Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Problems

#	Name
691D	Swaps in Permutation dfs and similar, dsu, math	1700	x5512
691C	Exponential notation implementation, strings	1800	x2604
691B	s-palindrome implementation, strings	1600	x4811
691A	Fashion in Berland implementation	1000	x10156
690F3	Tree of Life (hard) trees	3200	x47
690F2	Tree of Life (medium) constructive algorithms, hashing, trees	2700	x83
690F1	Tree of Life (easy)	1300	x2158
690E2	Photographs (II)	2600	x142
690E1	Photographs (I)	1800	x676
690D3	The Wall (hard) dp	2100	x511
690D2	The Wall (medium) combinatorics	1800	x1246
690D1	The Wall (easy)	1200	x2613
690C3	Brain Network (hard) trees	2200	x904
690C2	Brain Network (medium) dfs and similar, graphs, trees	1500	x3719
690C1	Brain Network (easy)	1300	x2755
690B3	Recover Polygon (hard) data structures	2600	x92
690B2	Recover Polygon (medium) geometry	2600	x204
690B1	Recover Polygon (easy)	1700	x940
690A3	Collective Mindsets (hard)	2400	x545
690A2	Collective Mindsets (medium)	2300	x708
690A1	Collective Mindsets (easy)	1100	x2821
689E	Mike and Geometry Problem combinatorics, data structures, dp, geometry, implementation	2000	x1923
689D	Friends and Subsequences binary search, data structures	2100	x3420
689C	Mike and Chocolate Thieves binary search, combinatorics, math	1700	x5326
689B	Mike and Shortcuts dfs and similar, graphs, greedy, shortest paths	1600	x5716
689A	Mike and Cellphone brute force, constructive algorithms, implementation	1400	x5257
688B	Lovely Palindromes constructive algorithms, math	1000	x32040
688A	Opponents implementation	800	x13937
687E	TOF dfs and similar, graphs	2900	x318
687D	Dividing Kingdom II brute force, data structures, dsu, graphs, sortings	2500	x954
687C	The Values You Can Make dp	1900	x5500
687B	Remainders Game chinese remainder theorem, math, number theory	1800	x5871
687A	NP-Hard Problem dfs and similar, graphs	1500	x14338
686B	Little Robber Girl's Zoo constructive algorithms, implementation, sortings	1100	x7783
686A	Free Ice Cream constructive algorithms, implementation	800	x37493
685E	Travelling Through the Snow Queen's Kingdom bitmasks, brute force, divide and conquer, graphs	2800	x553
685D	Kay and Eternity brute force, implementation, sortings	2600	x480
685C	Optimal Point binary search, math	2900	x583
685B	Kay and Snowflake data structures, dfs and similar, dp, trees	1900	x4074
685A	Robbers' watch brute force, combinatorics, dp, math	1700	x4229
683J	The Hero with Bombs *special problem	3000	x40
683I	Loader *special problem, graphs	2500	x38
683H	Exchange of Books *special problem	1900	x95
683G	The Fraction *special problem	1900	x130
683F	Reformat the String *special problem	1800	x146
683E	Hammer throwing *special problem	1800	x188
683D	Chocolate Bar *special problem, math	1400	x322
683C	Symmetric Difference *special problem	1600	x315
683B	The Teacher of Physical Education *special problem	1600	x317
683A	The Check of the Point *special problem, geometry	1200	x787
682E	Alyona and Triangles geometry, two pointers	2600	x664
682D	Alyona and Strings dp, strings	1900	x3294
682C	Alyona and the Tree dfs and similar, dp, graphs, trees	1600	x7227
682B	Alyona and Mex sortings	1200	x11406
682A	Alyona and Numbers constructive algorithms, math, number theory	1100	x21655
681E	Runaway to a Shadow geometry, sortings	2500	x462
681D	Gifts by the List constructive algorithms, dfs and similar, graphs, trees	2000	x1768
681C	Heap Operations constructive algorithms, data structures, greedy	1600	x7724
681B	Economy Game brute force	1300	x8933
681A	A Good Contest implementation	800	x15402
680B	Bear and Finding Criminals constructive algorithms, implementation	1000	x24315
680A	Bear and Five Cards constructive algorithms, implementation	800	x12314
679E	Bear and Bad Powers of 42 data structures	3100	x684
679D	Bear and Chase brute force, dfs and similar, graphs, implementation, math, probabilities	2900	x315
679C	Bear and Square Grid dfs and similar, dsu, implementation	2400	x1155
679B	Bear and Tower of Cubes binary search, dp, greedy	2200	x2142
679A	Bear and Prime 100 constructive algorithms, interactive, math	1400	x12979
678F	Lena and Queries data structures, divide and conquer, geometry	2500	x875
678E	Another Sith Tournament bitmasks, dp, math, probabilities	2200	x2199
678D	Iterated Linear Function math, number theory	1700	x4507
678C	Joty and Chocolate implementation, math, number theory	1600	x9406
678B	The Same Calendar implementation	1600	x4110
678A	Johny Likes Numbers implementation, math	800	x13278
677E	Vanya and Balloons binary search, brute force, dp, implementation	2300	x603
677D	Vanya and Treasure data structures, dp, graphs, shortest paths	2300	x1582
677C	Vanya and Label bitmasks, combinatorics, implementation, strings	1500	x6408
677B	Vanya and Food Processor implementation, math	1400	x7640
677A	Vanya and Fence implementation	800	x140385
676E	The Last Fight Between Human and AI math	2400	x891
676D	Theseus and labyrinth graphs, implementation, shortest paths	2000	x1861
676C	Vasya and String binary search, dp, strings, two pointers	1500	x18831
676B	Pyramid of Glasses implementation, math, math	1500	x5496
676A	Nicholas and Permutation constructive algorithms, implementation	800	x13819
675E	Trains and Statistic data structures, dp, greedy	2300	x2752
675D	Tree Construction data structures, trees	1800	x3786
675C	Money Transfers constructive algorithms, data structures, greedy, sortings	2100	x3649
675B	Restoring Painting brute force, constructive algorithms, math	1400	x7383
675A	Infinite Sequence math	1100	x14933
673B	Problems for Round greedy, implementation	1300	x3522
673A	Bear and Game implementation	800	x10057
672B	Different is Good constructive algorithms, implementation, strings	1000	x17349
672A	Summer Camp implementation	800	x15314
671E	Organizing a Race data structures, greedy	3300	x411
671D	Roads in Yusland data structures, dp, greedy	2900	x1152
671C	Ultimate Weirdness of an Array data structures, number theory	2800	x685
671B	Robin Hood binary search, greedy	2000	x3023
671A	Recycling Bottles dp, geometry, greedy, implementation	1800	x4183
670F	Restore a Number brute force, constructive algorithms, strings	2300	x859
670E	Correct Bracket Sequence Editor data structures, dsu, strings	1700	x3218
670D2	Magic Powder - 2 binary search, implementation	1500	x14316