Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round 941 (Div. 1)
34:03:09
Register now »

*has extra registration

Before contest
Codeforces Round 941 (Div. 2)
34:03:09
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

combinatorics

Add tag

Problems

#	Name
1843C	Sum in Binary Tree bitmasks, combinatorics, math, trees	800	x30944
1743A	Password brute force, combinatorics, implementation, math	800	x26015
1674B	Dictionary combinatorics, math	800	x25567
1499A	Domino on Windowsill combinatorics, constructive algorithms, math	800	x21002
1821A	Matching combinatorics, math	800	x19316
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18344
1823A	A-characteristic combinatorics, constructive algorithms, math	800	x15772
1581A	CQXYM Count Permutations combinatorics, math, number theory	800	x13237
629A	Far Relative’s Birthday Cake brute force, combinatorics, constructive algorithms, implementation	800	x13088
1855B	Longest Divisors Interval brute force, combinatorics, greedy, math, number theory	900	x23567
1543B	Customising the Track combinatorics, greedy, math	900	x22629
1771A	Hossam and Combinatorics combinatorics, math, sortings	900	x21979
1582B	Luntik and Subsequences combinatorics, math	900	x18710
1777B	Emordnilap combinatorics, greedy, math	900	x16550
1166A	Silent Classroom combinatorics, greedy	900	x13856
1840C	Ski Resort combinatorics, math, two pointers	1000	x24406
1674C	Infinite Replacement combinatorics, implementation, strings	1000	x22848
610A	Pasha and Stick combinatorics, math	1000	x21960
1293B	JOE is on TV! combinatorics, greedy, math	1000	x20765
1539A	Contest Start combinatorics, geometry, greedy, math	1000	x19572
1732A	Bestie brute force, combinatorics, constructive algorithms, implementation, math, number theory	1000	x14382
535B	Tavas and SaDDas bitmasks, brute force, combinatorics, implementation	1100	x21548
1840B	Binary Cafe bitmasks, combinatorics, math	1100	x21405
630C	Lucky Numbers combinatorics, math	1100	x20348
1917B	Erase First or Second Letter brute force, combinatorics, data structures, dp, strings	1100	x19205
1827A	Counting Orders combinatorics, math, sortings, two pointers	1100	x17377
1574B	Combinatorics Homework combinatorics, greedy, math	1100	x16988
1272C	Yet Another Broken Keyboard combinatorics, dp, implementation	1200	x25006
1514B	AND 0, Sum Big bitmasks, combinatorics, math	1200	x22608
1922B	Forming Triangles combinatorics, constructive algorithms, math, sortings	1200	x18841
1843D	Apple Tree combinatorics, dfs and similar, dp, math, trees	1200	x16953
459B	Pashmak and Flowers combinatorics, implementation, sortings	1300	x38359
478B	Random Teams combinatorics, constructive algorithms, greedy, math	1300	x35167
476B	Dreamoon and WiFi bitmasks, brute force, combinatorics, dp, math, probabilities	1300	x28938
1328B	K-th Beautiful String binary search, brute force, combinatorics, implementation, math	1300	x28030
1433E	Two Round Dances combinatorics, math	1300	x17989
617B	Chocolate combinatorics	1300	x17282
251A	Points on Line binary search, combinatorics, two pointers	1300	x16542
1862D	Ice Cream Balls binary search, combinatorics, constructive algorithms, math	1300	x15927
1931D	Divisible Pairs combinatorics, math, number theory	1300	x15608
1326C	Permutation Partitions combinatorics, greedy, math	1300	x15208
1879C	Make it Alternating combinatorics, dp, greedy	1300	x14796
1534C	Little Alawn's Puzzle combinatorics, dp, dsu, graphs, math	1300	x12468
1007A	Reorder the Array combinatorics, data structures, math, sortings, two pointers	1300	x11972
1178C	Tiles combinatorics, greedy, math	1300	x11274
1594E1	Rubik's Cube Coloring (easy version) combinatorics, math	1300	x10843
621B	Wet Shark and Bishops combinatorics, implementation	1300	x10774
