Problemset - Codeforces

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Before contest
Codeforces Round 941 (Div. 1)
4 days

Before contest
Codeforces Round 941 (Div. 2)
4 days

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Difficulty: —

combinatorics

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Problems

#	Name
459B	Pashmak and Flowers combinatorics, implementation, sortings	1300	x38333
478B	Random Teams combinatorics, constructive algorithms, greedy, math	1300	x35142
1843C	Sum in Binary Tree bitmasks, combinatorics, math, trees	800	x30912
476B	Dreamoon and WiFi bitmasks, brute force, combinatorics, dp, math, probabilities	1300	x28920
1328B	K-th Beautiful String binary search, brute force, combinatorics, implementation, math	1300	x28021
1743A	Password brute force, combinatorics, implementation, math	800	x25994
1674B	Dictionary combinatorics, math	800	x25546
1272C	Yet Another Broken Keyboard combinatorics, dp, implementation	1200	x24991
1840C	Ski Resort combinatorics, math, two pointers	1000	x24358
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x23513
1674C	Infinite Replacement combinatorics, implementation, strings	1000	x22833
1543B	Customising the Track combinatorics, greedy, math	900	x22624
1514B	AND 0, Sum Big bitmasks, combinatorics, math	1200	x22550
1771A	Hossam and Combinatorics combinatorics, math, sortings	900	x21962
610A	Pasha and Stick combinatorics, math	1000	x21941
535B	Tavas and SaDDas bitmasks, brute force, combinatorics, implementation	1100	x21536
1840B	Binary Cafe bitmasks, combinatorics, math	1100	x21392
1499A	Domino on Windowsill combinatorics, constructive algorithms, math	800	x21000
1293B	JOE is on TV! combinatorics, greedy, math	1000	x20756
414B	Mashmokh and ACM combinatorics, dp, number theory	1400	x20694
630C	Lucky Numbers combinatorics, math	1100	x20331
1475C	Ball in Berland combinatorics, graphs, math	1400	x19886
1539A	Contest Start combinatorics, geometry, greedy, math	1000	x19559
1821A	Matching combinatorics, math	800	x19310
1917B	Erase First or Second Letter brute force, combinatorics, data structures, dp, strings	1100	x19156
1922B	Forming Triangles combinatorics, constructive algorithms, math, sortings	1200	x18803
1582B	Luntik and Subsequences combinatorics, math	900	x18684
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18337
1433E	Two Round Dances combinatorics, math	1300	x17986
1827A	Counting Orders combinatorics, math, sortings, two pointers	1100	x17353
617B	Chocolate combinatorics	1300	x17262
1574B	Combinatorics Homework combinatorics, greedy, math	1100	x16984
1843D	Apple Tree combinatorics, dfs and similar, dp, math, trees	1200	x16936
1777B	Emordnilap combinatorics, greedy, math	900	x16543
251A	Points on Line binary search, combinatorics, two pointers	1300	x16529
1862D	Ice Cream Balls binary search, combinatorics, constructive algorithms, math	1300	x15909
1823A	A-characteristic combinatorics, constructive algorithms, math	800	x15769
1931D	Divisible Pairs combinatorics, math, number theory	1300	x15547
1326C	Permutation Partitions combinatorics, greedy, math	1300	x15204
1552B	Running for Gold combinatorics, graphs, greedy, sortings	1500	x14934
1879C	Make it Alternating combinatorics, dp, greedy	1300	x14759
1391C	Cyclic Permutations combinatorics, dp, graphs, math	1500	x14526
1732A	Bestie brute force, combinatorics, constructive algorithms, implementation, math, number theory	1000	x14369
1166A	Silent Classroom combinatorics, greedy	900	x13806
1513B	AND Sequences bitmasks, combinatorics, constructive algorithms, math	1400	x13669
1305C	Kuroni and Impossible Calculation brute force, combinatorics, math, number theory	1600	x13491
1581A	CQXYM Count Permutations combinatorics, math, number theory	800	x13228
1462E1	Close Tuples (easy version) binary search, combinatorics, math, sortings, two pointers	1500	x13154
