Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Problems

#	Name
1279D	Santa's Bot combinatorics, math, probabilities	1700	x6333
1279C	Stack of Presents data structures, implementation	1400	x11700
1279B	Verse For Santa binary search, brute force, implementation	1300	x13661
1278C	Berry Jam data structures, dp, greedy, implementation	1700	x8047
1278B	A and B greedy, math	1500	x13303
1277D	Let's Play the Words? data structures, hashing, implementation, math	1900	x3123
1276B	Two Fairs combinatorics, dfs and similar, dsu, graphs	1900	x4966
1276A	As Simple as One and Two dp, greedy	1400	x12326
1272E	Nearest Opposite Parity dfs and similar, graphs, shortest paths	1900	x6316
1272D	Remove One Element brute force, dp	1500	x16590
1271C	Shawarma Tent brute force, geometry, greedy, implementation	1300	x10568
1271B	Blocks greedy, math	1300	x11347
1270D	Strange Device constructive algorithms, interactive, math, sortings	1900	x4682
1270C	Make Good bitmasks, constructive algorithms, math	1400	x14102
1269B	Modulo Equality brute force, sortings	1500	x9164
1268A	Long Beautiful Integer constructive algorithms, greedy, implementation, strings	1700	x8634
1267L	Lexicography constructive algorithms, strings	1800	x3052
1267J	Just Arrange the Icons greedy, implementation, math	1800	x2813
1267E	Elections greedy	1700	x3236
1266C	Diverse Matrix constructive algorithms, greedy, math, number theory	1400	x9699
1265B	Beautiful Numbers data structures, implementation, math, two pointers	1300	x12587
1264B	Beautiful Sequence brute force, constructive algorithms, greedy	1900	x5805
1264A	Beautiful Regional Contest greedy, implementation	1500	x10069
1263D	Secret Passwords dfs and similar, dsu, graphs	1500	x14027
1263C	Everyone is a Winner! binary search, math, meet-in-the-middle, number theory	1400	x13724
1263B	PIN Codes greedy, implementation	1400	x11378
1260D	A Game with Traps binary search, dp, greedy, sortings	1900	x3852
1260C	Infinite Fence greedy, math, number theory	1700	x8243
1260B	Obtain Two Zeroes binary search, math	1300	x15749
1257D	Yet Another Monster Killing Problem binary search, data structures, dp, greedy, sortings, two pointers	1700	x7553
1256D	Binary String Minimizing greedy	1500	x12068
1256C	Platforms Jumping greedy	1700	x6905
1256B	Minimize the Permutation greedy	1400	x13091
1255C	League of Leesins constructive algorithms, implementation	1600	x6707
1254B1	Send Boxes to Alice (Easy Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	1800	x4662
1254A	Feeding Chicken constructive algorithms, greedy, implementation	1700	x5182
1253D	Harmonious Graph constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings	1700	x9224
1253C	Sweets Eating dp, greedy, math, sortings	1500	x14258
1253B	Silly Mistake greedy, implementation	1400	x11192
1252H	Twin Buildings greedy, implementation	1800	x2630
1252C	Even Path data structures, implementation	1600	x3718
1251D	Salary Changing binary search, greedy, sortings	1900	x5951
1251C	Minimize The Integer greedy, two pointers	1600	x12422
1251B	Binary Palindromes greedy, strings	1400	x11015
1250L	Divide The Students binary search, greedy, math	1500	x4100
1250J	The Parade binary search, greedy	1800	x2941
1250H	Happy Birthday math	1500	x4053
1250B	The Feast and the Bus brute force, constructive algorithms, greedy, math	1800	x2610
1250A	Berstagram implementation	1400	x4080
1249E	By Elevator or Stairs? dp, shortest paths	1700	x9695
1249D2	Too Many Segments (hard version) data structures, greedy, sortings	1800	x5244
1249D1	Too Many Segments (easy version) greedy	1800	x5113
1249C2	Good Numbers (hard version) binary search, greedy, math, meet-in-the-middle	1500	x12628
1249C1	Good Numbers (easy version) brute force, greedy, implementation	1300	x15528
1249B2	Books Exchange (hard version) dfs and similar, dsu, math	1300	x16797
1245D	Shichikuji and Power Grid dsu, graphs, greedy, shortest paths, trees	1900	x7555
1245C	Constanze's Machine dp	1400	x17534
1244D	Paint the Tree brute force, constructive algorithms, dp, graphs, implementation, trees	1800	x7571
1243B2	Character Swap (Hard Version) strings	1600	x7092
1242B	0-1 MST dfs and similar, dsu, graphs, sortings	1900	x7519
1242A	Tile Painting constructive algorithms, math, number theory	1500	x12603
1239A	Ivan the Fool and the Probability Theory combinatorics, dp, math	1700	x7367
1238D	AB-string binary search, combinatorics, dp, strings	1900	x6001
1238C	Standard Free2play dp, greedy, math	1600	x7423
1238B	Kill `Em All greedy, sortings	1300	x13635
1237C2	Balanced Removals (Harder) binary search, constructive algorithms, divide and conquer, greedy, implementation, sortings	1900	x4334
1237C1	Balanced Removals (Easier) constructive algorithms, geometry, greedy	1700	x6086
1237B	Balanced Tunnel data structures, sortings, two pointers	1300	x16058
1236C	Labs constructive algorithms, greedy, implementation	1300	x10159
1236B	Alice and the List of Presents combinatorics, math	1500	x11064
1234D	Distinct Characters Queries data structures	1600	x15030
1234C	Pipes dp, implementation	1500	x12610
1234B2	Social Network (hard version) data structures, implementation	1300	x16906
1228D	Complete Tripartite brute force, constructive algorithms, graphs, hashing, implementation	1900	x5212
1228C	Primes and Multiplication math, number theory	1700	x9029
1228B	Filling the Grid implementation, math	1400	x11514
1227D2	Optimal Subsequences (Hard Version) data structures, greedy	1800	x4336
1227D1	Optimal Subsequences (Easy Version) data structures, greedy	1600	x6402
1227C	Messy constructive algorithms	1700	x5525
1225D	Power Products hashing, math, number theory	1800	x8005
1225C	p-binary bitmasks, brute force, math	1600	x8960
1225B2	TV Subscriptions (Hard Version) implementation, two pointers	1300	x10605
1223C	Save the Nature binary search, greedy	1600	x8330
1221D	Make The Fence Great Again dp	1800	x9101
1220D	Alex and Julian bitmasks, math, number theory	1900	x3898
1220C	Substring Game in the Lesson games, greedy, strings	1300	x10208
1220B	Multiplication Table math, number theory	1300	x11608
1219C	Periodic integer number implementation, strings	1700	x1786
1218F	Workout plan data structures, greedy	1500	x2957
1217C	The Number Of Good Substrings binary search, bitmasks, brute force	1700	x7450
1217B	Zmei Gorynich greedy, math	1600	x11213
1217A	Creating a Character binary search, math	1300	x15006
1216E1	Numerical Sequence (easy version) binary search, brute force, math	1900	x3445
1216D	Swords math	1300	x11142
1216C	White Sheet geometry, math	1700	x9218
1215D	Ticket Game games, greedy, math	1700	x6154
1215C	Swap Letters constructive algorithms, greedy	1500	x11198
1215B	The Number of Products combinatorics, dp, implementation	1400	x12985
1214D	Treasure Island dfs and similar, dp, flows, hashing	1900	x5181
1214A	Optimal Currency Exchange brute force, math	1400	x9094