Problemset - Codeforces

→ Pay attention

Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
28:06:32
Register now »

→ Filter Problems

Difficulty: —

combinatorics

Add tag

Problems

#	Name
459B	Pashmak and Flowers combinatorics, implementation, sortings	1300	x38386
478B	Random Teams combinatorics, constructive algorithms, greedy, math	1300	x35185
1843C	Sum in Binary Tree bitmasks, combinatorics, math, trees	800	x30967
476B	Dreamoon and WiFi bitmasks, brute force, combinatorics, dp, math, probabilities	1300	x28962
1328B	K-th Beautiful String binary search, brute force, combinatorics, implementation, math	1300	x28039
1743A	Password brute force, combinatorics, implementation, math	800	x26036
1674B	Dictionary combinatorics, math	800	x25569
1272C	Yet Another Broken Keyboard combinatorics, dp, implementation	1200	x25017
1840C	Ski Resort combinatorics, math, two pointers	1000	x24431
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x23599
1674C	Infinite Replacement combinatorics, implementation, strings	1000	x22874
1514B	AND 0, Sum Big bitmasks, combinatorics, math	1200	x22655
1543B	Customising the Track combinatorics, greedy, math	900	x22637
1771A	Hossam and Combinatorics combinatorics, math, sortings	900	x21990
610A	Pasha and Stick combinatorics, math	1000	x21971
535B	Tavas and SaDDas bitmasks, brute force, combinatorics, implementation	1100	x21562
1840B	Binary Cafe bitmasks, combinatorics, math	1100	x21417
1499A	Domino on Windowsill combinatorics, constructive algorithms, math	800	x21005
1293B	JOE is on TV! combinatorics, greedy, math	1000	x20770
414B	Mashmokh and ACM combinatorics, dp, number theory	1400	x20758
630C	Lucky Numbers combinatorics, math	1100	x20354
1475C	Ball in Berland combinatorics, graphs, math	1400	x19916
1539A	Contest Start combinatorics, geometry, greedy, math	1000	x19574
1821A	Matching combinatorics, math	800	x19322
1917B	Erase First or Second Letter brute force, combinatorics, data structures, dp, strings	1100	x19246
1922B	Forming Triangles combinatorics, constructive algorithms, math, sortings	1200	x18882
1582B	Luntik and Subsequences combinatorics, math	900	x18730
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18346
1433E	Two Round Dances combinatorics, math	1300	x17996
1827A	Counting Orders combinatorics, math, sortings, two pointers	1100	x17390
617B	Chocolate combinatorics	1300	x17291
1574B	Combinatorics Homework combinatorics, greedy, math	1100	x17004
1843D	Apple Tree combinatorics, dfs and similar, dp, math, trees	1200	x16965
1777B	Emordnilap combinatorics, greedy, math	900	x16557
251A	Points on Line binary search, combinatorics, two pointers	1300	x16551
1862D	Ice Cream Balls binary search, combinatorics, constructive algorithms, math	1300	x15938
1823A	A-characteristic combinatorics, constructive algorithms, math	800	x15779
1931D	Divisible Pairs combinatorics, math, number theory	1300	x15639
1326C	Permutation Partitions combinatorics, greedy, math	1300	x15211
1552B	Running for Gold combinatorics, graphs, greedy, sortings	1500	x14946
1879C	Make it Alternating combinatorics, dp, greedy	1300	x14811
1391C	Cyclic Permutations combinatorics, dp, graphs, math	1500	x14530
1732A	Bestie brute force, combinatorics, constructive algorithms, implementation, math, number theory	1000	x14388
1166A	Silent Classroom combinatorics, greedy	900	x13908
1513B	AND Sequences bitmasks, combinatorics, constructive algorithms, math	1400	x13698
1305C	Kuroni and Impossible Calculation brute force, combinatorics, math, number theory	1600	x13544
1581A	CQXYM Count Permutations combinatorics, math, number theory	800	x13238
1462E1	Close Tuples (easy version) binary search, combinatorics, math, sortings, two pointers	1500	x13172
