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Problem-Setting

This repository contains a comprehensive collection of competitive programming and math problems I have authored across multiple platforms. Each problem includes detailed information about tags, difficulty, source contests, and creation dates.

Total Problems: 100+ (including private problems)

Platforms

Note: If clicking on the problem links doesn't work directly, please copy the URL and paste it into your browser's address bar manually. This is due to a known issue with Codeforces Gym redirections.

International Math Olympiad

Created the first shortlist problem from Bangladesh in IMO 2021.

All Problems

# Title Tags Source Platform Created on
83 Substring Symphony Suffix Array, Data Structures, Binary Search Uttara University Inter-University Programming Contest IUPC Jun/20/2025
82 Divisible Perfection Adhoc Uttara University Inter-University Programming Contest IUPC Jun/20/2025
81 The Perfect Spider Web Geometry, Ternary Search, Half Plane Intersection Uttara University Inter-University Programming Contest IUPC Jun/20/2025
80 Symmetric Swap Hashing, NTT Uttara University Inter-University Programming Contest IUPC Jun/20/2025
79 Binomial XOR Bits, Basic Combinatorics Uttara University Inter-University Programming Contest IUPC Jun/20/2025
78 Red Dead Redemption 2 Graphs, DFS, Number Theory Uttara University Inter-University Programming Contest IUPC Jun/20/2025
77 LCM Factorization Number Theory, Combinatorics Betopia Group Presents DUET Inter University Programming Contest IUPC May/9/2025
76 XOR This OR That Bits, Pigeonhole, Bitmasks Betopia Group Presents DUET Inter University Programming Contest IUPC May/9/2025
75 Distinct of Distincts Constructive Betopia Group Presents DUET Inter University Programming Contest IUPC May/9/2025
74 An Interesting Problem Strings, Adhoc Betopia Group Presents DUET Inter University Programming Contest IUPC May/9/2025
73 Triangle Trap Geometry, Convex Hull Betopia Group Presents DUET Inter University Programming Contest IUPC May/9/2025
72 The Last Bit of Us Trees, Greedy Betopia Group Presents DUET Inter University Programming Contest IUPC May/9/2025
71 The Art of Rearrangement Adhoc MTB Presents AUST Inter University Programming Contest IUPC Feb/21/2025
70 Aloy and the Forbidden Code Giveaway MTB Presents AUST Inter University Programming Contest IUPC Feb/21/2025
69 Flip to Zero DP, BFS, Data Structures MTB Presents AUST Inter University Programming Contest IUPC Feb/21/2025
68 GCD and LCM in Perfect Sync Number Theory, Inclusion Exclusion MTB Presents AUST Inter University Programming Contest IUPC Feb/21/2025
67 Palindromic Palindrome Partition DP, Strings MTB Presents AUST Inter University Programming Contest IUPC Feb/21/2025
66 The Absolute MEX Challenge Constructive MTB Presents AUST Inter University Programming Contest IUPC Feb/21/2025
65 MEX OR Mania bitmasks, brute force, data structures, dsu, implementation, 2700 Codeforces Round 994 (Div. 2) CodeForces Dec/20/2024
64 Yet Another Crossover Episode Bits, SOS, DP ICPC ASIA DHAKA REGIONAL CONTEST 2024 IUPC Dec/7/2024
63 Shohag Loves Pebae math, number theory, 3500 CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) CodeForces Nov/23/2024
62 Shohag Loves Counting (Hard Version) dp, number theory, 3200 CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) CodeForces Nov/23/2024
61 Shohag Loves Counting (Easy Version) combinatorics, dp, math, number theory, 2800 CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) CodeForces Nov/23/2024
