Problemset - Codeforces

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Educational Codeforces Round 167 (Rated for Div. 2)
33:27:05
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combinatorics

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Problems

#	Name
690D2	The Wall (medium) combinatorics	1800	x1217
689E	Mike and Geometry Problem combinatorics, data structures, dp, geometry, implementation	2000	x1827
689C	Mike and Chocolate Thieves binary search, combinatorics, math	1700	x5017
685A	Robbers' watch brute force, combinatorics, dp, math	1700	x4157
677C	Vanya and Label bitmasks, combinatorics, implementation, strings	1500	x6318
666C	Codeword combinatorics, strings	2500	x771
660E	Different Subsets For All Tuples combinatorics, math	2300	x1254
659G	Fence Divercity combinatorics, dp, number theory	2300	x988
653G	Move by Prime combinatorics, math, number theory	3100	x524
652C	Foe Pairs combinatorics, sortings, two pointers	1800	x3132
645F	Cowslip Collections combinatorics, math, number theory	2500	x766
630I	Parking Lot combinatorics, math	1700	x6435
630H	Benches combinatorics, math	1400	x4812
630G	Challenge Pennants combinatorics, math	1600	x2689
630F	Selection of Personnel combinatorics, math	1300	x6681
630C	Lucky Numbers combinatorics, math	1100	x21110
629E	Famil Door and Roads combinatorics, data structures, dfs and similar, dp, probabilities, trees	2300	x975
629A	Far Relative’s Birthday Cake brute force, combinatorics, constructive algorithms, implementation	800	x13199
626D	Jerry's Protest brute force, combinatorics, dp, probabilities	1800	x2674
623E	Transforming Sequence combinatorics, dp, fft, math	3300	x536
621C	Wet Shark and Flowers combinatorics, math, number theory, probabilities	1700	x5342
621B	Wet Shark and Bishops combinatorics, implementation	1300	x10851
617B	Chocolate combinatorics	1300	x17496
612E	Square Root of Permutation combinatorics, constructive algorithms, dfs and similar, graphs, math	2200	x1593
610A	Pasha and Stick combinatorics, math	1000	x22405
608B	Hamming Distance Sum combinatorics, strings	1500	x6677
603B	Moodular Arithmetic combinatorics, dfs and similar, dsu, math, number theory	1800	x2547
596C	Wilbur and Points combinatorics, greedy, sortings	1700	x2240
585E	Present for Vitalik the Philatelist combinatorics, math, number theory	2900	x1049
584B	Kolya and Tanya combinatorics	1500	x11728
577B	Modulo Sum combinatorics, data structures, dp, two pointers	1900	x11702
575H	Bots combinatorics, dp, math, number theory	1800	x1638
571A	Lengthening Sticks combinatorics, implementation, math	2100	x2069
570E	Pig and Palindromes combinatorics, dp	2300	x1814
568B	Symmetric and Transitive combinatorics, dp, math	1900	x2222
559D	Randomizer combinatorics, geometry, probabilities	2800	x424
559C	Gerald and Giant Chess combinatorics, dp, math, number theory	2200	x6233
557D	Vitaly and Cycle combinatorics, dfs and similar, graphs, math	2000	x2149
553B	Kyoya and Permutation binary search, combinatorics, constructive algorithms, greedy, implementation, math	1900	x2100
553A	Kyoya and Colored Balls combinatorics, dp, math	1500	x8427
552D	Vanya and Triangles brute force, combinatorics, data structures, geometry, math, sortings	1900	x4382
551D	GukiZ and Binary Operations combinatorics, implementation, math, matrices, number theory	2100	x1817
547C	Mike and Foam bitmasks, combinatorics, dp, math, number theory	2300	x2735
535B	Tavas and SaDDas bitmasks, brute force, combinatorics, implementation	1100	x21922
520E	Pluses everywhere combinatorics, dp, math, number theory	2200	x1816
518F	Pasha and Pipe binary search, brute force, combinatorics, dp, implementation	2300	x358
518D	Ilya and Escalator combinatorics, dp, math, probabilities	1700	x6789
