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list of challenge problems

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ID NAME CODE USERS ACC %
3880    Nop NOP 607 49.87
4163    Relative Board RELBOARD 6 38.10
4246    Place the Numbers II PLCNUM2 542 66.35
5842    Polybius square POLYBIUS 1029 59.24
6125    Dos Date DDATE 791 55.83
6173    Burned Pancakes Tower DBP 23 64.61
6295    Area Difference SQDIFF 388 44.61
6646    Fully Parenthesized Expression BRACKETS 26 43.75
7063    Cycles, More Cycles CYCLE 16 83.43
7105    Reverse the Input REVINPUT 546 34.56
7225    Word To Number WORDNUM 156 61.22
7480    Nth Prime NPRIME 618 45.60
7958    Prisoner of Benda (Challenge) BENDA 17 45.49
8102    Christmas Tree XMAS 828 66.22
8638    Sum of Fibonacci numbers FIBSUM 135 72.81
8672    Distributing the balls BALLS 26 32.73
8675    Equation Check EQCHECK 264 57.38
8676    Digits of Phi (Golden Ratio) PHIVAL 294 53.60
8733    Summing up Last digits PLDGTS 31 72.01
8950    Grid points GRIDPNT 44 57.73
9380    Connecting three towns THREETWN 122 81.08
10295    HQNP Incomputable Hard HQNP2 61 76.53
11397    Find all independent nodes INDISET 24 89.30
11410    Find New SPOJ Problems FINDPROB 8 42.66
11445    EASY MATH (Challenge) EASYMATC 159 45.68
11451    Aritho-geometric Series (AGS) (Challenge) AGSCHALL 55 47.17
11462    Fun with Fibonacci Series (Challenge) FIBFUNCH 289 34.35
11689    Real Roots REALROOT 36 93.08
11719    The dojo s corridor M5TILE 71 64.41
11746    Sum the Series SUMUP 1931 58.76
11790    Size Contest!!!Reloaded!! JH1 347 38.70
11793    Cartesian Shortest Path CSPATH 54 43.98
11815    Tiling a WxH Grid With Dominoes MNTILE 41 54.16
11849    A Very Easy Problem! (Challenge Mode) EPROBLEM 81 50.95
11975    PIEK PIEK2 181 92.21
12393    Enigma Machine ENIGMAS 21 56.96
12655    Strongly Connected Chemicals SCCHEM 7 94.59
12845    Minimum knight moves Challenge NAKANJC 345 72.11
12874    Pell Fourth PELLFOUR 13 64.17
12919    Man of Steel MOS 25 67.46
12996    Wow Square WOW_SQR 126 55.39
13366    TWO KINGS CONQUER 17 62.42
13418    Fibonacci factorization BMS1988 10 30.60
13423    64bit-Fibonacci FIB64 151 43.89
13872    The SPP constant challenge SPPC 19 61.46
13929    Matrix Exponentiation MATEX 84 50.33
14530    Quadratic primes GOV04 10 63.31
14808    Discrete Math Problem (shorten) GCD4 24 58.99
15036    Automatic Brainf##k Code Generator (Shortening AI) BFK_AUTO 92 51.86
15619    Optimal Swap Sort SWAPSORT 9 43.29
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