Problemset - Codeforces

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Codeforces Round sponsored by NEAR (Div. 1 + Div. 2)
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Problems

#	Name
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5210
1647A	Madoka and Math Dad implementation, math	800	x22628
1646E	Power Board brute force, dp, math, number theory	2200	x2335
1646C	Factorials and Powers of Two bitmasks, brute force, constructive algorithms, dp, math	1500	x13649
1646A	Square Counting math	800	x24116
1644F	Basis combinatorics, fft, math, number theory	2900	x318
1644E	Expand the Path brute force, combinatorics, data structures, implementation, math	1900	x3051
1644D	Cross Coloring data structures, implementation, math	1700	x7079
1641E	Special Positions combinatorics, divide and conquer, fft, math	3300	x205
1641D	Two Arrays bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers	2700	x1071
1638C	Inversion Graph data structures, dsu, graphs, math	1300	x14543
1638B	Odd Swap Sort data structures, math, sortings	1100	x20651
1638A	Reverse constructive algorithms, greedy, math	800	x21356
1637H	Minimize Inversions Number data structures, greedy, math, sortings	3500	x309
1637G	Birthday constructive algorithms, greedy, math	3000	x497
1637D	Yet Another Minimization Problem dp, greedy, math	1800	x7505
1637B	MEX and Array brute force, dp, greedy, math	1100	x14722
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6122
1634F	Fibonacci Additions brute force, data structures, hashing, implementation, math	2700	x1544
1634D	Finding Zero constructive algorithms, interactive, math	2000	x4275
1634B	Fortune Telling bitmasks, math	1400	x16094
1633E	Spanning Tree Queries binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees	2400	x1478
1633C	Kill the Monster brute force, math	1100	x19813
1632D	New Year Concert binary search, data structures, greedy, math, number theory, two pointers	2000	x4555
1632C	Strange Test binary search, bitmasks, brute force, dp, math	1600	x12494
1630E	Expected Components combinatorics, math, number theory, probabilities	2900	x432
1629B	GCD Arrays greedy, math, number theory	800	x23180
1628D2	Game on Sum (Hard Version) combinatorics, dp, games, math	2400	x2015
1628D1	Game on Sum (Easy Version) combinatorics, dp, games, math	2100	x3068
1628C	Grid Xor constructive algorithms, greedy, implementation, interactive, math	2300	x3118
1628A	Meximum Array binary search, constructive algorithms, greedy, implementation, math, two pointers	1400	x15397
1627D	Not Adding brute force, dp, math, number theory	1900	x8034
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x721
1626D	Martial Arts Tournament binary search, brute force, greedy, math	2100	x3843
1626C	Monsters And Spells binary search, data structures, dp, greedy, implementation, math, two pointers	1700	x10756
1625D	Binary Spiders bitmasks, data structures, implementation, math, sortings, trees	2300	x2006
1625A	Ancient Civilization bitmasks, greedy, math	800	x17080
1624C	Division by Two and Permutation constructive algorithms, flows, graph matchings, greedy, math	1100	x24459
1624B	Make AP implementation, math	900	x35399
1624A	Plus One on the Subset math	800	x50813
1623D	Robot Cleaner Revisit implementation, math, probabilities	2300	x1358
1623A	Robot Cleaner brute force, implementation, math	800	x19968
1622F	Quadratic Set constructive algorithms, hashing, math, number theory	2900	x607
1622D	Shuffle combinatorics, math, two pointers	2000	x3948
1622B	Berland Music data structures, greedy, math, sortings	1000	x20742
1622A	Construct a Rectangle geometry, math	800	x29745
1621G	Weighted Increasing Subsequences data structures, dp, math	3200	x636
1621D	The Winter Hike constructive algorithms, greedy, math	2100	x4005
1621C	Hidden Permutations dfs and similar, interactive, math	1700	x6813
1620C	BA-String brute force, dp, greedy, implementation, math	1800	x6451
1620B	Triangles on a Rectangle geometry, greedy, math	1000	x20297
1619F	Let's Play the Hat? brute force, constructive algorithms, greedy, math	2000	x2062
1619E	MEX and Increments constructive algorithms, data structures, dp, greedy, implementation, math, sortings	1700	x8958
1619B	Squares and Cubes implementation, math	800	x30453
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4136
1618E	Singers' Tour constructive algorithms, math	1700	x7056
1618D	Array and Operations dp, greedy, math	1300	x18611
1618C	Paint the Array math	1100	x22251
1618A	Polycarp and Sums of Subsequences math, sortings	800	x31983
1617E	Christmas Chocolates dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees	2700	x847
1617D2	Too Many Impostors (hard version) constructive algorithms, implementation, interactive, math	2400	x1744
1617C	Paprika and Permutation binary search, greedy, math, sortings	1300	x14797
1617B	GCD Problem brute force, constructive algorithms, math, number theory	900	x22863
1616H	Keep XOR Low bitmasks, combinatorics, data structures, divide and conquer, dp, math	3000	x817
1616F	Tricolor Triangles brute force, graphs, math, matrices	2900	x587
1616D	Keep the Average High dp, greedy, math	2000	x4800
1616C	Representative Edges brute force, geometry, implementation, math	1500	x12108
1615F	LEGOndary Grandmaster combinatorics, dp, math	2800	x828
1615E	Purple Crayon data structures, dfs and similar, games, graphs, greedy, math, sortings, trees	2400	x1420
1615C	Menorah brute force, graphs, greedy, math	1600	x8254
1615B	And It's Non-Zero bitmasks, greedy, math	1300	x15531
1615A	Closing The Gap greedy, math	800	x20628
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x10089
1613D	MEX Sequences dp, math	1900	x4510
1613A	Long Comparison implementation, math	900	x24225
1612D	X-Magic Pair math, number theory	1600	x8975
1612C	Chat Ban binary search, math	1300	x16501
1611B	Team Composition: Programmers and Mathematicians binary search, constructive algorithms, math	800	x29054
1611A	Make Even constructive algorithms, math	800	x31079
1610E	AmShZ and G.O.A.T. binary search, brute force, greedy, implementation, math	2300	x1644
1610D	Not Quite Lee combinatorics, dp, math, number theory	2000	x2652
1610A	Anti Light's Cell Guessing math	900	x15959
1609G	A Stroll Around the Matrix data structures, greedy, math	3000	x372
1609A	Divide and Multiply greedy, implementation, math, number theory	900	x16887
1608D	Dominoes combinatorics, fft, graphs, math, number theory	2400	x1362
1608A	Find Array constructive algorithms, math	800	x18875
1607D	Blue-Red Permutation greedy, math, sortings	1300	x16594
1607B	Odd Grasshopper math	900	x25380
1606E	Arena combinatorics, dp, math	2100	x3433
1606B	Update Files greedy, implementation, math	1100	x18497
1605E	Array Equalizer binary search, greedy, implementation, math, number theory, sortings, two pointers	2400	x1015
1605A	A.M. Deviation math, number theory	800	x20486
1603F	October 18, 2017 combinatorics, dp, implementation, math	2700	x271
1603E	A Perfect Problem combinatorics, dp, math	3200	x410
1603C	Extreme Extension dp, greedy, math, number theory	2300	x2002
1603B	Moderate Modular Mode constructive algorithms, math, number theory	1600	x13284
1603A	Di-visible Confusion constructive algorithms, math, number theory	1300	x16391
1601F	Two Sorts binary search, dfs and similar, math, meet-in-the-middle	3400	x172
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x13934
1600F	Party Organization brute force, math, probabilities	2300	x466