Problemset - Codeforces

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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
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Problems

#	Name
1561D1	Up the Strip (simplified version) brute force, data structures, dp, math, number theory	1700	x5655
1560D	Make a Power of Two greedy, math, strings	1300	x18283
1560C	Infinity Table implementation, math	800	x26727
1560B	Who's Opposite? math	800	x35948
1559E	Mocha and Stars combinatorics, dp, fft, math, number theory	2200	x2332
1559A	Mocha and Math bitmasks, constructive algorithms, math	900	x31974
1558B	Up the Strip brute force, dp, math, number theory, two pointers	1900	x4832
1558A	Charmed by the Game brute force, math	1300	x11123
1557C	Moamen and XOR bitmasks, combinatorics, dp, math, matrices	1700	x8661
1557A	Ezzat and Two Subsequences brute force, math, sortings	800	x27999
1556H	DIY Tree graphs, greedy, math, probabilities	3300	x376
1556F	Sports Betting bitmasks, combinatorics, dp, graphs, math, probabilities	2500	x1264
1556D	Take a Guess bitmasks, constructive algorithms, interactive, math	1800	x7058
1556A	A Variety of Operations math	800	x18117
1555A	PizzaForces brute force, math	900	x28275
1554E	You dfs and similar, dp, math, number theory	2600	x1237
1554B	Cobb bitmasks, brute force, greedy, math	1700	x12872
1553I	Stairs combinatorics, divide and conquer, dp, fft, math	3400	x205
1553G	Common Divisor Graph brute force, constructive algorithms, dsu, graphs, hashing, math, number theory	2700	x1051
1553F	Pairwise Modulo data structures, math	2300	x2241
1553E	Permutation Shift brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math	2100	x3366
1553A	Digits Sum math, number theory	800	x31264
1552I	Organizing a Music Festival dfs and similar, math	3400	x130
1552D	Array Differentiation bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math	1800	x7087
1551D2	Domino (hard version) constructive algorithms, implementation, math	2100	x2780
1551D1	Domino (easy version) constructive algorithms, math	1700	x7136
1551A	Polycarp and Coins greedy, math	800	x51516
1550D	Excellent Arrays binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers	2300	x1858
1550B	Maximum Cost Deletion greedy, math	1000	x26602
1550A	Find The Array greedy, math	800	x28228
1549A	Gregor and Cryptography math, number theory	800	x32748
1548E	Gregor and the Two Painters data structures, divide and conquer, graphs, greedy, math	3400	x463
1548D2	Gregor and the Odd Cows (Hard) brute force, geometry, math, number theory	3300	x265
1548D1	Gregor and the Odd Cows (Easy) bitmasks, geometry, math, number theory	2300	x1478
1548C	The Three Little Pigs combinatorics, dp, fft, math	2500	x1844
1548B	Integers Have Friends binary search, data structures, divide and conquer, math, number theory, two pointers	1800	x9990
1547A	Shortest Path with Obstacle implementation, math	800	x30592
1546B	AquaMoon and Stolen String interactive, math	1200	x13203
1545D	AquaMoon and Wrong Coordinate constructive algorithms, interactive, math	3000	x499
1545B	AquaMoon and Chess combinatorics, math	1900	x6007
1543E	The Final Pursuit bitmasks, constructive algorithms, divide and conquer, graphs, greedy, math	2700	x414
1543D2	RPD and Rap Sheet (Hard Version) brute force, constructive algorithms, interactive, math	2200	x2025
1543D1	RPD and Rap Sheet (Easy Version) bitmasks, constructive algorithms, interactive, math	1700	x7645
1543C	Need for Pink Slips bitmasks, brute force, dfs and similar, implementation, math, probabilities	1900	x5317
1543B	Customising the Track combinatorics, greedy, math	900	x23240
1543A	Exciting Bets greedy, math, number theory	900	x28741
1542E2	Abnormal Permutation Pairs (hard version) combinatorics, dp, fft, math	2700	x866
