Problemset - Codeforces

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Codeforces Round 945 (Div. 2)
3 days
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number theory

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Problems

#	Name
1968C	Assembly via Remainders constructive algorithms, number theory	1000	x18466
1968A	Maximize? brute force, math, number theory	800	x25984
1967B2	Reverse Card (Hard Version) brute force, math, number theory	2200	x2920
1967B1	Reverse Card (Easy Version) brute force, math, number theory	1400	x9424
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x4893
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x990
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x3449
1954E	Chain Reaction binary search, data structures, dsu, greedy, implementation, math, number theory	2200	x1788
1954C	Long Multiplication greedy, math, number theory	1200	x15703
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x12002
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x20369
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2097
1945H	GCD is Greater brute force, data structures, math, number theory	2600	x491
1945B	Fireworks math, number theory	900	x19712
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	x17821
1933C	Turtle Fingers: Count the Values of k brute force, implementation, math, number theory	1100	x20514
1933B	Turtle Math: Fast Three Task implementation, math, number theory	800	x29966
1932G	Moving Platforms graphs, math, number theory, shortest paths	2300	x881
1932E	Final Countdown implementation, math, number theory	1600	x6813
1932B	Chaya Calendar number theory	1100	x18415
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2450
1931D	Divisible Pairs combinatorics, math, number theory	1300	x15870
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1550
1928C	Physical Education Lesson brute force, math, number theory	1600	x7486
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x10067
1925B	A Balanced Problemset? brute force, greedy, math, number theory	1200	x18244
1920C	Partitioning the Array brute force, math, number theory	1600	x11839
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1658
1916G	Optimizations From Chelsu divide and conquer, dp, number theory, trees	3500	x132
1916B	Two Divisors constructive algorithms, math, number theory	1000	x23663
1916A	2023 constructive algorithms, implementation, math, number theory	800	x24564
1909E	Multiple Lamps bitmasks, brute force, constructive algorithms, math, number theory	2400	x1248
1909D	Split Plus K greedy, math, number theory	1900	x3984
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x13920
1907E	Good Triples brute force, combinatorics, number theory	1600	x8823
1906G	Grid Game 2 games, number theory	2900	x145
1902C	Insert and Equalize brute force, constructive algorithms, greedy, math, number theory	1300	x12264
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3716
1899D	Yarik and Musical Notes hashing, math, number theory	1300	x12229
1899B	250 Thousand Tons of TNT brute force, implementation, number theory	1100	x18129
1899A	Game with Integers games, math, number theory	800	x38067
1896H2	Cyclic Hamming (Hard Version) brute force, dp, fft, math, number theory	3500	x87
1896H1	Cyclic Hamming (Easy Version) brute force, divide and conquer, dp, fft, math, number theory	3400	x78
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	x14480
1879F	Last Man Standing brute force, data structures, number theory	2800	x471
1878F	Vasilije Loves Number Theory brute force, math, number theory	1900	x3715
1877C	Joyboard math, number theory	1200	x10077
1876B	Effects of Anti Pimples combinatorics, number theory, sortings	1500	x7533
1875C	Jellyfish and Green Apple bitmasks, greedy, math, number theory	1400	x10790
1872C	Non-coprime Split math, number theory	1100	x22015
1866B	Battling with Numbers combinatorics, math, number theory	1400	x7213
1864C	Divisor Chain bitmasks, constructive algorithms, math, number theory	1300	x12607
1859A	United We Stand constructive algorithms, math, number theory	800	x29413
1858C	Yet Another Permutation Problem constructive algorithms, greedy, math, number theory	1000	x21967
1858B	The Walkway brute force, dp, greedy, math, number theory	1500	x10651
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x23835
1852A	Ntarsis' Set binary search, math, number theory	1800	x7575
1850F	We Were Both Children brute force, implementation, math, number theory	1300	x17241
1848E	Vika and Stone Skipping brute force, implementation, math, number theory	2600	x744
1848C	Vika and Price Tags math, number theory	1800	x5963
1845F	Swimmers in the Pool dp, fft, math, number theory	2800	x354
1845A	Forbidden Integer constructive algorithms, implementation, math, number theory	800	x24637
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	x11634
1838C	No Prime Differences constructive algorithms, math, number theory	1400	x13454
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	x2066
1830C	Hyperregular Bracket Strings combinatorics, greedy, hashing, math, number theory, sortings	2400	x1529
1828B	Permutation Swap math, number theory	900	x20690
1826C	Dreaming of Freedom greedy, math, number theory	1300	x12804
1826B	Lunatic Never Content math, number theory	1100	x15776
1823C	Strongly Composite greedy, math, number theory	1300	x11678
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	x6503
1816A	Ian Visits Mary constructive algorithms, geometry, number theory	800	x16939
1815E	Bosco and Particle dp, math, number theory, strings	3100	x326
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	x11577
1810B	Candies constructive algorithms, math, number theory	800	x17145
1806F1	GCD Master (easy version) greedy, math, number theory, sortings	2900	x329
1804C	Pull Your Luck brute force, greedy, math, number theory	1500	x11542
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	x7792
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	x3349
1792E	Divisors and Table brute force, dfs and similar, dp, number theory	2400	x1307
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	x17063
1787B	Number Factorization greedy, math, number theory	1100	x12706
1783E	Game of the Year brute force, data structures, math, number theory	2300	x2033
1781D	Many Perfect Squares brute force, math, number theory	1800	x5252
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	x1305

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