Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Difficulty: —

number theory

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Problems

#	Name
1986G2	Permutation Problem (Hard Version) brute force, data structures, hashing, math, number theory	2500	x600
1986G1	Permutation Problem (Simple Version) binary search, brute force, combinatorics, data structures, math, number theory	2200	x906
1986E	Beautiful Array greedy, math, number theory, sortings	1700	x6010
1985G	D-Function combinatorics, math, number theory	1600	x6912
1985B	Maximum Multiple Sum brute force, math, number theory	800	x37249
1982D	Beauty of the mountains brute force, data structures, implementation, math, number theory	1700	x5035
1982B	Collatz Conjecture brute force, implementation, math, number theory	1200	x12995
1981D	Turtle and Multiplication constructive algorithms, dfs and similar, graphs, number theory	2400	x1225
1980D	GCD-sequence greedy, implementation, math, number theory	1400	x11978
1979C	Earning on Bets binary search, combinatorics, constructive algorithms, number theory	1200	x16021
1978F	Large Graph data structures, dfs and similar, dsu, graphs, number theory, two pointers	2400	x917
1977C	Nikita and LCM brute force, data structures, dp, greedy, math, number theory, sortings	1900	x5679
1973F	Maximum GCD Sum Queries bitmasks, brute force, dp, implementation, number theory	3100	x175
1968C	Assembly via Remainders constructive algorithms, number theory	1000	x22308
1968A	Maximize? brute force, math, number theory	800	x30612
1967B2	Reverse Card (Hard Version) brute force, math, number theory	2200	x3482
1967B1	Reverse Card (Easy Version) brute force, math, number theory	1400	x11671
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x5817
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x1103
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x3911
1954E	Chain Reaction binary search, data structures, dsu, greedy, implementation, math, number theory	2200	x1974
1954C	Long Multiplication greedy, math, number theory	1200	x17532
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x13050
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x21547
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2227
1945H	GCD is Greater brute force, data structures, math, number theory	2600	x554
1945B	Fireworks math, number theory	900	x20980
1934E	Weird LCM Operations brute force, constructive algorithms, number theory	3000	x198
1933D	Turtle Tenacity: Continual Mods constructive algorithms, greedy, math, number theory, sortings	1200	x18715
1933C	Turtle Fingers: Count the Values of k brute force, implementation, math, number theory	1100	x21389
1933B	Turtle Math: Fast Three Task implementation, math, number theory	800	x30989
1932G	Moving Platforms graphs, math, number theory, shortest paths	2300	x929
1932E	Final Countdown implementation, math, number theory	1600	x7374
1932B	Chaya Calendar number theory	1100	x19373
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2555
1931D	Divisible Pairs combinatorics, math, number theory	1300	x16884
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1600
1928C	Physical Education Lesson brute force, math, number theory	1600	x7905
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x10824
1925B	A Balanced Problemset? brute force, greedy, math, number theory	1200	x18875
1920C	Partitioning the Array brute force, math, number theory	1600	x12369
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1695
1916G	Optimizations From Chelsu divide and conquer, dp, number theory, trees	3500	x140
1916B	Two Divisors constructive algorithms, math, number theory	1000	x24389
1916A	2023 constructive algorithms, implementation, math, number theory	800	x24981
1909E	Multiple Lamps bitmasks, brute force, constructive algorithms, math, number theory	2400	x1289
1909D	Split Plus K greedy, math, number theory	1900	x4119
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x15002
1907E	Good Triples brute force, combinatorics, number theory	1600	x9332
1906G	Grid Game 2 games, number theory	2900	x157
1902C	Insert and Equalize brute force, constructive algorithms, greedy, math, number theory	1300	x12799
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3866
1899D	Yarik and Musical Notes hashing, math, number theory	1300	x12701
1899B	250 Thousand Tons of TNT brute force, implementation, number theory	1100	x18977
1899A	Game with Integers games, math, number theory	800	x40409
1896H2	Cyclic Hamming (Hard Version) brute force, dp, fft, math, number theory	3500	x98
1896H1	Cyclic Hamming (Easy Version) brute force, divide and conquer, dp, fft, math, number theory	3400	x87
1884D	Counting Rhyme dp, math, number theory	2100	x2969
1882E1	Two Permutations (Easy Version) brute force, constructive algorithms, greedy, number theory	2400	x977
1881D	Divide and Equalize math, number theory	1300	x15492
1879F	Last Man Standing brute force, data structures, number theory	2800	x479
1878F	Vasilije Loves Number Theory brute force, math, number theory	1900	x3914
1877C	Joyboard math, number theory	1200	x10414
1876B	Effects of Anti Pimples combinatorics, number theory, sortings	1500	x7794
1875C	Jellyfish and Green Apple bitmasks, greedy, math, number theory	1400	x11161
1872C	Non-coprime Split math, number theory	1100	x22559
1866B	Battling with Numbers combinatorics, math, number theory	1400	x7399
1864C	Divisor Chain bitmasks, constructive algorithms, math, number theory	1300	x12955
1859A	United We Stand constructive algorithms, math, number theory	800	x30355
1858C	Yet Another Permutation Problem constructive algorithms, greedy, math, number theory	1000	x22377
1858B	The Walkway brute force, dp, greedy, math, number theory	1500	x10909
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x24801
1852A	Ntarsis' Set binary search, math, number theory	1800	x7751
1850F	We Were Both Children brute force, implementation, math, number theory	1300	x17886
1848E	Vika and Stone Skipping brute force, implementation, math, number theory	2600	x757
1848C	Vika and Price Tags math, number theory	1800	x6096
1845F	Swimmers in the Pool dp, fft, math, number theory	2800	x359
1845A	Forbidden Integer constructive algorithms, implementation, math, number theory	800	x25527
1844G	Tree Weights bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees	3000	x673
1844D	Row Major constructive algorithms, greedy, math, number theory, strings	1400	x11903
1838C	No Prime Differences constructive algorithms, math, number theory	1400	x13799
1835D	Doctor's Brown Hypothesis dfs and similar, graphs, math, number theory	2900	x458
1834E	MEX of LCM binary search, data structures, implementation, math, number theory	2300	x2111
1830C	Hyperregular Bracket Strings combinatorics, greedy, hashing, math, number theory, sortings	2400	x1568
1828B	Permutation Swap math, number theory	900	x21498
1826C	Dreaming of Freedom greedy, math, number theory	1300	x13053
1826B	Lunatic Never Content math, number theory	1100	x16413
1823C	Strongly Composite greedy, math, number theory	1300	x11880
1822G2	Magic Triples (Hard Version) brute force, data structures, math, number theory	2200	x2356
1822G1	Magic Triples (Easy Version) brute force, data structures, math, number theory	1700	x6696
1816A	Ian Visits Mary constructive algorithms, geometry, number theory	800	x17066
1815E	Bosco and Particle dp, math, number theory, strings	3100	x332
1812F	Factorization *special problem, number theory		x967
1812D	Trivial Conjecture *special problem, constructive algorithms, math, number theory		x4356
1811E	Living Sequence binary search, dp, math, number theory	1500	x11821
1810B	Candies constructive algorithms, math, number theory	800	x17276
1806F1	GCD Master (easy version) greedy, math, number theory, sortings	2900	x342
1804C	Pull Your Luck brute force, greedy, math, number theory	1500	x11738
1801F	Another n-dimensional chocolate bar dp, math, meet-in-the-middle, number theory	2700	x554
1798F	Gifts from Grandfather Ahmed dp, math, number theory	2500	x474

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