Problemset - Codeforces

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Codeforces Round 950 (Div. 3)
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combinatorics

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Problems

#	Name
1976E	Splittable Permutations combinatorics, data structures, dfs and similar, greedy, math, trees		x493
1976D	Invertible Bracket Sequences binary search, combinatorics, data structures, divide and conquer, implementation, two pointers		x2396
1975F	Set bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math	2600	x515
1974C	Beautiful Triple Pairs combinatorics, data structures	1400	x12167
1967E2	Again Counting Arrays (Hard Version) combinatorics, dp, math	3500	x68
1967E1	Again Counting Arrays (Easy Version) combinatorics, dp, fft, math	3100	x142
1967C	Fenwick Tree bitmasks, brute force, combinatorics, data structures, dp, math, trees	2300	x1393
1958F	Narrow Paths *special problem, combinatorics	2000	x153
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x1052
1957C	How Does the Rook Move? combinatorics, dp, math	1600	x8096
1954F	Unique Strings combinatorics, dp, math	3100	x215
1954D	Colored Balls combinatorics, dp, math, sortings	1800	x5165
1952E	Sweep Line combinatorics, games, math		x214
1951G	Clacking Balls combinatorics, math, probabilities	3100	x269
1948F	Rare Coins combinatorics, math, probabilities	2500	x1173
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2164
1943D2	Counting Is Fun (Hard Version) combinatorics, dp	2800	x624
1943D1	Counting Is Fun (Easy Version) brute force, combinatorics, dp, math	2400	x1287
1942G	Bessie and Cards combinatorics, dp, math	2800	x381
1942E	Farm Game combinatorics, games	2300	x1480
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x7461
1933G	Turtle Magic: Royal Turtle Shell Pattern bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math	2300	x894
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2491
1931F	Chat Screenshots combinatorics, dfs and similar, graphs	1700	x7089
1931D	Divisible Pairs combinatorics, math, number theory	1300	x16267
1930I	Counting Is Fun combinatorics	3500	x55
1930E	2..3...4.... Wonderful! Wonderful! combinatorics, dp, math	2400	x1013
1929F	Sasha and the Wedding Binary Search Tree brute force, combinatorics, data structures, dfs and similar, math, trees	2300	x1661
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4249
1928F	Digital Patterns combinatorics, data structures, implementation, math	2900	x215
1925D	Good Trip combinatorics, dp, math, probabilities	1900	x3289
1924E	Paper Cutting Again combinatorics, probabilities	3100	x398
1924D	Balanced Subsequences combinatorics, dp, math	2700	x790
1922B	Forming Triangles combinatorics, constructive algorithms, math, sortings	1200	x19275
1920E	Counting Binary Strings combinatorics, dp, math	2100	x2409
1919E	Counting Prefixes combinatorics, constructive algorithms, dp, implementation, math	2600	x786
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1678
1917B	Erase First or Second Letter brute force, combinatorics, data structures, dp, strings	1100	x19762
1916H2	Matrix Rank (Hard Version) combinatorics, dp, math, matrices, string suffix structures	2700	x503
1916H1	Matrix Rank (Easy Version) brute force, combinatorics, dp, math, matrices	2700	x585
1914G2	Light Bulbs (Hard Version) combinatorics, data structures, dfs and similar, dp, graphs, hashing	2300	x1240
1914G1	Light Bulbs (Easy Version) brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees	2100	x1699
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x2097
1912B	Blueprint for Seating combinatorics, divide and conquer, math	2100	x946
1910I	Inverse Problem *special problem, combinatorics, dp	2700	x43
1909I	Short Permutation Problem combinatorics, dp, fft, math	1900	x98
1909F2	Small Permutation Problem (Hard Version) combinatorics, dp, math	2500	x840
1909F1	Small Permutation Problem (Easy Version) brute force, combinatorics, dp, math	2200	x1655
1907E	Good Triples brute force, combinatorics, number theory	1600	x8997
