Problemset - Codeforces

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Codeforces Round 973 (Div. 2)
15:59:35
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combinatorics

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Problems

#	Name
2008F	Sakurako's Box combinatorics, math, number theory	1400	x10939
2006F	Dora's Paint brute force, combinatorics, constructive algorithms, graphs, implementation	3500	x82
2005A	Simple Palindrome combinatorics, constructive algorithms, greedy		x18141
2001E2	Deterministic Heap (Hard Version) combinatorics, dp, trees	2900	x180
2001E1	Deterministic Heap (Easy Version) combinatorics, dp, math, trees	2400	x1119
2000E	Photoshoot for Gorillas combinatorics, data structures, greedy, math	1400	x12303
1999F	Expected Median combinatorics, math	1500	x9536
1997F	Chips on a Line brute force, combinatorics, dp, greedy, math	2700	x830
1996E	Decode combinatorics, data structures, implementation, math	1600	x8921
1996D	Fun binary search, brute force, combinatorics, math, number theory	1500	x14834
1994H	Fortnite combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings	3500	x490
1992G	Ultra-Meow combinatorics, dp, math	2000	x2894
1989E	Distance to Different combinatorics, dp, math	2300	x1841
1988F	Heartbeat combinatorics, dp, fft, math	3000	x180
1986G1	Permutation Problem (Simple Version) binary search, brute force, combinatorics, data structures, math, number theory	2200	x1398
1985G	D-Function combinatorics, math, number theory	1600	x8902
1985E	Secret Box brute force, combinatorics, math	1200	x19290
1984H	Tower Capturing combinatorics, dp, geometry	3300	x164
1984C2	Magnitude (Hard Version) combinatorics, dp, greedy, math	1700	x7034
1983E	I Love Balls combinatorics, math, probabilities	2300	x1891
1982E	Number of k-good subarrays bitmasks, brute force, combinatorics, divide and conquer, dp, math, meet-in-the-middle	2300	x1499
1979C	Earning on Bets binary search, combinatorics, constructive algorithms, number theory	1200	x18163
1976E	Splittable Permutations combinatorics, data structures, dfs and similar, greedy, math, trees	2500	x988
1976D	Invertible Bracket Sequences binary search, combinatorics, data structures, divide and conquer, implementation, two pointers	2000	x4144
1975F	Set bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math	2600	x784
1974C	Beautiful Triple Pairs combinatorics, data structures	1400	x15298
1967E2	Again Counting Arrays (Hard Version) combinatorics, dp, math	3500	x99
1967E1	Again Counting Arrays (Easy Version) combinatorics, dp, fft, math	3100	x209
1967C	Fenwick Tree bitmasks, brute force, combinatorics, data structures, dp, math, trees	2300	x1666
1958F	Narrow Paths *special problem, combinatorics	2000	x188
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x1218
1957C	How Does the Rook Move? combinatorics, dp, math	1600	x9373
1954F	Unique Strings combinatorics, dp, math	3100	x242
1954D	Colored Balls combinatorics, dp, math, sortings	1800	x5916
1952E	Sweep Line combinatorics, games, math		x247
1951G	Clacking Balls combinatorics, math, probabilities	3100	x328
1948F	Rare Coins combinatorics, math, probabilities	2500	x1276
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2476
1943D2	Counting Is Fun (Hard Version) combinatorics, dp	2800	x718
1943D1	Counting Is Fun (Easy Version) brute force, combinatorics, dp, math	2400	x1423
1942G	Bessie and Cards combinatorics, dp, math	2800	x428
1942E	Farm Game combinatorics, games	2300	x1627
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x8080
1933G	Turtle Magic: Royal Turtle Shell Pattern bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math	2300	x958
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2755
1931F	Chat Screenshots combinatorics, dfs and similar, graphs	1700	x7878
1931D	Divisible Pairs combinatorics, math, number theory	1300	x18396
1930I	Counting Is Fun combinatorics	3500	x69
1930E	2..3...4.... Wonderful! Wonderful! combinatorics, dp, math	2400	x1109
1929F	Sasha and the Wedding Binary Search Tree brute force, combinatorics, data structures, dfs and similar, math, trees	2300	x1762
