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Problem list problems
Problem Name Online Judge Contest Difficulty Level
1 The 3n + 1 problem Categories UVA 1
2 500! Categories UVA 1
3 Light, more light Categories UVA 1
4 Secret Research Categories UVA 1
5 Worms Categories Codeforces Codeforces Round #271 (Div. 2) 1
6 Hardwood Species Categories UVA 1
7 Ant on a Chessboard Categories UVA 1
8 Guessing Game Categories UVA 1
9 How Many Fibs? Categories UVA 1
10 Two Buttons Categories Codeforces Codeforces Round #295 (Div. 2) 1
11 Bit++ Categories Codeforces Codeforces Round #173 (Div. 2) 1
12 Hajj-e-Akbar Categories UVA 1
13 Goldbach's Conjecture Categories UVA 1
14 Digit Counting Categories UVA 1
15 Divisors Categories UVA 1
16 Periodic Strings Categories UVA 1
17 A Special "Happy Birthday" Song!!! Categories UVA 1
18 Minesweeper Categories UVA 1
19 Back to Intermediate Math Categories UVA 1
20 Fake NP Categories Codeforces Codeforces Round #411 (Div. 2) 1
21 Factorial Frequencies Categories UVA 1
22 Triangle Counting Categories UVA 1
23 Combination Lock Categories UVA 1
24 Bender B. Rodríguez Problem Categories UVA 1
25 Throwing cards away II Categories UVA 1
26 Theatre Square Categories Codeforces Codeforces Beta Round #1 1
27 How Many Points of Intersection? Categories UVA 1
28 Puzzles Categories Codeforces Codeforces Round #196 (Div. 2) 1
29 Parenthesis Balance I Categories URI 1
30 Prime Frequency Categories UVA 1
31 Google is Feeling Lucky Categories UVA 1
32 Mother bear Categories UVA 1
33 Oil Deposits Categories UVA 1
34 Leap Year or Not Leap Year and ... Categories UVA 1
35 Helpful Maths Categories Codeforces Codeforces Round #197 (Div. 2) 1
36 The number of positions Categories Codeforces Codeforces Beta Round #92 (Div. 2 Only) 1
37 Maximum GCD Categories UVA 1
38 Combinations Categories UVA 1
39 To Carry or not to Carry Categories UVA 1
40 Big Mod Categories UVA 1
41 Division of Nlogonia Categories UVA 1
42 Fermat vs. Pythagoras Categories UVA 1
43 T-primes Categories Codeforces Codeforces Round #142 (Div. 2) 1
44 Zeros and Ones Categories UVA 1
45 WERTYU Categories UVA 1
46 Soldier and Badges Categories Codeforces Codeforces Round #304 (Div. 2) 1
47 Buy a Shovel Categories Codeforces Codeforces Round #377 (Div. 2) 1
48 CD Categories UVA 1
49 Big Number of Teams will Solve This Categories UVA 1
50 Horror Dash Categories UVA 1
51 Palindromes Categories UVA 1
52 I Can Guess the Data Structure! Categories UVA 1
53 Hardest Problem Ever (Easy) Categories UVA 1
54 Hello World! Categories UVA 1
55 A Node Too Far Categories UVA 1
56 Parentheses Balance Categories UVA 1
57 Back to High School Physics Categories UVA 1
58 Count the factors Categories UVA 1
59 Cost Cutting Categories UVA 1
60 Twin Primes Categories UVA 1
61 Steps Categories UVA 1
62 Common Permutation Categories UVA 1
63 The Snail Categories UVA 1
64 Watermelon Categories Codeforces Codeforces Beta Round #4 (Div. 2 Only) 1
65 Perfection Categories UVA 1
66 A and B and Team Training Categories Codeforces Codeforces Round #294 (Div. 2) 1
67 Pizza Cutting Categories UVA 1
68 Triangle Wave Categories UVA 1
69 Jumping Mario Categories UVA 1
70 ID Codes Categories UVA 1
71 Humble Numbers Categories UVA 1
72 Ray Through Glasses Categories UVA 1
73 Credit Check Categories UVA 1
74 Hamster flight Categories SPOJ 1
75 Save Setu Categories UVA 1
76 Prime Distance Categories UVA 1
77 Polygon Inside A Circle Categories UVA 1
78 Greedy Gift Givers Categories UVA 1
79 Cows and Cars Categories UVA 1
80 Spanning Subtree Categories UVA 2
81 Laser Sculpture Categories UVA 2
82 Magic square palindromes. Categories UVA 2
83 The Last Non-zero Digit. Categories UVA 2
84 Longest Word Categories UVA 2
85 18,000 Seconds Remaining Categories UVA 2
86 Bubble Sort Categories UVA 2
87 Bachelor Arithmetic Categories UVA 2
88 Factoring Large Numbers Categories UVA 2
89 Airplane Categories UVA 2
90 Vasya and Multisets Categories Codeforces Educational Codeforces Round 51 (Rated for Div. 2) 2
91 Rock, Scissors, Paper Categories UVA 2
92 Digits Categories UVA 2
93 Divide by three, multiply by two Categories Codeforces Codeforces Round #479 (Div. 3) 2
94 Coconuts, Revisited Categories UVA 2
95 Anagrams Categories UVA 2
96 Snakes and Ladders Categories UVA 2
97 Knights of a Polygonal Table Categories Codeforces Codeforces Round #488 by NEAR (Div. 2) 3
98 Chessboard Categories UVA 3
99 Scrolling Sign Categories UVA 3
100 Determine the Shape Categories UVA 3