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Difficulty Hard to Easy
LightOJ ID Ascending
LightOJ ID Descending
Basic Math
Big Integer Arithmetic
Chinese Remainder Theorem
Combinatorics
Extended Euclid
Generating Functions
Group Theory/Burnside's lemma
Inclusion/Exclusion
Modular Arithmetic
Number Theory
Pigeonhole Principle
Probability/Expected Value
Show unsolved only
Rooks
LOJ-1005
Easy
Solved by: 3247
Success rate: 44.63%
Solve
Mathematically Hard
LOJ-1007
Easy
Solved by: 2749
Success rate: 26.55%
Solve
Fibsieve's Fantabulous Birthday
LOJ-1008
Easy
Solved by: 5789
Success rate: 43.49%
Solve
Knights on a Chessboard
LOJ-1010
Easy
Solved by: 4824
Success rate: 29.17%
Solve
Iftar Party
LOJ-1014
Medium
Solved by: 2649
Success rate: 31.10%
Solve
A Childhood Game
LOJ-1020
Medium
Solved by: 2245
Success rate: 49.96%
Solve
Eid
LOJ-1024
Medium
Solved by: 1224
Success rate: 42.09%
Solve
A Dangerous Maze
LOJ-1027
Medium
Solved by: 1701
Success rate: 70.49%
Solve
Trailing Zeroes (I)
LOJ-1028
Easy
Solved by: 2144
Success rate: 23.16%
Solve
Discovering Gold
LOJ-1030
Medium
Solved by: 1445
Success rate: 56.11%
Solve
Intelligent Factorial Factorization
LOJ-1035
Easy
Solved by: 2565
Success rate: 61.70%
Solve
Race to 1 Again
LOJ-1038
Medium
Solved by: 1243
Success rate: 67.59%
Solve
Digits of Factorial
LOJ-1045
Easy
Solved by: 4208
Success rate: 54.89%
Solve
Efficient Pseudo Code
LOJ-1054
Medium
Solved by: 1414
Success rate: 29.79%
Solve
Parallelogram Counting
LOJ-1058
Medium
Solved by: 766
Success rate: 36.43%
Solve
Combinations
LOJ-1067
Medium
Solved by: 2246
Success rate: 39.49%
Solve
How Many Points?
LOJ-1077
Medium
Solved by: 1359
Success rate: 46.35%
Solve
Integer Divisibility
LOJ-1078
Medium
Solved by: 1953
Success rate: 52.75%
Solve
Just another Robbery
LOJ-1079
Medium
Solved by: 785
Success rate: 44.13%
Solve
Trailing Zeroes (II)
LOJ-1090
Medium
Solved by: 1495
Success rate: 56.71%
Solve
Arrange the Numbers
LOJ-1095
Medium
Solved by: 794
Success rate: 50.81%
Solve
A New Function
LOJ-1098
Medium
Solved by: 1039
Success rate: 60.91%
Solve
Again Array Queries
LOJ-1100
Medium Hard
Solved by: 399
Success rate: 41.13%
Solve
Problem Makes Problem
LOJ-1102
Medium
Solved by: 1078
Success rate: 49.76%
Solve
Birthday Paradox
LOJ-1104
Medium
Solved by: 815
Success rate: 50.12%
Solve
False Ordering
LOJ-1109
Easy
Solved by: 3945
Success rate: 77.53%
Solve
Ekka Dokka
LOJ-1116
Easy
Solved by: 4913
Success rate: 38.60%
Solve
Helping Cicada
LOJ-1117
Medium
Solved by: 838
Success rate: 53.22%
Solve
Cricket Ranking
LOJ-1124
Hard
Solved by: 194
Success rate: 42.81%
Solve
Trailing Zeroes (III)
LOJ-1138
Easy
Solved by: 2643
Success rate: 53.77%
Solve
How Many Zeroes?
LOJ-1140
Medium
Solved by: 1094
Success rate: 71.54%
Solve
Ray Gun
LOJ-1144
Medium Hard
Solved by: 288
Success rate: 36.20%
Solve
Mad Counting
LOJ-1148
Medium
Solved by: 1236
Success rate: 52.58%
Solve
Snakes and Ladders
LOJ-1151
Medium Hard
Solved by: 265
Success rate: 61.46%
Solve
Extreme GCD
LOJ-1161
Medium Hard
Solved by: 469
Success rate: 49.58%
Solve
Bank Robbery
LOJ-1163
Medium
Solved by: 809
Success rate: 52.65%
Solve
Counting Perfect BST
LOJ-1170
Medium Hard
Solved by: 704
Success rate: 36.68%
Solve
The Vindictive Coach
LOJ-1173
Medium Hard
Solved by: 301
Success rate: 52.50%
Solve
Josephus Problem
LOJ-1179
Medium
Solved by: 955
Success rate: 72.77%
Solve
Help Hanzo
LOJ-1197
Medium
Solved by: 1108
Success rate: 31.92%
Solve
Fantasy of a Summation
LOJ-1213
Medium
Solved by: 823
Success rate: 64.04%
Solve
Large Division
LOJ-1214
Easy
Solved by: 4144
Success rate: 51.48%
Solve
Finding LCM
LOJ-1215
Medium
Solved by: 1386
Success rate: 38.62%
Solve
Mysterious Bacteria
LOJ-1220
Medium
Solved by: 950
Success rate: 28.13%
Solve
One Unit Machine
LOJ-1226
Medium Hard
Solved by: 420
Success rate: 69.96%
Solve
Harmonic Number
LOJ-1234
Medium
Solved by: 1107
Success rate: 45.80%
Solve
Pairs Forming LCM
LOJ-1236
Medium
Solved by: 748
Success rate: 41.38%
Solve
Harmonic Number (II)
LOJ-1245
Medium
Solved by: 836
Success rate: 73.17%
Solve
Colorful Board
LOJ-1246
Hard
Solved by: 196
Success rate: 39.46%
Solve
Dice (III)
LOJ-1248
Medium
Solved by: 648
Success rate: 78.53%
Solve
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