506E	Mr. Kitayuta's Gift combinatorics, dp, matrices, strings	3000	x701
501E	Misha and Palindrome Degree binary search, combinatorics, implementation	2500	x720
500D	New Year Santa Network combinatorics, dfs and similar, graphs, trees	1900	x3074
489F	Special Matrices combinatorics, dp	2100	x1606
489D	Unbearable Controversy of Being brute force, combinatorics, dfs and similar, graphs	1700	x6570
482D	Random Function and Tree combinatorics, dp, trees	2700	x524
479E	Riding in a Lift combinatorics, dp	1900	x4981
478B	Random Teams combinatorics, constructive algorithms, greedy, math	1300	x35689
476B	Dreamoon and WiFi bitmasks, brute force, combinatorics, dp, math, probabilities	1300	x29548
466D	Increase Sequence combinatorics, dp	2100	x2927
459C	Pashmak and Buses combinatorics, constructive algorithms, math	1900	x6097
459B	Pashmak and Flowers combinatorics, implementation, sortings	1300	x39055
457D	Bingo! combinatorics, math, probabilities	2700	x273
452C	Magic Trick combinatorics, math, probabilities	2100	x1452
451E	Devu and Flowers bitmasks, combinatorics, number theory	2300	x3363
449D	Jzzhu and Numbers bitmasks, combinatorics, dp	2400	x4158
439E	Devu and Birthday Celebration combinatorics, dp, math	2100	x1501
438E	The Child and Binary Tree combinatorics, divide and conquer, fft, number theory	3100	x1808
431D	Random Task binary search, bitmasks, combinatorics, dp, math	2100	x2152
414C	Mashmokh and Reverse Operation combinatorics, divide and conquer	2100	x2184
414B	Mashmokh and ACM combinatorics, dp, number theory	1400	x21271
407C	Curious Array brute force, combinatorics, implementation, math	2500	x960
403D	Beautiful Pairs of Numbers combinatorics, dp	2300	x1076
401D	Roman and Numbers bitmasks, brute force, combinatorics, dp, number theory	2000	x4011
396D	On Sum of Number of Inversions in Permutations combinatorics, math		x412
396A	On Number of Decompositions into Multipliers combinatorics, math, number theory		x1464
392C	Yet Another Number Sequence combinatorics, math, matrices		x583
383E	Vowels combinatorics, divide and conquer, dp	2700	x2819
382E	Ksenia and Combinatorics combinatorics, dp	2600	x369
380D	Sereja and Cinema combinatorics, math	2500	x413
374B	Inna and Nine combinatorics, greedy	1500	x3239
372E	Drawing Circles is Fun combinatorics, geometry	3000	x170
367E	Sereja and Intervals combinatorics, dp	2700	x1077
364A	Matrix combinatorics, data structures, implementation	1600	x4627
360C	Levko and Strings combinatorics, dp	2500	x1071
356C	Compartments combinatorics, constructive algorithms, greedy, implementation	2100	x1237
353B	Two Heaps combinatorics, constructive algorithms, greedy, implementation, math, sortings	1900	x2203
351B	Jeff and Furik combinatorics, dp, probabilities	1900	x2301
340E	Iahub and Permutations combinatorics, math	2000	x2313
340C	Tourist Problem combinatorics, implementation, math	1600	x4139
336E	Vasily the Bear and Painting Square bitmasks, combinatorics, dp, implementation	2700	x112
336D	Vasily the Bear and Beautiful Strings combinatorics, math, number theory	2100	x936
327E	Axis Walking bitmasks, combinatorics, constructive algorithms, dp, meet-in-the-middle	2300	x1360
327C	Magic Five combinatorics, math	1700	x3151
325E	The Red Button combinatorics, dfs and similar, dsu, graphs, greedy	2800	x758
323A	Black-and-White Cube combinatorics, constructive algorithms	1600	x725
322B	Ciel and Flowers combinatorics, math	1600	x11575
319A	Malek Dance Club combinatorics, math	1600	x2769
306C	White, Black and White Again combinatorics, number theory	2100	x463
305D	Olya and Graph combinatorics, math	2200	x456
300C	Beautiful Numbers brute force, combinatorics	1800	x9035
296B	Yaroslav and Two Strings combinatorics, dp	2000	x2127
295D	Greg and Caves combinatorics, dp	2400	x640