629A	Far Relative’s Birthday Cake brute force, combinatorics, constructive algorithms, implementation	800	x13091
1475E	Advertising Agency combinatorics, math, sortings	1600	x12840
1534C	Little Alawn's Puzzle combinatorics, dp, dsu, graphs, math	1300	x12478
1288C	Two Arrays combinatorics, dp	1600	x12260
1215B	The Number of Products combinatorics, dp, implementation	1400	x12051
1007A	Reorder the Array combinatorics, data structures, math, sortings, two pointers	1300	x11975
1567C	Carrying Conundrum bitmasks, combinatorics, dp, math	1600	x11822
1648A	Weird Sum combinatorics, data structures, geometry, math, matrices, sortings	1400	x11701
1569C	Jury Meeting combinatorics, math	1500	x11631
584B	Kolya and Tanya combinatorics	1500	x11568
322B	Ciel and Flowers combinatorics, math	1600	x11478
577B	Modulo Sum combinatorics, data structures, dp, two pointers	1900	x11435
1178C	Tiles combinatorics, greedy, math	1300	x11283
1850G	The Morning Star combinatorics, data structures, geometry, implementation, math, sortings	1500	x11135
1594E1	Rubik's Cube Coloring (easy version) combinatorics, math	1300	x10844
621B	Wet Shark and Bishops combinatorics, implementation	1300	x10776
1236B	Alice and the List of Presents combinatorics, math	1500	x10630
131C	The World is a Theatre combinatorics, math	1400	x10620
1284B	New Year and Ascent Sequence binary search, combinatorics, data structures, dp, implementation, sortings	1400	x10583
1436C	Binary Search binary search, combinatorics	1500	x10518
1096B	Substring Removal combinatorics, math, strings	1300	x10327
152C	Pocket Book combinatorics	1400	x10245
1105C	Ayoub and Lost Array combinatorics, dp, math	1500	x10114
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x9900
1400D	Zigzags brute force, combinatorics, data structures, math, two pointers	1900	x9781
804B	Minimum number of steps combinatorics, greedy, implementation, math	1400	x9512
1767D	Playoff combinatorics, constructive algorithms, dp, greedy, math	1500	x9383
1699C	The Third Problem combinatorics, constructive algorithms, math	1700	x9377
978E	Bus Video System combinatorics, math	1400	x9214
1462E2	Close Tuples (hard version) binary search, combinatorics, implementation, math, sortings, two pointers	1700	x9197
1301C	Ayoub's function binary search, combinatorics, greedy, math, strings	1700	x9047
1312D	Count the Arrays combinatorics, math	1700	x8918
300C	Beautiful Numbers brute force, combinatorics	1800	x8844
1762C	Binary Strings are Fun combinatorics, math	1400	x8830
1907E	Good Triples brute force, combinatorics, number theory	1600	x8712
1739C	Card Game combinatorics, constructive algorithms, dp, games	1500	x8683
1036C	Classy Numbers combinatorics, dp	1900	x8524
1327E	Count The Blocks combinatorics, dp, math	1800	x8494
1528B	Kavi on Pairing Duty combinatorics, dp, math	1700	x8449
1795D	Triangle Coloring combinatorics, math	1600	x8427
1598D	Training Session combinatorics, data structures, geometry, implementation, math	1700	x8388
553A	Kyoya and Colored Balls combinatorics, dp, math	1500	x8369
1715C	Monoblock combinatorics, data structures, implementation, math	1700	x8315
1557C	Moamen and XOR bitmasks, combinatorics, dp, math, matrices	1700	x8312
1422C	Bargain combinatorics, dp, math	1700	x8068
1789C	Serval and Toxel's Arrays combinatorics, dp, implementation, math	1500	x8030
1452D	Radio Towers combinatorics, dp, math	1600	x7746
1284C	New Year and Permutation combinatorics, math	1600	x7702
1195D1	Submarine in the Rybinsk Sea (easy edition) combinatorics, math, number theory	1500	x7659
888D	Almost Identity Permutations combinatorics, dp, math	1600	x7592
1084C	The Fair Nut and String combinatorics, dp, implementation	1500	x7507
1876B	Effects of Anti Pimples combinatorics, number theory, sortings	1500	x7451

←