Problemset - Codeforces

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Codeforces Round (Div. 2)
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number theory

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Problems

#	Name
519C	A and B and Team Training greedy, implementation, math, number theory	1300	x19426
516E	Drazil and His Happy Friends math, number theory	3100	x483
515B	Drazil and His Happy Friends brute force, dsu, meet-in-the-middle, number theory	1300	x7385
500G	New Year Running number theory, trees	3200	x157
498D	Traffic Jams in the Land data structures, dp, number theory	2400	x1082
498C	Array and Operations flows, graph matchings, number theory	2100	x3348
495B	Modular Equations math, number theory	1600	x6670
490D	Chocolate brute force, dfs and similar, math, meet-in-the-middle, number theory	1900	x2074
490C	Hacking Cypher brute force, math, number theory, strings	1700	x8976
487C	Prefix Product Sequence constructive algorithms, math, number theory	2300	x2586
483A	Counterexample brute force, implementation, math, number theory	1100	x22531
474F	Ant colony data structures, math, number theory	2100	x8081
472A	Design Tutorial: Learn from Math math, number theory	800	x58054
463E	Caisa and Tree brute force, dfs and similar, math, number theory, trees	2100	x1533
460B	Little Dima and Equation brute force, implementation, math, number theory	1500	x12183
456B	Fedya and Maths math, number theory	1200	x16232
451E	Devu and Flowers bitmasks, combinatorics, number theory	2300	x3371
449E	Jzzhu and Squares dp, math, number theory	2900	x285
449C	Jzzhu and Apples constructive algorithms, number theory	2500	x2215
448E	Divisors brute force, dfs and similar, implementation, number theory	2200	x1453
446C	DZY Loves Fibonacci Numbers data structures, math, number theory	2400	x3219
439C	Devu and Partitioning of the Array brute force, constructive algorithms, implementation, number theory	1700	x3811
438E	The Child and Binary Tree combinatorics, divide and conquer, fft, number theory	3100	x1822
414B	Mashmokh and ACM combinatorics, dp, number theory	1400	x21331
414A	Mashmokh and Numbers constructive algorithms, number theory	1500	x9692
402D	Upgrading Array dp, greedy, math, number theory	1800	x2531
401D	Roman and Numbers bitmasks, brute force, combinatorics, dp, number theory	2000	x4016
396B	On Sum of Fractions math, number theory		x1058
396A	On Number of Decompositions into Multipliers combinatorics, math, number theory		x1464
385C	Bear and Prime Numbers binary search, brute force, data structures, dp, implementation, math, number theory	1700	x9478
375A	Divisible by Seven math, number theory	1600	x4704
371B	Fox Dividing Cheese math, number theory	1300	x11111
364C	Beautiful Set brute force, number theory	2300	x587
361B	Levko and Permutation constructive algorithms, math, number theory	1200	x7935
360D	Levko and Sets number theory	2600	x395
359C	Prime Number math, number theory	1900	x2959
354C	Vasya and Beautiful Arrays brute force, dp, number theory	2100	x3013
353C	Find Maximum implementation, math, number theory	1600	x4771
348B	Apple Tree dfs and similar, number theory, trees	2100	x2058
346E	Doodle Jump math, number theory	3000	x257
346A	Alice and Bob games, math, number theory	1600	x8516
343A	Rational Resistance math, number theory	1600	x8590
338D	GCD Table chinese remainder theorem, math, number theory	2900	x1101
337E	Divisor Tree brute force, number theory, trees	2200	x1010
337C	Quiz binary search, greedy, math, matrices, number theory	1600	x4825
337B	Routine Problem greedy, math, number theory	1400	x9187
336D	Vasily the Bear and Beautiful Strings combinatorics, math, number theory	2100	x938
336C	Vasily the Bear and Sequence brute force, greedy, implementation, number theory	1800	x2430
313A	Ilya and Bank Account implementation, number theory	900	x54536
306C	White, Black and White Again combinatorics, number theory	2100	x464
303D	Rotatable Number math, number theory	2600	x291
303C	Minimum Modular brute force, graphs, math, number theory	2400	x865
300E	Empire Strikes Back binary search, math, number theory	2300	x1028
299A	Ksusha and Array brute force, number theory, sortings	1000	x7826
294D	Shaass and Painter Robot brute force, implementation, number theory	2500	x308
294C	Shaass and Lights combinatorics, number theory	1900	x3738
293C	Cube Problem brute force, math, number theory	2400	x561
284A	Cows and Primitive Roots implementation, math, number theory	1400	x6453
283D	Cows and Cool Sequences dp, math, number theory	2400	x528
279E	Beautiful Decomposition dp, games, greedy, number theory	1900	x1418
271E	Three Horses constructive algorithms, math, number theory	2200	x480
271B	Prime Matrix binary search, brute force, math, number theory	1300	x12627
267A	Subtractions math, number theory	900	x7268
264B	Good Sequences dp, number theory	1500	x9837
251C	Number Transformation dp, greedy, number theory	2000	x1013
248B	Chilly Willy math, number theory	1400	x5226
237C	Primes on Interval binary search, number theory, two pointers	1600	x5618
236B	Easy Number Challenge implementation, number theory	1300	x13693
235E	Number Challenge combinatorics, dp, implementation, math, number theory	2600	x761
235A	LCM Challenge number theory	1600	x17181
230B	T-primes binary search, implementation, math, number theory	1300	x71873
226C	Anniversary data structures, implementation, math, matrices, number theory	2400	x850
225E	Unsolvable math, number theory	2100	x785
225B	Well-known Numbers binary search, greedy, number theory	1600	x3119
223C	Partial Sums combinatorics, math, number theory	1900	x1516
222C	Reducing Fractions implementation, math, number theory, sortings	1800	x2119
216E	Martian Luck math, number theory	2000	x556
215E	Periodical Numbers combinatorics, dp, number theory	2100	x543
200E	Tractor College implementation, math, number theory, ternary search	2400	x338
199A	Hexadecimal's theorem brute force, constructive algorithms, implementation, number theory	900	x25605
185D	Visit of the Great math, number theory	2600	x389
180B	Divisibility Rules math, number theory	2300	x329
177B2	Rectangular Game number theory	1200	x2854
177B1	Rectangular Game number theory	1000	x4027
172D	Calendar Reform *special problem, number theory	1500	x1385
172B	Pseudorandom Sequence Period *special problem, implementation, number theory	1200	x2697
171F	ucyhf *special problem, brute force, implementation, number theory	1600	x1260
158D	Ice Sculptures *special problem, brute force, number theory	1300	x6197
154B	Colliders math, number theory	1600	x4378
150A	Win or Freeze games, math, number theory	1400	x7640
134B	Pairs of Numbers brute force, dfs and similar, math, number theory	1900	x1935
123A	Prime Permutation implementation, number theory, strings	1300	x3537
122A	Lucky Division brute force, number theory	1000	x118584
121C	Lucky Permutation brute force, combinatorics, number theory	1900	x1273
117B	Very Interesting Game brute force, number theory	1800	x1542
113C	Double Happiness brute force, math, number theory	2200	x1207
111B	Petya and Divisors binary search, data structures, number theory	1900	x3578
93E	Lostborn dp, math, number theory	2600	x440
84A	Toy Army math, number theory	900	x14712
83D	Numbers dp, math, number theory	2400	x835