Problemset - Codeforces

→ Pay attention

Before contest
CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
34:12:42
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

number theory

Add tag

Problems

#	Name
2038K	Grid Walk brute force, dp, greedy, math, number theory	2100	x753
2037G	Natlan Exploring bitmasks, combinatorics, data structures, dp, math, number theory	2000	x1756
2037C	Superultra's Favorite Permutation constructive algorithms, greedy, math, number theory	1000	x14238
2036G	Library of Magic binary search, constructive algorithms, divide and conquer, interactive, math, number theory	2200	x1047
2036F	XORificator 3000 bitmasks, dp, number theory, two pointers	1900	x3248
2035B	Everyone Loves Tres constructive algorithms, greedy, math, number theory	900	x14464
2033F	Kosuke's Sloth brute force, math, number theory	1800	x5177
2032A	Circuit greedy, implementation, math, number theory	800	x20044
2031C	Penchick and BBQ Buns constructive algorithms, math, number theory	1300	x8830
2029E	Common Generator brute force, constructive algorithms, math, number theory	2100	x2342
2021B	Maximize Mex brute force, greedy, math, number theory	1200	x14246
2020F	Count Leaves dp, math, number theory	2900	x194
2020A	Find Minimum Operations bitmasks, brute force, greedy, math, number theory	800	x21808
2013E	Prefix GCD brute force, dp, greedy, math, number theory	2200	x3184
2008H	Sakurako's Test binary search, brute force, greedy, math, number theory	2100	x2905
2008G	Sakurako's Task binary search, greedy, math, number theory	1800	x5147
2008F	Sakurako's Box combinatorics, math, number theory	1400	x12486
2007C	Dora and C++ math, number theory	1500	x12209
2007A	Dora's Set greedy, math, number theory	800	x22612
2006C	Eri and Expanded Sets data structures, divide and conquer, math, number theory, two pointers	2300	x1637
2005D	Alter the GCD binary search, brute force, data structures, divide and conquer, implementation, number theory	2400	x873
2004E	Not a Nim Problem brute force, games, math, number theory	2100	x4053
2002F2	Court Blue (Hard Version) brute force, dp, math, number theory	2800	x433
2002F1	Court Blue (Easy Version) brute force, dfs and similar, dp, math, number theory	2600	x818
1998B	Minimize Equal Sum Subarrays constructive algorithms, math, number theory	1000	x23789
1996D	Fun binary search, brute force, combinatorics, math, number theory	1500	x15987
1995C	Squaring brute force, constructive algorithms, greedy, implementation, math, number theory	1800	x8586
1994H	Fortnite combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings	3500	x706
1994D	Funny Game constructive algorithms, dsu, graphs, greedy, math, number theory, trees	1900	x5771
1993F2	Dyn-scripted Robot (Hard Version) chinese remainder theorem, math, number theory	2800	x418
1993F1	Dyn-scripted Robot (Easy Version) brute force, chinese remainder theorem, constructive algorithms, math, number theory	2400	x1001
1992F	Valuable Cards brute force, dp, greedy, number theory, two pointers	1900	x5766
1991H	Prime Split Game bitmasks, dp, fft, games, math, number theory	3300	x505
1991D	Prime XOR Coloring bitmasks, constructive algorithms, graphs, greedy, math, number theory	1900	x6673
1986G2	Permutation Problem (Hard Version) brute force, data structures, hashing, math, number theory	2500	x1091
1986G1	Permutation Problem (Simple Version) binary search, brute force, combinatorics, data structures, math, number theory	2200	x1499
1986E	Beautiful Array greedy, math, number theory, sortings	1700	x8862
1985G	D-Function combinatorics, math, number theory	1600	x9446
1985B	Maximum Multiple Sum brute force, math, number theory	800	x46480
1982D	Beauty of the mountains brute force, data structures, implementation, math, number theory	1700	x7182
1982B	Collatz Conjecture brute force, implementation, math, number theory	1200	x16991
1981D	Turtle and Multiplication constructive algorithms, dfs and similar, graphs, number theory	2400	x1680
1980D	GCD-sequence greedy, implementation, math, number theory	1400	x14348
1979C	Earning on Bets binary search, combinatorics, constructive algorithms, number theory	1200	x18829
