Problemset - Codeforces

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Educational Codeforces Round 81 (Rated for Div. 2)
2 days
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combinatorics

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Problems

#	Name
1293B	JOE is on TV! combinatorics, greedy, math	1000	x9442
1292F	Nora's Toy Boxes bitmasks, combinatorics, dp	3400	x24
1292C	Xenon's Attack on the Gangs combinatorics, dfs and similar, dp, greedy, trees	2300	x833
1288C	Two Arrays combinatorics, dp	1600	x4506
1285F	Classical? binary search, combinatorics, number theory	2800	x257
1284E	New Year and Castle Construction combinatorics, geometry, math, sortings	2500	x606
1284C	New Year and Permutation combinatorics, math	1700	x4546
1284B	New Year and Ascent Sequence binary search, combinatorics, data structures, dp, implementation, sortings	1500	x6236
1279E	New Year Permutations combinatorics, dp	2700	x152
1279D	Santa's Bot combinatorics, math, probabilities	1700	x2789
1278F	Cards combinatorics, dp, math, number theory, probabilities	2600	x390
1271E	Common Number binary search, combinatorics, dp, math	2100	x1489
1280F	Intergalactic Sliding Puzzle combinatorics, constructive algorithms, math	3400	x26
1276C	Beautiful Rectangle brute force, combinatorics, constructive algorithms, data structures, greedy, math	2300	x783
1276B	Two Fairs combinatorics, dfs and similar, dsu, graphs	1900	x2298
1272C	Yet Another Broken Keyboard combinatorics, dp, implementation	1100	x8018
1264D2	Beautiful Bracket Sequence (hard version) combinatorics, probabilities	3000	x166
1264D1	Beautiful Bracket Sequence (easy version) combinatorics, dp, probabilities	2600	x445
1267K	Key Storage combinatorics, math	2200	x850
1227F2	Wrong Answer on test 233 (Hard Version) combinatorics, math	2400	x699
1254E	Send Tree to Charlie combinatorics, dfs and similar, dsu, trees	3200	x81
1245F	Daniel and Spring Cleaning bitmasks, brute force, combinatorics, dp	2300	x944
1251F	Red-White Fence combinatorics, fft	2600	x263
1239A	Ivan the Fool and the Probability Theory combinatorics, dp, math	1700	x4167
1236B	Alice and the List of Presents combinatorics, math	1400	x6140
1237F	Balanced Domino Placements combinatorics, dp	2600	x364
1238D	AB-string binary search, combinatorics, dp, strings	1800	x3174
1228E	Another Filling the Grid combinatorics, dp, math	2300	x1236
1221G	Graph And Numbers bitmasks, brute force, combinatorics, dp, meet-in-the-middle	2900	x193
1215B	The Number of Products combinatorics, dp, implementation	1500	x5791
1207D	Number Of Permutations combinatorics	1800	x3422
1204E	Natasha, Sasha and the Prefix Sums combinatorics, dp, math, number theory	2400	x797
1205E	Expected Value Again combinatorics, strings	3100	x88
1202D	Print a 1337-string... combinatorics, constructive algorithms, math, strings	1900	x2739
1197E	Culture Code binary search, combinatorics, data structures, dp, shortest paths, sortings	2300	x845
1178F1	Short Colorful Strip combinatorics, dfs and similar, dp	2200	x1052
1195D2	Submarine in the Rybinsk Sea (hard edition) combinatorics, math, number theory	1700	x3017
1195D1	Submarine in the Rybinsk Sea (easy edition) combinatorics, math, number theory	1500	x5265
1178C	Tiles combinatorics, greedy, math	1300	x6209
1194F	Crossword Expert combinatorics, dp, number theory, probabilities, two pointers	2500	x444
1188E	Problem from Red Panda combinatorics	3200	x59
1185G2	Playlist for Polycarp (hard version) combinatorics, dp	2800	x348
1185G1	Playlist for Polycarp (easy version) bitmasks, combinatorics, dp	2100	x1424
1181C	Flag brute force, combinatorics, dp, implementation	1900	x2083
1172B	Nauuo and Circle combinatorics, dfs and similar, dp, trees	2000	x2254
1174E	Ehab and the Expected GCD Problem combinatorics, dp, math, number theory	2500	x652
1166A	Silent Classroom combinatorics, greedy	900	x9267