1096B	Substring Removal combinatorics, math, strings	1300	x10323
844B	Rectangles combinatorics, math	1300	x6977
840A	Leha and Function combinatorics, greedy, math, number theory, sortings	1300	x6953
630F	Selection of Personnel combinatorics, math	1300	x6543
171B	Star *special problem, combinatorics	1300	x3935
414B	Mashmokh and ACM combinatorics, dp, number theory	1400	x20717
1475C	Ball in Berland combinatorics, graphs, math	1400	x19902
1513B	AND Sequences bitmasks, combinatorics, constructive algorithms, math	1400	x13687
1215B	The Number of Products combinatorics, dp, implementation	1400	x12039
1648A	Weird Sum combinatorics, data structures, geometry, math, matrices, sortings	1400	x11687
131C	The World is a Theatre combinatorics, math	1400	x10615
1284B	New Year and Ascent Sequence binary search, combinatorics, data structures, dp, implementation, sortings	1400	x10580
152C	Pocket Book combinatorics	1400	x10243
804B	Minimum number of steps combinatorics, greedy, implementation, math	1400	x9511
978E	Bus Video System combinatorics, math	1400	x9204
1762C	Binary Strings are Fun combinatorics, math	1400	x8818
1866B	Battling with Numbers combinatorics, math, number theory	1400	x7163
630H	Benches combinatorics, math	1400	x4733
124B	Permutations brute force, combinatorics, implementation	1400	x3742
1552B	Running for Gold combinatorics, graphs, greedy, sortings	1500	x14942
1391C	Cyclic Permutations combinatorics, dp, graphs, math	1500	x14529
1462E1	Close Tuples (easy version) binary search, combinatorics, math, sortings, two pointers	1500	x13165
1569C	Jury Meeting combinatorics, math	1500	x11627
584B	Kolya and Tanya combinatorics	1500	x11567
1850G	The Morning Star combinatorics, data structures, geometry, implementation, math, sortings	1500	x11129
1236B	Alice and the List of Presents combinatorics, math	1500	x10618
1436C	Binary Search binary search, combinatorics	1500	x10516
1105C	Ayoub and Lost Array combinatorics, dp, math	1500	x10111
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x9899
1767D	Playoff combinatorics, constructive algorithms, dp, greedy, math	1500	x9377
1739C	Card Game combinatorics, constructive algorithms, dp, games	1500	x8681
553A	Kyoya and Colored Balls combinatorics, dp, math	1500	x8367
1789C	Serval and Toxel's Arrays combinatorics, dp, implementation, math	1500	x8025
1195D1	Submarine in the Rybinsk Sea (easy edition) combinatorics, math, number theory	1500	x7659
1084C	The Fair Nut and String combinatorics, dp, implementation	1500	x7504
1876B	Effects of Anti Pimples combinatorics, number theory, sortings	1500	x7442
1081C	Colorful Bricks combinatorics, dp, math	1500	x6981
608B	Hamming Distance Sum combinatorics, strings	1500	x6467
677C	Vanya and Label bitmasks, combinatorics, implementation, strings	1500	x6271
817B	Makes And The Product combinatorics, implementation, math, sortings	1500	x5539
204A	Little Elephant and Interval binary search, combinatorics, dp	1500	x5517
374B	Inna and Nine combinatorics, greedy	1500	x3229
288B	Polo the Penguin and Houses combinatorics	1500	x2844
1305C	Kuroni and Impossible Calculation brute force, combinatorics, math, number theory	1600	x13528
1475E	Advertising Agency combinatorics, math, sortings	1600	x12835
1288C	Two Arrays combinatorics, dp	1600	x12260
1567C	Carrying Conundrum bitmasks, combinatorics, dp, math	1600	x11817
322B	Ciel and Flowers combinatorics, math	1600	x11471
1907E	Good Triples brute force, combinatorics, number theory	1600	x8688
1795D	Triangle Coloring combinatorics, math	1600	x8416
1452D	Radio Towers combinatorics, dp, math	1600	x7745
1284C	New Year and Permutation combinatorics, math	1600	x7702
888D	Almost Identity Permutations combinatorics, dp, math	1600	x7587

←