.10 alongside Windows 8

    - by kustrle
    What I have: Sony Vaio laptop (SVE1512E6EW) with preinstalled Windows 8. I disabled Secure Boot some time ago in BIOS. I already had Ubuntu (previous version) installed on it, but removed it some time ago. After that, the default Windows boot menu is showing up everytime I boot up computer, and the only entry is Windows 8. What I did: Burned Ubuntu 13.10 DVD Restarted computer and booted from it Chosen Install Ubuntu (not Try Ubuntu) Created new ext4 partition from free space Installed Ubuntu on it What happened: After the installation I restarted computer. Windows default boot menu showed up (just as before) and the only entry was still Windows 8. If you have any additional questions I will try to answer them as fast as possible.

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