1542E1	Abnormal Permutation Pairs (easy version) combinatorics, dp, fft, math	2400	x1256
1542D	Priority Queue combinatorics, dp, implementation, math, ternary search	2200	x2665
1542C	Strange Function math, number theory	1600	x14347
1542B	Plus and Multiply constructive algorithms, math, number theory	1500	x23370
1542A	Odd Set math	800	x45263
1541B	Pleasant Pairs brute force, implementation, math, number theory	1200	x29001
1540E	Tasty Dishes math, matrices	3500	x107
1540C2	Converging Array (Hard Version) dp, math	2900	x472
1540C1	Converging Array (Easy Version) dp, math	2700	x639
1540B	Tree Array brute force, combinatorics, dp, graphs, math, probabilities, trees	2300	x2658
1539A	Contest Start combinatorics, geometry, greedy, math	1000	x20223
1538G	Gift Set binary search, greedy, math, ternary search	2100	x4590
1538F	Interesting Function binary search, dp, math, number theory	1500	x19457
1538D	Another Problem About Dividing Numbers constructive algorithms, math, number theory	1700	x13735
1538C	Number of Pairs binary search, data structures, math, two pointers	1300	x28951
1538B	Friends and Candies greedy, math	800	x31787
1537F	Figure Fixing constructive algorithms, dfs and similar, dsu, graphs, greedy, math	2200	x2494
1537D	Deleting Divisors games, math, number theory	1700	x12510
1537C	Challenging Cliffs constructive algorithms, greedy, implementation, math	1200	x27891
1537B	Bad Boy constructive algorithms, greedy, math	900	x30469
1537A	Arithmetic Array greedy, math	800	x37552
1536F	Omkar and Akmar chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures	2600	x964
1536E	Omkar and Forest combinatorics, graphs, math, shortest paths	2300	x2449
1535B	Array Reodering brute force, greedy, math, number theory, sortings	900	x30780
1534C	Little Alawn's Puzzle combinatorics, dp, dsu, graphs, math	1300	x12880
1534B	Histogram Ugliness greedy, implementation, math	1100	x12530
1533A	Travel to Bertown *special problem, implementation, math		x1077
1532B	Frog Jumping *special problem, math		x824
1530F	Bingo bitmasks, combinatorics, dp, math, probabilities	2600	x829
1530D	Secret Santa constructive algorithms, flows, graphs, greedy, math	1600	x9286
1530A	Binary Decimal greedy, math	800	x21135
1529B	Sifid and Strange Subsequences greedy, math, sortings	1100	x20620
1529A	Eshag Loves Big Arrays constructive algorithms, greedy, math	800	x29853
1528F	AmShZ Farm combinatorics, fft, math	3300	x289
1528B	Kavi on Pairing Duty combinatorics, dp, math	1700	x8767
1527D	MEX Tree combinatorics, dfs and similar, implementation, math, trees	2400	x1923
1527C	Sequence Pair Weight hashing, implementation, math	1600	x13652
1526E	Oolimry and Suffix Array combinatorics, constructive algorithms, math	2400	x1067
1526D	Kill Anton brute force, constructive algorithms, data structures, math, strings	2200	x2484
1526B	I Hate 1111 dp, math, number theory	1400	x31064
1525E	Assimilation IV combinatorics, dp, math, probabilities, two pointers	2100	x2081
1525A	Potion-making math, number theory	800	x25673
1523E	Crypto Lights combinatorics, dp, math, probabilities	2600	x1698
1521B	Nastia and a Good Array constructive algorithms, math, number theory	1300	x21480
1521A	Nastia and Nearly Good Numbers constructive algorithms, math, number theory	1000	x37567
1520E	Arranging The Sheep greedy, math	1400	x21747
1520D	Same Differences data structures, hashing, math	1200	x47935
1520B	Ordinary Numbers brute force, math, number theory	800	x44852
1519D	Maximum Sum of Products brute force, dp, implementation, math, two pointers	1600	x15425
1519B	The Cake Is a Lie dp, math	800	x31072
1519A	Red and Blue Beans math	800	x29035
1517A	Sum of 2050 greedy, math	800	x25622
1516E	Baby Ehab Plays with Permutations combinatorics, dp, math	2500	x885