60 Shohag Loves Inversions combinatorics, dp, implementation, math, 2200 CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) CodeForces Nov/23/2024
59 Shohag Loves GCD constructive algorithms, greedy, math, number theory, 1700 CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) CodeForces Nov/23/2024
58 Shohag Loves XOR (Hard Version) bitmasks, brute force, math, number theory, 1800 CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) CodeForces Nov/23/2024
57 Shohag Loves XOR (Easy Version) bitmasks, brute force, math, number theory, 1200 CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) CodeForces Nov/23/2024
56 Shohag Loves Strings constructive algorithms, greedy, implementation, strings, 1000 CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) CodeForces Nov/23/2024
55 Shohag Loves Mod constructive algorithms, number theory, 800 CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) CodeForces Nov/23/2024
54 Adhoc King Adhoc, Constructive ICPC PRELIMINARY DHAKA SITE 2024 IUPC Nov/9/2024
53 Non-decreasing Sequence dp BCS Round 1 (Div. 3) BCS Jul/23/2022
52 Equal Digits greedy BCS Round 1 (Div. 3) BCS Jul/23/2022
51 String Removal greedy BCS Round 1 (Div. 3) BCS Jul/23/2022
50 XOR-Gun Bits National Girls' Programming Contest 2021 Toph Nov/26/2021
49 And... Yet Another AND Problem Bits Ada Lovelace National Girls' Programming Contest 2021 - Preliminary Toph Nov/19/2021
48 October 18, 2017 combinatorics, dp, math, 2700 Codeforces Round #752 (Div. 1) CodeForces Oct/30/2021
47 A Perfect Problem combinatorics, dp, math, 3200 Codeforces Round #752 (Div. 1) CodeForces Oct/30/2021
46 Artistic Partition divide and conquer, dp, implementation, number theory, 3000 Codeforces Round #752 (Div. 1) CodeForces Oct/30/2021
45 Extreme Extension dp, greedy, math, 2300 Codeforces Round #752 (Div. 1) CodeForces Oct/30/2021
44 Moderate Modular Mode constructive algorithms, math, number theory 1600 Codeforces Round #752 (Div. 1) CodeForces Oct/30/2021
43 Di-visible Confusion constructive algorithms, math, number theory 1300 Codeforces Round #752 (Div. 1) CodeForces Oct/30/2021
42 XOR Specia-LIS-t constructive algorithms, 1100 Codeforces Round #752 (Div. 2) CodeForces Oct/30/2021
41 Era greedy, 800 Codeforces Round #752 (Div. 2) CodeForces Oct/30/2021
40 You dfs and similar, dp, math, number theory, 2600 Codeforces Round #735 (Div. 2) CodeForces Jul/29/2021
39 Diane constructive algorithms, greedy, strings, 1800 Codeforces Round #735 (Div. 2) CodeForces Jul/29/2021
38 Mikasa bitmasks, greedy, 1800 Codeforces Round #735 (Div. 2) CodeForces Jul/29/2021
37 Cobb brute-force, greey, math, 1700 Codeforces Round #735 (Div. 2) CodeForces Jul/29/2021
36 Cherry greey, 800 Codeforces Round #735 (Div. 2) CodeForces Jul/29/2021
35 F Data Structures National High School Programming Contest 2021 Toph Jun/11/2021
34 On the Sea Bitwise Virtual Techfest 2020 Regional Programming Contest Toph Dec/04/2020
33 Giveaway Strings Virtual Techfest 2020 Regional Programming Contest Toph Dec/04/2020
32 Isn't It Strange? Math Virtual Techfest 2020 Regional Programming Contest Toph Dec/04/2020
31 You Math Virtual Techfest 2020 Regional Programming Contest Toph Dec/04/2020
30 Where Do Lovers Go? Bitwise Virtual Techfest 2020 Regional Programming Contest Toph Dec/04/2020
29 Panic! at the Disco berlekamp-massey, cayley-hamilton, hard, math, matrix-exponentiation, nov20, number-theory, randomized, recurrence November Challenge 2020 CodeChef Nov/6/2020
