There are solutions for the following codechef problems:

1. A1 - Paying Up (problem site)
2. A2 - Johnny and the Beanstalk (problem site)
3. ARRGRAPH - Graph on an Array (problem site)
4. B5 - Squash the Bugs (problem site
5. BBRICS - Beautiful Bricks (problem site
6. BIAS - (Challenge) Biased Committee (problem site
7. BINADD - Addition (problem site
8. BINXOR - Binary XOR (problem site
9. BROCLK - Broken Clock (problem site
10. BSHUFFLE - Bad Shuffle (problem site)
11. BTAR - Beautiful Array (problem site
12. CARDMGK - Chef and Card Trick (problem site)
13. CARPTUN - Car-pal Tunnel (problem site
14. CHFRAN - Chefina and Ranges (problem site
15. CIELAB - Ciel and A-B Problem (problem site
16. CLANDLBL - Chef And Land Labeling (problem site
17. CHANOQ - Chef and odd queries (subtask #1) (problem site
18. CHEFADV - Chef and Adventures (problem site)
19. CHEFCCYL - Chef and Cycled Cycles (problem site)
20. CHEFCHR - Chef And His Characters (problem site
21. CHEFCOUN - Counter Test For CHEFSUM (problem site)
22. CHEFGP - Chef and a great voluntary Program (problem site)
23. CHEFKNN - Chef and Interval Painting (subtask #1) (problem site)
24. CHEFPTNT - Chef And The Patents (problem site
25. CHEFSUM - Little Chef and Sums (problem site
26. CK87GSUB - Chef and Counting Test (problem site
27. CK87MEDI - Chef and Employment Test (problem site
28. CK87QUER - Chef and Weird Queries (problem site
29. DLDAG - (Challenge) Delete DAG (problem site)
30. DYNAMO - Chef and Dynamo (problem site)
31. EGGFREE - Egg-free DAG (problem site)
32. EQUILIBR - Reach Equilibrium (problem site)
33. FBMT - Football Match (problem site
34. GCDCNT - Chef and Gcd Queries (problem site)
35. GCDMOD - Modular GCD (problem site)
36. INMAT - Interactive Matrix (problem site)
37. JERRYTOM - Tom and Jerry (problem site)
38. JIIT - Queries on Matrix (problem site)
39. KCOMPRES - Coordinate Compression (problem site)
40. KCON - K-Concatenation (problem site)
41. LAZERTST - Lasers Everywhere Alternative (problem site)
42. LONGCOOK - Long Contest and Cook Off Overlaps (problem site)
43. LUCASTH - Lucas Theorem (subtask #1) (problem site
44. MAGICHF - Magician versus Chef (problem site)
45. MARM - Array Modification (problem site)
46. MAXSC - Maximum Score (problem site)
47. MEX - Max Mex (problem site)
48. MINDSUM - Minimize Digitsum (problem site)
49. MINVOTE - Minions and Voting (problem site)
50. MIXCOLOR - Mix the Colors (problem site)
51. MONSTER - Killing Monsters (subtask #1) (problem site)
52. MSV - Chef and Maximum Star Value (problem site)
53. NBOTS - (Challenge) Nanobots (problem site)
54. NMNMX - No Minimum No Maximum (problem site)
55. PERFCONT - A Balanced Contest (problem site)
56. PERMPAL - Permutation and Palindrome (problem site
57. PHOTOCOM - Sasha and Photos (prooblem site)
58. POINPOLY - Points Inside A Polygon (problem site
59. PRTITION - Partition the numbers (problem site)
60. PSHTRG - Pishty and Triangles (problem site)
61. QUALPREL - Qualifying to Pre-Elimination (problem site)
62. RAINBOWA - Chef and Rainbow Array (problem site
63. RECTANGL - Rectangle (problem site)
64. SEGPROD - Product on the segment by modulo (subtask #1) (problem site)
65. SONGIF - Sonya and Gifts (problem site)
66. STICNOT - Sticky Notes (problem site)
67. STRMRG - String Merging (subtask #1) (problem site)
68. TABGAME - Table Game (problem site)
69. TYPING - Chef and Typing (problem site)
70. XORIER - War of XORs (problem site)
71. XXOR - Chef and Easy Problem (problem site)