1906J	Count BFS Graph combinatorics, dp	2100	x654
1906H	Twin Friends combinatorics, dp	2200	x620
1905E	One-X combinatorics, dfs and similar, dp, math, trees	2400	x866
1895F	Fancy Arrays combinatorics, dp, math, matrices	2600	x641
1893E	Cacti Symphony combinatorics, dfs and similar, dp, graphs	3500	x181
1886D	Monocarp and the Set combinatorics, data structures, math	2100	x3363
1879D	Sum of XOR Functions bitmasks, combinatorics, divide and conquer, dp, math	1700	x6701
1879C	Make it Alternating combinatorics, dp, greedy	1300	x15214
1876D	Lexichromatography combinatorics, dfs and similar, dsu, graphs, two pointers	2500	x826
1876B	Effects of Anti Pimples combinatorics, number theory, sortings	1500	x7616
1868C	Travel Plan combinatorics, dp, implementation, math, trees	2400	x1093
1866M	Mighty Rock Tower brute force, combinatorics, dp, math, probabilities	2400	x698
1866H	Happy Sets combinatorics	2100	x1542
1866B	Battling with Numbers combinatorics, math, number theory	1400	x7282
1864G	Magic Square combinatorics, constructive algorithms, implementation	3100	x255
1863G	Swaps combinatorics, dp, graphs, math	2800	x578
1862D	Ice Cream Balls binary search, combinatorics, constructive algorithms, math	1300	x16220
1861E	Non-Intersecting Subpermutations combinatorics, dp, implementation, math	2300	x1633
1857G	Counting Graphs combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees	2000	x4141
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x24225
1854C	Expected Destruction combinatorics, dp, math, probabilities	2500	x1412
1850G	The Morning Star combinatorics, data structures, geometry, implementation, math, sortings	1500	x11398
1848F	Vika and Wiki binary search, bitmasks, combinatorics, divide and conquer, dp, math	2400	x1466
1847E	Triangle Platinum? brute force, combinatorics, implementation, interactive, math, probabilities	2900	x319
1844H	Multiple of Three Cycles combinatorics, data structures, dp, dsu, math	3400	x133
1843D	Apple Tree combinatorics, dfs and similar, dp, math, trees	1200	x17176
1843C	Sum in Binary Tree bitmasks, combinatorics, math, trees	800	x31353
1842G	Tenzing and Random Operations combinatorics, dp, math, probabilities	2800	x941
1840C	Ski Resort combinatorics, math, two pointers	1000	x25029
1840B	Binary Cafe bitmasks, combinatorics, math	1100	x21640
1838E	Count Supersequences combinatorics, dp, math	2500	x1381
1837E	Playoff Fixing combinatorics, trees	2200	x2119
1835E	Old Mobile combinatorics, dp, probabilities	3500	x204
1833F	Ira and Flamenco combinatorics, constructive algorithms, data structures, implementation, math, sortings, two pointers	1700	x6817
1832E	Combinatorics Problem brute force, combinatorics, dp	2200	x2069
1830C	Hyperregular Bracket Strings combinatorics, greedy, hashing, math, number theory, sortings	2400	x1542
1829H	Don't Blame Me bitmasks, combinatorics, dp, math	1700	x7167
1827A	Counting Orders combinatorics, math, sortings, two pointers	1100	x17655
1824B2	LuoTianyi and the Floating Islands (Hard Version) combinatorics, dfs and similar, math, probabilities, trees	2300	x2509
1824B1	LuoTianyi and the Floating Islands (Easy Version) combinatorics, math, probabilities, trees	1800	x4364
1823A	A-characteristic combinatorics, constructive algorithms, math	800	x15856
1821F	Timber combinatorics, dp, fft, math	2600	x714
1821A	Matching combinatorics, math	800	x19430
1817C	Similar Polynomials combinatorics, math	2400	x932
1815D	XOR Counting bitmasks, combinatorics, dp, math	2600	x1060
1811G2	Vlad and the Nice Paths (hard version) binary search, combinatorics, data structures, dp, math, two pointers	2200	x1642
1811G1	Vlad and the Nice Paths (easy version) combinatorics, dp, math	2100	x1935
1810H	Last Number combinatorics, math	2900	x132
1809G	Prediction combinatorics, dp, math	2800	x422
1808E3	Minibuses on Venus (hard version) brute force, combinatorics, dp, math	2800	x424
1808E2	Minibuses on Venus (medium version) combinatorics, divide and conquer, dp, matrices	2500	x655

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