28 I Hate Symbo-LIS-m cook120, dynamic-programming, longest-inc-subsequence, medium, rajarshi_basu, sjshohag July Cook-Off 2020 CodeChef Jul/19/2020
27 MEX-ception constructive, cook120, easy-medium, rajarshi_basu, sjshohag July Cook-Off 2020 CodeChef Jul/19/2020
26 The In-XOR-able Task bitwise-operation, cook120, easy-medium, rajarshi_basu, sjshohag July Cook-Off 2020 CodeChef Jul/19/2020
25 What Is This, a Crossover Episode constructive, cook120, easy-medium, rajarshi_basu, sjshohag July Cook-Off 2020 CodeChef Jul/19/2020
24 Path-etic Products bipartite, cook120, easy-medium, prime-factorization, trees, rajarshi_basu, sjshohag July Cook-Off 2020 CodeChef Jul/19/2020
23 OR-thodox Distinction bitwise-operation, cook120, easy, rajarshi_basu, sjshohag July Cook-Off 2020 CodeChef Jul/19/2020
22 Even-tual Reduction cakewalk, cook120, rajarshi_basu, sjshohag July Cook-Off 2020 CodeChef Jul/19/2020
21 Weird Product divide-and-conquer, july20, medium-hard, polynomial, sjshohag July Challenge 2020 CodeChef Jul/03/2020
20 GCD of the Submasks hard, lagrange-interpolation, ltime84, number-theory, sjshohag May Lunchtime 2020 CodeChef May/30/2020
19 Product of Minimums math Bending Spoons 2020 CodeChef Apr/6/2020
18 Inverse of a Function combinatorics, discrete-logarithm, march20, medium-hard, sjshohag March Challenge 2020 CodeChef Mar/06/2020
17 Ppeerrffeecctt Ssqquuaarreess cook123, medium-hard, mobius-function, number-theoretic-transfmtn, polynomial, psychik, sjshohag October Cook-Off 2020 CodeChef Oct/18/2020
16 Isomorphic Morphism ad-hoc, cook123, medium, psychik, sjshohag October Cook-Off 2020 CodeChef Oct/18/2020
15 The In-XOR-able Task cook123, dynamic-programming, medium, psychik, sjshohag October Cook-Off 2020 CodeChef Oct/18/2020
14 An Inveractive Problem binary-search, cook123, interactive, medium, psychik, sjshohag October Cook-Off 2020 CodeChef Oct/18/2020
13 Yet Another Crossover Episode ad-hoc, constructive, cook123, easy-medium, psychik, sjshohag October Cook-Off 2020 CodeChef Oct/18/2020
12 Path-etic Sums ad-hoc, cook123, depth-first-search, easy, psychik, sjshohag October Cook-Off 2020 CodeChef Oct/18/2020
11 Decreasing Srrnmieeda cook123, easy, pigeonhole, psychik, sjshohag October Cook-Off 2020 CodeChef Oct/18/2020
10 Split the Str Ing ad-hoc, cook123, greedy, psychik, simple, sjshohag October Cook-Off 2020 CodeChef Oct/18/2020
9 The Selection Graph Contest Based on SUST Intra University Programming Contest 2019 Toph Dec/20/2019
8 Subset AND Greedy Contest Based on SUST Intra University Programming Contest 2019 Toph Dec/20/2019
7 Enormous Product Math Contest Based on SUST Intra University Programming Contest 2019 Toph Dec/20/2019
6 Ant-Man And The Polygon Geometry Contest Based on SUST Intra University Programming Contest 2019 Toph Dec/20/2019
5 Playing On A Directed Graph Graph, ShortestPath Contest Based on SUST Intra University Programming Contest 2019 Toph Dec/20/2019
4 Permutations and Divisors Greedy, Math Contest Based on SUST Intra University Programming Contest 2019 Toph Dec/20/2019
3 XOR Partition BinarySearch Contest Based on SUST Intra University Programming Contest 2019 Toph Dec/20/2019
2 String Is Not That Easy Greedy Contest Based on SUST Intra University Programming Contest 2019 Toph Dec/20/2019
1 Perfect Points NumberTheory Contest Based on SUST Intra University Programming Contest 2019 Toph Dec/20/2019

Additional Problems

HackerRank

I have set 15-20 problems on HackerRank. Unfortunately they are private, so can't share the link here.

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