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list of challenge problems

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ID NAME CODE USERS ACC %
6295    Area Difference SQDIFF 392 44.62
6646    Fully Parenthesized Expression BRACKETS 26 43.75
7063    Cycles, More Cycles CYCLE 21 82.50
7105    Reverse the Input REVINPUT 548 34.58
7480    Nth Prime NPRIME 620 45.61
7958    Prisoner of Benda (Challenge) BENDA 18 44.57
8102    Christmas Tree XMAS 830 66.28
8315    Number to Word NUMWORD 230 42.52
8638    Sum of Fibonacci numbers FIBSUM 136 72.76
8672    Distributing the balls BALLS 28 32.63
8675    Equation Check EQCHECK 266 57.37
8676    Digits of Phi (Golden Ratio) PHIVAL 294 53.58
8733    Summing up Last digits PLDGTS 31 61.86
8950    Grid points GRIDPNT 46 58.06
9380    Connecting three towns THREETWN 125 81.06
10295    HQNP Incomputable Hard HQNP2 61 76.53
11397    Find all independent nodes INDISET 26 89.36
11410    Find New SPOJ Problems FINDPROB 8 42.07
11445    EASY MATH (Challenge) EASYMATC 173 45.73
11689    Real Roots REALROOT 44 92.48
11719    The dojo s corridor M5TILE 74 64.29
11746    Sum the Series SUMUP 1941 58.80
11790    Size Contest!!!Reloaded!! JH1 350 38.74
11975    PIEK PIEK2 183 92.17
12393    Enigma Machine ENIGMAS 23 56.92
12655    Strongly Connected Chemicals SCCHEM 12 95.35
12845    Minimum knight moves Challenge NAKANJC 346 72.09
12874    Pell Fourth PELLFOUR 13 58.02
12919    Man of Steel MOS 25 67.46
12996    Wow Square WOW_SQR 127 54.69
13366    TWO KINGS CONQUER 19 58.15
13418    Fibonacci factorization BMS1988 10 29.70
13423    64bit-Fibonacci FIB64 152 43.83
13872    The SPP constant challenge SPPC 19 58.93
13929    Matrix Exponentiation MATEX 84 49.63
15036    Automatic Brainf##k Code Generator (Shortening AI) BFK_AUTO 94 51.85
15619    Optimal Swap Sort SWAPSORT 11 39.25
15673    Alice and Bob plays again CDGOLF1 16 66.78
16509    Divisors TJUC1 55 61.42
17257    Guess The Number With Lies v1 GUESSN1 33 47.13
17308    Guess The Number With Lies v2 GUESSN2 70 54.29
17598    Guess The Number With Lies v4 GUESSN4 15 63.79
17820    Guess The Number With Lies v5 GUESSN5 74 72.71
17867    Tone Transposition TONES 6 66.96
18837    Boring Factorials (Ultimate) BORING3 25 49.60
18901    The Secret Recipe CEBITO 45 77.51
18931    Sum of primes SUMPRIM1 58 25.23
19205    Modular Bernoulli MODBERN 7 50.00
19206    Power Sum PWSUMC 39 52.22
19397    Fibonacci Power Sum PWSUMF 17 51.88
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