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4670
1928F	Digital Patterns combinatorics, data structures, implementation, math	2900	x237
1925D	Good Trip combinatorics, dp, math, probabilities	1900	x3565
1924E	Paper Cutting Again combinatorics, probabilities	3100	x425
1924D	Balanced Subsequences combinatorics, dp, math	2700	x964
1922B	Forming Triangles combinatorics, constructive algorithms, math, sortings	1200	x20362
1920E	Counting Binary Strings combinatorics, dp, math	2100	x2651
1919E	Counting Prefixes combinatorics, constructive algorithms, dp, implementation, math	2600	x840
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1766
1917B	Erase First or Second Letter brute force, combinatorics, data structures, dp, strings	1100	x21839
1916H2	Matrix Rank (Hard Version) combinatorics, dp, math, matrices, string suffix structures	2700	x527
1916H1	Matrix Rank (Easy Version) brute force, combinatorics, dp, math, matrices	2700	x607
1914G2	Light Bulbs (Hard Version) combinatorics, data structures, dfs and similar, dp, graphs, hashing	2300	x1330
1914G1	Light Bulbs (Easy Version) brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees	2100	x1817
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x2383
1912B	Blueprint for Seating combinatorics, divide and conquer, math	2100	x1006
1910I	Inverse Problem *special problem, combinatorics, dp	2700	x49
1909I	Short Permutation Problem combinatorics, dp, fft, math	1900	x118
1909F2	Small Permutation Problem (Hard Version) combinatorics, dp, math	2500	x900
1909F1	Small Permutation Problem (Easy Version) brute force, combinatorics, dp, math	2200	x1760
1907E	Good Triples brute force, combinatorics, number theory	1600	x10053
1906J	Count BFS Graph combinatorics, dp	2100	x750
1906H	Twin Friends combinatorics, dp	2200	x687
1905E	One-X combinatorics, dfs and similar, dp, math, trees	2400	x940
1895F	Fancy Arrays combinatorics, dp, math, matrices	2600	x751
1893E	Cacti Symphony combinatorics, dfs and similar, dp, graphs	3500	x189
1886D	Monocarp and the Set combinatorics, data structures, math	2100	x3542
1879D	Sum of XOR Functions bitmasks, combinatorics, divide and conquer, dp, math	1700	x7289
1879C	Make it Alternating combinatorics, dp, greedy	1300	x16763
1876D	Lexichromatography combinatorics, dfs and similar, dsu, graphs, two pointers	2500	x871
1876B	Effects of Anti Pimples combinatorics, number theory, sortings	1500	x8196
1868C	Travel Plan combinatorics, dp, implementation, math, trees	2400	x1135
1866M	Mighty Rock Tower brute force, combinatorics, dp, math, probabilities	2400	x757
1866H	Happy Sets combinatorics	2100	x1631
1866B	Battling with Numbers combinatorics, math, number theory	1400	x7664
1864G	Magic Square combinatorics, constructive algorithms, implementation	3100	x263
1863G	Swaps combinatorics, dp, graphs, math	2800	x607
1862D	Ice Cream Balls binary search, combinatorics, constructive algorithms, math	1300	x17100
1861E	Non-Intersecting Subpermutations combinatorics, dp, implementation, math	2300	x1705
1857G	Counting Graphs combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees	2000	x4415
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x26390
1854C	Expected Destruction combinatorics, dp, math, probabilities	2500	x1465
1850G	The Morning Star combinatorics, data structures, geometry, implementation, math, sortings	1500	x12303
1848F	Vika and Wiki binary search, bitmasks, combinatorics, divide and conquer, dp, math	2400	x1532
1847E	Triangle Platinum? brute force, combinatorics, implementation, interactive, math, probabilities	2900	x328
1844H	Multiple of Three Cycles combinatorics, data structures, dp, dsu, math	3400	x137
1843D	Apple Tree combinatorics, dfs and similar, dp, math, trees	1200	x17939
1843C	Sum in Binary Tree bitmasks, combinatorics, math, trees	800	x32867
1842G	Tenzing and Random Operations combinatorics, dp, math, probabilities	2800	x1022
1840C	Ski Resort combinatorics, math, two pointers	1000	x27464

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