Problemset - Codeforces

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Spectral::Cup 2026 Round 1 (Codeforces Round 1094, Div. 1 + Div. 2)
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Problems

#	Name
1923C	Find B constructive algorithms, greedy	1400	x18427
1922E	Increasing Subsequences bitmasks, constructive algorithms, divide and conquer, greedy, math	1800	x9079
1922D	Berserk Monsters brute force, data structures, dsu, implementation, math	1900	x6767
1922C	Closest Cities greedy, implementation, math	1300	x21979
1921F	Sum of Progression brute force, data structures, dp, implementation, math	1900	x4989
1921E	Eat the Chip brute force, games, greedy, math	1600	x11388
1920D	Array Repetition binary search, brute force, dsu, implementation, math	1900	x6484
1920C	Partitioning the Array brute force, math, number theory	1600	x19861
1919C	Grouping Increases data structures, dp, greedy	1400	x28487
1918D	Blocking Elements binary search, data structures, dp, implementation, two pointers	1900	x6165
1918C	XOR-distance bitmasks, greedy, implementation, math	1400	x16622
1917C	Watering an Array brute force, greedy, implementation, math	1600	x12365
1916D	Mathematical Problem brute force, constructive algorithms, geometry, math	1700	x9753
1915G	Bicycles graphs, greedy, implementation, shortest paths, sortings	1800	x9654
1915F	Greetings data structures, divide and conquer, sortings	1500	x22090
1915E	Romantic Glasses data structures, greedy, math	1300	x34409
1914F	Programming Competition dfs and similar, dp, graph matchings, greedy, trees	1900	x4989
1914E2	Game with Marbles (Hard Version) games, greedy, sortings	1400	x14727
1914E1	Game with Marbles (Easy Version) brute force, games, greedy, sortings	1400	x14220
1913C	Game with Multiset binary search, bitmasks, brute force, greedy	1300	x17477
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x4188
1912D	Divisibility Test math	1900	x1977
1912A	Accumulator Apex data structures, implementation, sortings	1900	x2980
1910D	Remove and Add *special problem, greedy	1800	x407
1910C	Poisonous Swamp special problem, special problem, implementation, implementation	1600	x734
1910B	Security Guard *special problem, greedy	1600	x802
1909I	Short Permutation Problem combinatorics, dp, fft, math	1900	x174
1909D	Split Plus K greedy, math, number theory	1900	x5117
1909C	Heavy Intervals constructive algorithms, data structures, dsu, greedy, math, sortings	1400	x13149
1907F	Shift and Reverse greedy, sortings	1800	x5991
1907E	Good Triples brute force, combinatorics, number theory	1600	x15743
1907D	Jumping Through Segments binary search, constructive algorithms	1400	x23492
1906M	Triangle Construction greedy, math	1700	x3449
1906E	Merge Not Sort constructive algorithms, dp	1900	x2411
1905C	Largest Subsequence greedy, strings	1400	x14193
1904D2	Set To Max (Hard Version) constructive algorithms, data structures, divide and conquer, greedy, implementation, sortings	1800	x5680
1904D1	Set To Max (Easy Version) brute force, constructive algorithms, greedy	1600	x8601
1904C	Array Game binary search, brute force, data structures, sortings, two pointers	1400	x23478
1903D1	Maximum And Queries (easy version) binary search, bitmasks, brute force, greedy	1700	x7106
1903C	Theofanis' Nightmare constructive algorithms, greedy	1400	x14451
1902E	Collapsing Strings data structures, strings, trees	1900	x5598
1902D	Robot Queries binary search, data structures, dp, implementation	1900	x5290
1902C	Insert and Equalize brute force, constructive algorithms, greedy, math, number theory	1300	x16949
1901D	Yet Another Monster Fight binary search, dp, greedy, implementation, math	1700	x8577
1901C	Add, Divide and Floor constructive algorithms, greedy, math	1400	x14224
1900C	Anji's Binary Tree dfs and similar, dp, trees	1300	x15014
1899G	Unusual Entertainment data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers	1900	x4011
1899F	Alex's whims constructive algorithms, graphs, greedy, shortest paths, trees	1600	x9503
1899E	Queue Sort greedy, implementation, sortings	1300	x18239
