Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round 950 (Div. 3)
27:40:53
Register now »

→ Filter Problems

Difficulty: —

number theory

Add tag

Problems

#	Name
1981D	Turtle and Multiplication constructive algorithms, dfs and similar, graphs, number theory		x636
1977C	Nikita and LCM brute force, data structures, dp, greedy, math, number theory, sortings	1900	x4654
1973F	Maximum GCD Sum Queries bitmasks, brute force, dp, implementation, number theory	3100	x138
1968C	Assembly via Remainders constructive algorithms, number theory	1000	x20964
1968A	Maximize? brute force, math, number theory	800	x28997
1967B2	Reverse Card (Hard Version) brute force, math, number theory	2200	x3300
1967B1	Reverse Card (Easy Version) brute force, math, number theory	1400	x10802
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x5471
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x1052
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x3708
1954E	Chain Reaction binary search, data structures, dsu, greedy, implementation, math, number theory	2200	x1882
1954C	Long Multiplication greedy, math, number theory	1200	x16662
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x12459
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x20892
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2164
1945H	GCD is Greater brute force, data structures, math, number theory	2600	x510
1945B	Fireworks math, number theory	900	x20257
1934E	Weird LCM Operations brute force, constructive algorithms, number theory	3000	x187
1933D	Turtle Tenacity: Continual Mods constructive algorithms, greedy, math, number theory, sortings	1200	x18195
1933C	Turtle Fingers: Count the Values of k brute force, implementation, math, number theory	1100	x20890
1933B	Turtle Math: Fast Three Task implementation, math, number theory	800	x30377
1932G	Moving Platforms graphs, math, number theory, shortest paths	2300	x903
1932E	Final Countdown implementation, math, number theory	1600	x7052
1932B	Chaya Calendar number theory	1100	x18807
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2492
1931D	Divisible Pairs combinatorics, math, number theory	1300	x16285
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1579
1928C	Physical Education Lesson brute force, math, number theory	1600	x7680
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x10384
1925B	A Balanced Problemset? brute force, greedy, math, number theory	1200	x18521
1920C	Partitioning the Array brute force, math, number theory	1600	x12045
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1679
1916G	Optimizations From Chelsu divide and conquer, dp, number theory, trees	3500	x134
1916B	Two Divisors constructive algorithms, math, number theory	1000	x23944
1916A	2023 constructive algorithms, implementation, math, number theory	800	x24719
1909E	Multiple Lamps bitmasks, brute force, constructive algorithms, math, number theory	2400	x1266
1909D	Split Plus K greedy, math, number theory	1900	x4051
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x14372
1907E	Good Triples brute force, combinatorics, number theory	1600	x9005
1906G	Grid Game 2 games, number theory	2900	x148
1902C	Insert and Equalize brute force, constructive algorithms, greedy, math, number theory	1300	x12499
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3773
1899D	Yarik and Musical Notes hashing, math, number theory	1300	x12436
1899B	250 Thousand Tons of TNT brute force, implementation, number theory	1100	x18469
1899A	Game with Integers games, math, number theory	800	x39022
1896H2	Cyclic Hamming (Hard Version) brute force, dp, fft, math, number theory	3500	x94
1896H1	Cyclic Hamming (Easy Version) brute force, divide and conquer, dp, fft, math, number theory	3400	x83
1884D	Counting Rhyme dp, math, number theory	2100	x2889
1882E1	Two Permutations (Easy Version) brute force, constructive algorithms, greedy, number theory	2400	x967
1881D	Divide and Equalize math, number theory	1300	x14917
1879F	Last Man Standing brute force, data structures, number theory	2800	x475
1878F	Vasilije Loves Number Theory brute force, math, number theory	1900	x3834
1877C	Joyboard math, number theory	1200	x10239
1876B	Effects of Anti Pimples combinatorics, number theory, sortings	1500	x7623
1875C	Jellyfish and Green Apple bitmasks, greedy, math, number theory	1400	x10930
1872C	Non-coprime Split math, number theory	1100	x22276
1866B	Battling with Numbers combinatorics, math, number theory	1400	x7285
1864C	Divisor Chain bitmasks, constructive algorithms, math, number theory	1300	x12755
1859A	United We Stand constructive algorithms, math, number theory	800	x29782
1858C	Yet Another Permutation Problem constructive algorithms, greedy, math, number theory	1000	x22111
1858B	The Walkway brute force, dp, greedy, math, number theory	1500	x10746
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x24251
1852A	Ntarsis' Set binary search, math, number theory	1800	x7637
1850F	We Were Both Children brute force, implementation, math, number theory	1300	x17512
1848E	Vika and Stone Skipping brute force, implementation, math, number theory	2600	x752
1848C	Vika and Price Tags math, number theory	1800	x6014
1845F	Swimmers in the Pool dp, fft, math, number theory	2800	x356
1845A	Forbidden Integer constructive algorithms, implementation, math, number theory	800	x24946
1844G	Tree Weights bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees	3000	x654
1844D	Row Major constructive algorithms, greedy, math, number theory, strings	1400	x11726
1838C	No Prime Differences constructive algorithms, math, number theory	1400	x13604
1835D	Doctor's Brown Hypothesis dfs and similar, graphs, math, number theory	2900	x454
1834E	MEX of LCM binary search, data structures, implementation, math, number theory	2300	x2087
1830C	Hyperregular Bracket Strings combinatorics, greedy, hashing, math, number theory, sortings	2400	x1543
1828B	Permutation Swap math, number theory	900	x21002
1826C	Dreaming of Freedom greedy, math, number theory	1300	x12909
1826B	Lunatic Never Content math, number theory	1100	x16040
1823C	Strongly Composite greedy, math, number theory	1300	x11763
1822G2	Magic Triples (Hard Version) brute force, data structures, math, number theory	2200	x2331
1822G1	Magic Triples (Easy Version) brute force, data structures, math, number theory	1700	x6581
1816A	Ian Visits Mary constructive algorithms, geometry, number theory	800	x16980
1815E	Bosco and Particle dp, math, number theory, strings	3100	x330
1812F	Factorization *special problem, number theory		x963
1812D	Trivial Conjecture *special problem, constructive algorithms, math, number theory		x4347
1811E	Living Sequence binary search, dp, math, number theory	1500	x11675
1810B	Candies constructive algorithms, math, number theory	800	x17205
1806F1	GCD Master (easy version) greedy, math, number theory, sortings	2900	x333
1804C	Pull Your Luck brute force, greedy, math, number theory	1500	x11605
1801F	Another n-dimensional chocolate bar dp, math, meet-in-the-middle, number theory	2700	x550
1798F	Gifts from Grandfather Ahmed dp, math, number theory	2500	x471
1798C	Candy Store greedy, math, number theory	1700	x7856
1797E	Li Hua and Array brute force, data structures, dsu, math, number theory, two pointers	2300	x1203
1796F	Strange Triples brute force, math, number theory	2900	x170
1794D	Counting Factorizations combinatorics, divide and conquer, dp, math, number theory	1900	x3386
1792E	Divisors and Table brute force, dfs and similar, dp, number theory	2400	x1316
1789E	Serval and Music Game brute force, dp, implementation, math, number theory	2500	x773
1789A	Serval and Mocha's Array brute force, math, number theory	800	x17295
1787B	Number Factorization greedy, math, number theory	1100	x12812
1783E	Game of the Year brute force, data structures, math, number theory	2300	x2040
1781D	Many Perfect Squares brute force, math, number theory	1800	x5301

←