1167F	Scalar Queries combinatorics, data structures, math, sortings	2300	x774
1167E	Range Deleting binary search, combinatorics, data structures, two pointers	2100	x1334
1151F	Sonya and Informatics combinatorics, dp, matrices, probabilities	2500	x540
1151E	Number of Components combinatorics, data structures, dp, math	2100	x1608
1153F	Serval and Bonus Problem combinatorics, dp, math, probabilities	2800	x346
1140E	Palindrome-less Arrays combinatorics, divide and conquer, dp	2200	x1191
1118F2	Tree Cutting (Hard Version) combinatorics, dfs and similar, dp, trees	2700	x212
1109D	Sasha and Interesting Fact from Graph Theory brute force, combinatorics, dp, math, trees	2600	x708
1111D	Destroy the Colony combinatorics, dp, math	2500	x533
1105C	Ayoub and Lost Array combinatorics, dp, math	1500	x5549
1102E	Monotonic Renumeration combinatorics, sortings	1800	x2868
1097G	Vladislav and a Great Legend combinatorics, dp, trees	2900	x214
1097F	Alex and a TV Show bitmasks, combinatorics, number theory	2400	x686
1091D	New Year and the Permutation Concatenation combinatorics, dp, math	1700	x4350
1096E	The Top Scorer combinatorics, dp, math, probabilities	2600	x323
1096B	Substring Removal combinatorics, math, strings	1400	x6273
1085G	Beautiful Matrix combinatorics, data structures, dp	2600	x208
1081C	Colorful Bricks combinatorics, dp, math	1600	x3696
1084C	The Fair Nut and String combinatorics, dp, implementation	1500	x4276
1043F	Make It One bitmasks, combinatorics, dp, math, number theory, shortest paths	2500	x927
1043D	Mysterious Crime brute force, combinatorics, math, meet-in-the-middle, two pointers	1700	x3028
1073E	Segment Sum bitmasks, combinatorics, dp, math	2300	x1077
1065E	Side Transmutations combinatorics, strings	2200	x591
1060F	Shrinking Tree combinatorics, dp	2800	x194
1034C	Region Separation combinatorics, dp, number theory, trees	2900	x335
1036F	Relatively Prime Powers combinatorics, math, number theory	2400	x734
1036C	Classy Numbers combinatorics, dp	1800	x3336
1037F	Maximum Reduction combinatorics, data structures, math	2400	x625
1028D	Order book combinatorics, data structures, greedy	2100	x1288
1027E	Inverse Coloring combinatorics, dp, math	2100	x1028
1009E	Intercity Travelling combinatorics, math, probabilities	1900	x1785
1007B	Pave the Parallelepiped bitmasks, brute force, combinatorics, math, number theory	2400	x654
1007A	Reorder the Array combinatorics, data structures, math, sortings, two pointers	1300	x7237
997D	Cycles in product combinatorics, divide and conquer, trees	2800	x202
997C	Sky Full of Stars combinatorics, math	2600	x694
997B	Roman Digits brute force, combinatorics, dp, greedy, math	2000	x2104
1000D	Yet Another Problem On a Subsequence combinatorics, dp	1900	x2057
995F	Cowmpany Cowmpensation combinatorics, dp, math, trees	2700	x373
991E	Bus Number brute force, combinatorics, math	1800	x2082
986B	Petr and Permutations combinatorics, math	1800	x3025
981H	K Paths combinatorics, data structures, dp, fft, math	2900	x124
985G	Team Players combinatorics	2700	x169
978E	Bus Video System combinatorics, math	1400	x4625
960G	Bandit Blues combinatorics, dp, fft, math	2800	x396
960E	Alternating Tree combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees	2200	x793
961G	Partitions combinatorics, math, number theory	2700	x379
954H	Path Counting combinatorics, dp	2500	x225
946F	Fibonacci String Subsequences combinatorics, dp, matrices	2500	x272
929C	Красивая команда *special problem, combinatorics, math	2000	x1026
938E	Max History combinatorics, math	2300	x648
932E	Team Work combinatorics, dp, math	2400	x1122
933D	A Creative Cutout brute force, combinatorics, math	2900	x133
920G	List Of Integers binary search, bitmasks, brute force, combinatorics, math, number theory	2300	x901

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