1978F	Large Graph data structures, dfs and similar, dsu, graphs, number theory, two pointers	2400	x1348
1977C	Nikita and LCM brute force, data structures, dp, greedy, math, number theory, sortings	1900	x6785
1973F	Maximum GCD Sum Queries bitmasks, brute force, dp, implementation, number theory	3100	x232
1968C	Assembly via Remainders constructive algorithms, number theory	1000	x25148
1968A	Maximize? brute force, math, number theory	800	x34724
1967B2	Reverse Card (Hard Version) brute force, math, number theory	2200	x3953
1967B1	Reverse Card (Easy Version) brute force, math, number theory	1400	x13358
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x6770
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x1280
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x4580
1954E	Chain Reaction binary search, data structures, dsu, greedy, implementation, math, number theory	2200	x2323
1954C	Long Multiplication greedy, math, number theory	1200	x19536
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x14543
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x23326
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2580
1945H	GCD is Greater brute force, data structures, math, number theory	2600	x678
1945B	Fireworks math, number theory	900	x22836
1934E	Weird LCM Operations brute force, constructive algorithms, number theory	3000	x241
1933D	Turtle Tenacity: Continual Mods constructive algorithms, greedy, math, number theory, sortings	1200	x20458
1933C	Turtle Fingers: Count the Values of k brute force, implementation, math, number theory	1100	x22775
1933B	Turtle Math: Fast Three Task implementation, math, number theory	800	x33076
1932G	Moving Platforms graphs, math, number theory, shortest paths	2300	x1095
1932E	Final Countdown implementation, math, number theory	1600	x8321
1932B	Chaya Calendar number theory	1100	x20964
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2878
1931D	Divisible Pairs combinatorics, math, number theory	1300	x19283
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1742
1928C	Physical Education Lesson brute force, math, number theory	1600	x8681
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x12088
1925B	A Balanced Problemset? brute force, greedy, math, number theory	1200	x20279
1920C	Partitioning the Array brute force, math, number theory	1600	x13898
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1816
1916G	Optimizations From Chelsu divide and conquer, dp, number theory, trees	3500	x149
1916B	Two Divisors constructive algorithms, math, number theory	1000	x26193
1916A	2023 constructive algorithms, implementation, math, number theory	800	x26161
1909E	Multiple Lamps bitmasks, brute force, constructive algorithms, math, number theory	2400	x1414
1909D	Split Plus K greedy, math, number theory	1900	x4497
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x17460
1907E	Good Triples brute force, combinatorics, number theory	1600	x10493
1906G	Grid Game 2 games, number theory	2900	x211
1902C	Insert and Equalize brute force, constructive algorithms, greedy, math, number theory	1300	x13984
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x4322
1899D	Yarik and Musical Notes hashing, math, number theory	1300	x13685
1899B	250 Thousand Tons of TNT brute force, implementation, number theory	1100	x21125
1899A	Game with Integers games, math, number theory	800	x48071
1896H2	Cyclic Hamming (Hard Version) brute force, dp, fft, math, number theory	3500	x105
1896H1	Cyclic Hamming (Easy Version) brute force, divide and conquer, dp, fft, math, number theory	3400	x90
1884D	Counting Rhyme dp, math, number theory	2100	x3291
1882E1	Two Permutations (Easy Version) brute force, constructive algorithms, greedy, number theory	2400	x1037
1881D	Divide and Equalize math, number theory	1300	x17762
1879F	Last Man Standing brute force, data structures, number theory	2800	x516
1878F	Vasilije Loves Number Theory brute force, math, number theory	1900	x4169
1877C	Joyboard math, number theory	1200	x11162
1876B	Effects of Anti Pimples combinatorics, number theory, sortings	1500	x8444
1875C	Jellyfish and Green Apple bitmasks, greedy, math, number theory	1400	x11902
1872C	Non-coprime Split math, number theory	1100	x23661

←