1899D	Yarik and Musical Notes hashing, math, number theory	1300	x15626
1898D	Absolute Beauty greedy, math	1900	x6616
1898C	Colorful Grid constructive algorithms	1700	x6502
1898B	Milena and Admirer greedy, math	1500	x14592
1896D	Ones and Twos binary search, data structures, divide and conquer, math, two pointers	1700	x6998
1896C	Matching Arrays binary search, constructive algorithms, greedy, sortings	1400	x11587
1895D	XOR Construction bitmasks, constructive algorithms, data structures, math, string suffix structures, trees	1900	x7119
1895C	Torn Lucky Ticket brute force, dp, hashing, implementation, math	1400	x13019
1893B	Neutral Tonality constructive algorithms, greedy, sortings, two pointers	1700	x11440
1893A	Anonymous Informant brute force, dfs and similar, graphs, implementation	1400	x15063
1891D	Suspicious logarithms binary search, brute force, math	1900	x4554
1891C	Smilo and Monsters binary search, constructive algorithms, greedy, sortings, two pointers	1500	x20276
1889B	Doremy's Connecting Plan constructive algorithms, greedy, math, sortings	1700	x8612
1889A	Qingshan Loves Strings 2 constructive algorithms, greedy, implementation	1300	x15281
1887B	Time Travel binary search, graphs, shortest paths	1900	x3892
1886C	Decreasing String implementation, strings	1600	x16539
1884C	Medium Design brute force, data structures, dp, greedy, sortings	1700	x7344
1883G2	Dances (Hard Version) binary search, greedy, sortings, two pointers	1900	x6726
1883G1	Dances (Easy version) binary search, greedy, two pointers	1400	x19473
1883F	You Are So Beautiful data structures	1400	x11846
1883E	Look Back bitmasks, greedy	1700	x9901
1883D	In Love data structures, greedy	1500	x14502
1882D	Tree XOR bitmasks, dfs and similar, dp, greedy, trees	1900	x7078
1882C	Card Game brute force, greedy	1500	x14444
1882B	Sets and Union bitmasks, brute force, constructive algorithms, greedy	1300	x17399
1881F	Minimum Maximum Distance dfs and similar, dp, graphs, shortest paths, trees	1700	x9548
1881E	Block Sequence dp	1500	x23537
1881D	Divide and Equalize math, number theory	1300	x28315
1879D	Sum of XOR Functions bitmasks, combinatorics, divide and conquer, dp, math	1700	x10426
1879C	Make it Alternating combinatorics, dp, greedy	1300	x26996
1878F	Vasilije Loves Number Theory brute force, math, number theory	1900	x4927
1878E	Iva & Pav binary search, bitmasks, data structures, greedy	1400	x20873
1878D	Reverse Madness data structures, greedy	1600	x10091
1876B	Effects of Anti Pimples combinatorics, number theory, sortings	1500	x10017
1875D	Jellyfish and Mex dp	1600	x11378
1875C	Jellyfish and Green Apple bitmasks, greedy, math, number theory	1400	x13863
1873H	Mad City dfs and similar, dsu, games, graphs, shortest paths, trees	1700	x9488
1873G	ABBC or BACB constructive algorithms, greedy	1500	x16805
1873F	Money Trees binary search, greedy, math, two pointers	1300	x19666
1872F	Selling a Menagerie dfs and similar, dsu, graphs, implementation, math	1800	x7524
1872E	Data Structures Fan binary search, bitmasks, data structures, dp	1500	x21293
1870D	Prefix Purchase greedy, implementation, sortings	1800	x8024
1870C	Colorful Table binary search, data structures, dp, implementation, math, two pointers	1300	x13097
1868B1	Candy Party (Easy Version) bitmasks, constructive algorithms, graphs, greedy, implementation, math	1700	x8313
1868A	Fill in the Matrix constructive algorithms, implementation	1300	x13602
1867D	Cyclic Operations brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation	1800	x6870
1867C	Salyg1n and the MEX Game constructive algorithms, data structures, games, greedy, interactive	1300	x12664
1866C	Completely Searching for Inversions dfs and similar, dp, graphs	1900	x3426
1866B	Battling with Numbers combinatorics, math, number theory	1400	x9169
1864D	Matrix Cascade brute force, constructive algorithms, data structures, dp, greedy, math	1700	x7629
1864C	Divisor Chain bitmasks, constructive algorithms, math, number theory	1300	x15273

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