Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round 945 (Div. 2)
2 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

number theory

Add tag

Problems

#	Name
1968C	Assembly via Remainders constructive algorithms, number theory	1000	x18787
1968A	Maximize? brute force, math, number theory	800	x26351
1967B2	Reverse Card (Hard Version) brute force, math, number theory	2200	x2980
1967B1	Reverse Card (Easy Version) brute force, math, number theory	1400	x9610
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x4968
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x1001
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x3476
1954E	Chain Reaction binary search, data structures, dsu, greedy, implementation, math, number theory	2200	x1795
1954C	Long Multiplication greedy, math, number theory	1200	x15792
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x12048
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x20409
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2108
1945H	GCD is Greater brute force, data structures, math, number theory	2600	x495
1945B	Fireworks math, number theory	900	x19751
1934E	Weird LCM Operations brute force, constructive algorithms, number theory	3000	x183
1933D	Turtle Tenacity: Continual Mods constructive algorithms, greedy, math, number theory, sortings	1200	x17861
1933C	Turtle Fingers: Count the Values of k brute force, implementation, math, number theory	1100	x20561
1933B	Turtle Math: Fast Three Task implementation, math, number theory	800	x30003
1932G	Moving Platforms graphs, math, number theory, shortest paths	2300	x882
1932E	Final Countdown implementation, math, number theory	1600	x6827
1932B	Chaya Calendar number theory	1100	x18448
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2454
1931D	Divisible Pairs combinatorics, math, number theory	1300	x15895
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1552
1928C	Physical Education Lesson brute force, math, number theory	1600	x7501
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x10085
1925B	A Balanced Problemset? brute force, greedy, math, number theory	1200	x18260
1920C	Partitioning the Array brute force, math, number theory	1600	x11849
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1660
1916G	Optimizations From Chelsu divide and conquer, dp, number theory, trees	3500	x132
1916B	Two Divisors constructive algorithms, math, number theory	1000	x23684
1916A	2023 constructive algorithms, implementation, math, number theory	800	x24575
1909E	Multiple Lamps bitmasks, brute force, constructive algorithms, math, number theory	2400	x1251
1909D	Split Plus K greedy, math, number theory	1900	x3988
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x13952
1907E	Good Triples brute force, combinatorics, number theory	1600	x8834
1906G	Grid Game 2 games, number theory	2900	x145
1902C	Insert and Equalize brute force, constructive algorithms, greedy, math, number theory	1300	x12293
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3722
1899D	Yarik and Musical Notes hashing, math, number theory	1300	x12242
1899B	250 Thousand Tons of TNT brute force, implementation, number theory	1100	x18153
1899A	Game with Integers games, math, number theory	800	x38150
1896H2	Cyclic Hamming (Hard Version) brute force, dp, fft, math, number theory	3500	x88
1896H1	Cyclic Hamming (Easy Version) brute force, divide and conquer, dp, fft, math, number theory	3400	x79
1884D	Counting Rhyme dp, math, number theory	2100	x2809
1882E1	Two Permutations (Easy Version) brute force, constructive algorithms, greedy, number theory	2400	x961
1881D	Divide and Equalize math, number theory	1300	x14522
1879F	Last Man Standing brute force, data structures, number theory	2800	x471
1878F	Vasilije Loves Number Theory brute force, math, number theory	1900	x3719
1877C	Joyboard math, number theory	1200	x10085
1876B	Effects of Anti Pimples combinatorics, number theory, sortings	1500	x7539
1875C	Jellyfish and Green Apple bitmasks, greedy, math, number theory	1400	x10801
1872C	Non-coprime Split math, number theory	1100	x22034
1866B	Battling with Numbers combinatorics, math, number theory	1400	x7220
1864C	Divisor Chain bitmasks, constructive algorithms, math, number theory	1300	x12614
1859A	United We Stand constructive algorithms, math, number theory	800	x29438
1858C	Yet Another Permutation Problem constructive algorithms, greedy, math, number theory	1000	x21981
1858B	The Walkway brute force, dp, greedy, math, number theory	1500	x10657
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x23863
1852A	Ntarsis' Set binary search, math, number theory	1800	x7578
1850F	We Were Both Children brute force, implementation, math, number theory	1300	x17263
1848E	Vika and Stone Skipping brute force, implementation, math, number theory	2600	x745
1848C	Vika and Price Tags math, number theory	1800	x5967
1845F	Swimmers in the Pool dp, fft, math, number theory	2800	x354
1845A	Forbidden Integer constructive algorithms, implementation, math, number theory	800	x24655
1844G	Tree Weights bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees	3000	x644
1844D	Row Major constructive algorithms, greedy, math, number theory, strings	1400	x11639
1838C	No Prime Differences constructive algorithms, math, number theory	1400	x13468
1835D	Doctor's Brown Hypothesis dfs and similar, graphs, math, number theory	2900	x449
1834E	MEX of LCM binary search, data structures, implementation, math, number theory	2300	x2068
1830C	Hyperregular Bracket Strings combinatorics, greedy, hashing, math, number theory, sortings	2400	x1531
1828B	Permutation Swap math, number theory	900	x20717
1826C	Dreaming of Freedom greedy, math, number theory	1300	x12812
1826B	Lunatic Never Content math, number theory	1100	x15809
1823C	Strongly Composite greedy, math, number theory	1300	x11686
1822G2	Magic Triples (Hard Version) brute force, data structures, math, number theory	2200	x2312
1822G1	Magic Triples (Easy Version) brute force, data structures, math, number theory	1700	x6507
1816A	Ian Visits Mary constructive algorithms, geometry, number theory	800	x16940
1815E	Bosco and Particle dp, math, number theory, strings	3100	x328
1812F	Factorization *special problem, number theory		x956
1812D	Trivial Conjecture *special problem, constructive algorithms, math, number theory		x4339
1811E	Living Sequence binary search, dp, math, number theory	1500	x11587
1810B	Candies constructive algorithms, math, number theory	800	x17150
1806F1	GCD Master (easy version) greedy, math, number theory, sortings	2900	x329
1804C	Pull Your Luck brute force, greedy, math, number theory	1500	x11547
1801F	Another n-dimensional chocolate bar dp, math, meet-in-the-middle, number theory	2700	x546
1798F	Gifts from Grandfather Ahmed dp, math, number theory	2500	x467
1798C	Candy Store greedy, math, number theory	1700	x7798
1797E	Li Hua and Array brute force, data structures, dsu, math, number theory, two pointers	2300	x1196
1796F	Strange Triples brute force, math, number theory	2900	x169
1794D	Counting Factorizations combinatorics, divide and conquer, dp, math, number theory	1900	x3350
1792E	Divisors and Table brute force, dfs and similar, dp, number theory	2400	x1308
1789E	Serval and Music Game brute force, dp, implementation, math, number theory	2500	x763
1789A	Serval and Mocha's Array brute force, math, number theory	800	x17079
1787B	Number Factorization greedy, math, number theory	1100	x12713
1783E	Game of the Year brute force, data structures, math, number theory	2300	x2033
1781D	Many Perfect Squares brute force, math, number theory	1800	x5260
1780G	Delicious Dessert binary search, dsu, hashing, math, number theory, string suffix structures	2400	x671
1780F	Three Chairs bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings	2300	x1375
1780E	Josuke and Complete Graph binary search, brute force, data structures, math, number theory	2400	x1307

←