Problemset - Codeforces

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Codeforces Round 945 (Div. 2)
2 days
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number theory

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Problems

#	Name
460B	Little Dima and Equation brute force, implementation, math, number theory	1500	x12096
456B	Fedya and Maths math, number theory	1200	x16039
451E	Devu and Flowers bitmasks, combinatorics, number theory	2300	x3247
449E	Jzzhu and Squares dp, math, number theory	2900	x282
449C	Jzzhu and Apples constructive algorithms, number theory	2500	x2196
448E	Divisors brute force, dfs and similar, implementation, number theory	2200	x1446
446C	DZY Loves Fibonacci Numbers data structures, math, number theory	2400	x3181
439C	Devu and Partitioning of the Array brute force, constructive algorithms, implementation, number theory	1700	x3797
438E	The Child and Binary Tree combinatorics, divide and conquer, fft, number theory	3100	x1793
414B	Mashmokh and ACM combinatorics, dp, number theory	1400	x20891
414A	Mashmokh and Numbers constructive algorithms, number theory	1500	x9644
402D	Upgrading Array dp, greedy, math, number theory	1800	x2517
401D	Roman and Numbers bitmasks, brute force, combinatorics, dp, number theory	2000	x3971
396B	On Sum of Fractions math, number theory		x1043
396A	On Number of Decompositions into Multipliers combinatorics, math, number theory		x1461
385C	Bear and Prime Numbers binary search, brute force, data structures, dp, implementation, math, number theory	1700	x9390
375A	Divisible by Seven math, number theory	1600	x4665
371B	Fox Dividing Cheese math, number theory	1300	x10920
364C	Beautiful Set brute force, number theory	2300	x582
361B	Levko and Permutation constructive algorithms, math, number theory	1200	x7888
360D	Levko and Sets number theory	2600	x386
359C	Prime Number math, number theory	1900	x2939
354C	Vasya and Beautiful Arrays brute force, dp, number theory	2100	x2982
353C	Find Maximum implementation, math, number theory	1600	x4740
348B	Apple Tree dfs and similar, number theory, trees	2100	x2046
346E	Doodle Jump math, number theory	3000	x251
346A	Alice and Bob games, math, number theory	1600	x8464
343A	Rational Resistance math, number theory	1600	x8526
338D	GCD Table chinese remainder theorem, math, number theory	2900	x1095
337E	Divisor Tree brute force, number theory, trees	2200	x1005
337C	Quiz binary search, greedy, math, matrices, number theory	1600	x4775
337B	Routine Problem greedy, math, number theory	1400	x9098
336D	Vasily the Bear and Beautiful Strings combinatorics, math, number theory	2100	x934
336C	Vasily the Bear and Sequence brute force, greedy, implementation, number theory	1800	x2371
313A	Ilya and Bank Account implementation, number theory	900	x53691
306C	White, Black and White Again combinatorics, number theory	2100	x441
303D	Rotatable Number math, number theory	2600	x278
303C	Minimum Modular brute force, graphs, math, number theory	2400	x854
300E	Empire Strikes Back binary search, math, number theory	2300	x1027
299A	Ksusha and Array brute force, number theory, sortings	1000	x7757
294D	Shaass and Painter Robot brute force, implementation, number theory	2500	x299
294C	Shaass and Lights combinatorics, number theory	1900	x3719
293C	Cube Problem brute force, math, number theory	2400	x553
284A	Cows and Primitive Roots implementation, math, number theory	1400	x6371
283D	Cows and Cool Sequences dp, math, number theory	2400	x523
279E	Beautiful Decomposition dp, games, greedy, number theory	1900	x1410
271E	Three Horses constructive algorithms, math, number theory	2200	x478
271B	Prime Matrix binary search, brute force, math, number theory	1300	x12410
267A	Subtractions math, number theory	900	x7146
264B	Good Sequences dp, number theory	1500	x9625
251C	Number Transformation dp, greedy, number theory	2000	x1012
248B	Chilly Willy math, number theory	1400	x5196
237C	Primes on Interval binary search, number theory, two pointers	1600	x5576
236B	Easy Number Challenge implementation, number theory	1300	x13495
235E	Number Challenge combinatorics, dp, implementation, math, number theory	2600	x746
235A	LCM Challenge number theory	1600	x16843
230B	T-primes binary search, implementation, math, number theory	1300	x70115
226C	Anniversary data structures, implementation, math, matrices, number theory	2400	x844
225E	Unsolvable math, number theory	2100	x779
225B	Well-known Numbers binary search, greedy, number theory	1600	x3105
223C	Partial Sums combinatorics, math, number theory	1900	x1512
222C	Reducing Fractions implementation, math, number theory, sortings	1800	x2085
216E	Martian Luck math, number theory	2000	x543
215E	Periodical Numbers combinatorics, dp, number theory	2100	x538
200E	Tractor College implementation, math, number theory, ternary search	2400	x333
199A	Hexadecimal's theorem brute force, constructive algorithms, implementation, number theory	900	x25156
185D	Visit of the Great math, number theory	2600	x382
180B	Divisibility Rules math, number theory	2300	x327
177B2	Rectangular Game number theory	1200	x2828
177B1	Rectangular Game number theory	1000	x3992
172D	Calendar Reform *special problem, number theory	1500	x1382
172B	Pseudorandom Sequence Period *special problem, implementation, number theory	1200	x2689
171F	ucyhf *special problem, brute force, implementation, number theory	1600	x1247
158D	Ice Sculptures *special problem, brute force, number theory	1300	x6171
154B	Colliders math, number theory	1600	x4242
150A	Win or Freeze games, math, number theory	1400	x7586
134B	Pairs of Numbers brute force, dfs and similar, math, number theory	1900	x1918
123A	Prime Permutation implementation, number theory, strings	1300	x3517
122A	Lucky Division brute force, number theory	1000	x116417
121C	Lucky Permutation brute force, combinatorics, number theory	1900	x1267
117B	Very Interesting Game brute force, number theory	1800	x1538
113C	Double Happiness brute force, math, number theory	2200	x1202
111B	Petya and Divisors binary search, data structures, number theory	1900	x3544
93E	Lostborn dp, math, number theory	2600	x434
84A	Toy Army math, number theory	900	x14588
83D	Numbers dp, math, number theory	2400	x822
78C	Beaver Game dp, games, number theory	2000	x1804
75C	Modified GCD binary search, number theory	1600	x12017
74C	Chessboard Billiard dfs and similar, dsu, graphs, number theory	2100	x949
73E	Morrowindows math, number theory	2400	x322
71C	Round Table Knights dp, math, number theory	1600	x6236
68A	Irrational problem implementation, number theory	1100	x4817
66D	Petya and His Friends constructive algorithms, math, number theory	1700	x3054
64E	Prime Segment *special problem, brute force, math, number theory	1800	x234
59B	Fortune Telling implementation, number theory	1200	x6666
55D	Beautiful numbers dp, number theory	2500	x3611
45G	Prime Problem number theory	2200	x994
27E	Number With The Given Amount Of Divisors brute force, dp, number theory	2000	x3997
26A	Almost Prime number theory	900	x28680
17D	Notepad number theory	2400	x1038