629A	Far Relative’s Birthday Cake brute force, combinatorics, constructive algorithms, implementation	800	x13087
1475E	Advertising Agency combinatorics, math, sortings	1600	x12826
1534C	Little Alawn's Puzzle combinatorics, dp, dsu, graphs, math	1300	x12468
1288C	Two Arrays combinatorics, dp	1600	x12252
1215B	The Number of Products combinatorics, dp, implementation	1400	x12028
1007A	Reorder the Array combinatorics, data structures, math, sortings, two pointers	1300	x11971
1567C	Carrying Conundrum bitmasks, combinatorics, dp, math	1600	x11809
1648A	Weird Sum combinatorics, data structures, geometry, math, matrices, sortings	1400	x11674
1569C	Jury Meeting combinatorics, math	1500	x11621
584B	Kolya and Tanya combinatorics	1500	x11562
322B	Ciel and Flowers combinatorics, math	1600	x11466
577B	Modulo Sum combinatorics, data structures, dp, two pointers	1900	x11420
1178C	Tiles combinatorics, greedy, math	1300	x11262
1850G	The Morning Star combinatorics, data structures, geometry, implementation, math, sortings	1500	x11120
1594E1	Rubik's Cube Coloring (easy version) combinatorics, math	1300	x10837
621B	Wet Shark and Bishops combinatorics, implementation	1300	x10770
1236B	Alice and the List of Presents combinatorics, math	1500	x10616
131C	The World is a Theatre combinatorics, math	1400	x10610
1284B	New Year and Ascent Sequence binary search, combinatorics, data structures, dp, implementation, sortings	1400	x10576
1436C	Binary Search binary search, combinatorics	1500	x10511
1096B	Substring Removal combinatorics, math, strings	1300	x10321
152C	Pocket Book combinatorics	1400	x10238
1105C	Ayoub and Lost Array combinatorics, dp, math	1500	x10108
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x9894
1400D	Zigzags brute force, combinatorics, data structures, math, two pointers	1900	x9769
804B	Minimum number of steps combinatorics, greedy, implementation, math	1400	x9511
1767D	Playoff combinatorics, constructive algorithms, dp, greedy, math	1500	x9369
1699C	The Third Problem combinatorics, constructive algorithms, math	1700	x9360
978E	Bus Video System combinatorics, math	1400	x9192
1462E2	Close Tuples (hard version) binary search, combinatorics, implementation, math, sortings, two pointers	1700	x9182
1301C	Ayoub's function binary search, combinatorics, greedy, math, strings	1700	x9013
1312D	Count the Arrays combinatorics, math	1700	x8888
300C	Beautiful Numbers brute force, combinatorics	1800	x8835
1762C	Binary Strings are Fun combinatorics, math	1400	x8815
1739C	Card Game combinatorics, constructive algorithms, dp, games	1500	x8671
1907E	Good Triples brute force, combinatorics, number theory	1600	x8655
1036C	Classy Numbers combinatorics, dp	1900	x8500
1327E	Count The Blocks combinatorics, dp, math	1800	x8484
1528B	Kavi on Pairing Duty combinatorics, dp, math	1700	x8438
1795D	Triangle Coloring combinatorics, math	1600	x8392
1598D	Training Session combinatorics, data structures, geometry, implementation, math	1700	x8374
553A	Kyoya and Colored Balls combinatorics, dp, math	1500	x8366
1715C	Monoblock combinatorics, data structures, implementation, math	1700	x8304
1557C	Moamen and XOR bitmasks, combinatorics, dp, math, matrices	1700	x8297
1422C	Bargain combinatorics, dp, math	1700	x8064
1789C	Serval and Toxel's Arrays combinatorics, dp, implementation, math	1500	x8011
1452D	Radio Towers combinatorics, dp, math	1600	x7740
1284C	New Year and Permutation combinatorics, math	1600	x7687
1195D1	Submarine in the Rybinsk Sea (easy edition) combinatorics, math, number theory	1500	x7659
888D	Almost Identity Permutations combinatorics, dp, math	1600	x7581
1084C	The Fair Nut and String combinatorics, dp, implementation	1500	x7498
1876B	Effects of Anti Pimples combinatorics, number theory, sortings	1500	x7423

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