Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
4 days
Register now »

*has extra registration

Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
4 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

combinatorics

Add tag

Problems

#	Name
1574F	Occurrences combinatorics, dfs and similar, dp, dsu, fft, graphs	2700	x744
1574E	Coloring combinatorics, constructive algorithms, implementation, math	2500	x1038
1574B	Combinatorics Homework combinatorics, greedy, math	1100	x18218
1569C	Jury Meeting combinatorics, math	1500	x13337
1567C	Carrying Conundrum bitmasks, combinatorics, dp, math	1600	x13152
1559E	Mocha and Stars combinatorics, dp, fft, math, number theory	2200	x2714
1558D	Top-Notch Insertions combinatorics, data structures	2600	x1133
1557C	Moamen and XOR bitmasks, combinatorics, dp, math, matrices	1700	x10490
1556F	Sports Betting bitmasks, combinatorics, dp, graphs, math, probabilities	2500	x1419
1553I	Stairs combinatorics, divide and conquer, dp, fft, math	3400	x313
1553E	Permutation Shift brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math	2100	x3773
1552C	Maximize the Intersections combinatorics, constructive algorithms, geometry, greedy, sortings	1800	x6285
1552B	Running for Gold combinatorics, graphs, greedy, sortings	1500	x16923
1551F	Equidistant Vertices brute force, combinatorics, dfs and similar, dp, trees	2200	x2177
1550D	Excellent Arrays binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers	2300	x2058
1548C	The Three Little Pigs combinatorics, dp, fft, math	2500	x2036
1545C	AquaMoon and Permutations 2-sat, brute force, combinatorics, constructive algorithms, graph matchings, graphs	2800	x767
1545B	AquaMoon and Chess combinatorics, math	1900	x6756
1543B	Customising the Track combinatorics, greedy, math	900	x24473
1542E2	Abnormal Permutation Pairs (hard version) combinatorics, dp, fft, math	2700	x1015
1542E1	Abnormal Permutation Pairs (easy version) combinatorics, dp, fft, math	2400	x1437
1542D	Priority Queue combinatorics, dp, implementation, math, ternary search	2200	x2921
1540B	Tree Array brute force, combinatorics, dp, graphs, math, probabilities, trees	2300	x2988
1539A	Contest Start combinatorics, geometry, greedy, math	1000	x21524
1536F	Omkar and Akmar chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures	2600	x1102
1536E	Omkar and Forest combinatorics, graphs, math, shortest paths	2300	x2734
1534C	Little Alawn's Puzzle combinatorics, dp, dsu, graphs, math	1300	x13792
1530F	Bingo bitmasks, combinatorics, dp, math, probabilities	2600	x992
1528F	AmShZ Farm combinatorics, fft, math	3300	x342
1528E	Mashtali and Hagh Trees combinatorics, dp, trees	2900	x600
1528B	Kavi on Pairing Duty combinatorics, dp, math	1700	x10657
1527D	MEX Tree combinatorics, dfs and similar, implementation, math, trees	2400	x2289
1526E	Oolimry and Suffix Array combinatorics, constructive algorithms, math	2400	x1421
1525E	Assimilation IV combinatorics, dp, math, probabilities, two pointers	2100	x2444
1523E	Crypto Lights combinatorics, dp, math, probabilities	2600	x1921
1517F	Reunion combinatorics, dp, trees	3200	x592
1516E	Baby Ehab Plays with Permutations combinatorics, dp, math	2500	x1005
1515E	Phoenix and Computers combinatorics, dp, math	2200	x4469
1514B	AND 0, Sum Big bitmasks, combinatorics, math	1200	x34892
1513E	Cost Equilibrium combinatorics, constructive algorithms, math, sortings	2300	x1721
1513B	AND Sequences bitmasks, combinatorics, constructive algorithms, math	1400	x20086
1511E	Colorings and Dominoes combinatorics, dp, greedy, math	2100	x2895
1508B	Almost Sorted binary search, combinatorics, constructive algorithms, implementation	1800	x4430
1503E	2-Coloring combinatorics, dp, math	3100	x891
1499F	Diameter Cuts combinatorics, dfs and similar, dp, trees	2400	x1588
1499E	Chaotic Merge combinatorics, dp, math, strings	2400	x1662
1499A	Domino on Windowsill combinatorics, constructive algorithms, math	800	x21966
1495D	BFS Trees combinatorics, dfs and similar, graphs, math, shortest paths, trees	2600	x1537
1488H	Build From Suffixes *special problem, combinatorics, data structures	2800	x70
1487G	String Counting combinatorics, dp, fft, math	2700	x709
1486F	Pairs of Paths combinatorics, data structures, dfs and similar, dp, trees	2600	x812
1485F	Copy or Prefix Sum combinatorics, data structures, dp, sortings	2400	x2331
1477F	Nezzar and Chocolate Bars combinatorics, fft, math, probabilities	3500	x163
1475E	Advertising Agency combinatorics, math, sortings	1600	x17649
1475C	Ball in Berland combinatorics, graphs, math	1400	x27152
1473G	Tiles combinatorics, dp, fft, math	2800	x455
1470E	Strange Permutation binary search, combinatorics, data structures, dp, graphs, implementation, two pointers	3200	x375
1467D	Sum of Paths combinatorics, dp, math	2200	x3995
1466H	Finding satisfactory solutions combinatorics, dp, graphs, greedy, math	3300	x489
1466G	Song of the Sirens combinatorics, divide and conquer, hashing, math, string suffix structures, strings	2600	x1008
1462E2	Close Tuples (hard version) binary search, combinatorics, implementation, math, sortings, two pointers	1700	x11356
1462E1	Close Tuples (easy version) binary search, combinatorics, math, sortings, two pointers	1500	x15213
1454E	Number of Simple Paths combinatorics, dfs and similar, graphs, trees	2000	x6611
1452D	Radio Towers combinatorics, dp, math	1600	x8684
1450H2	Multithreading (Hard Version) combinatorics, implementation, math	3300	x277
1450H1	Multithreading (Easy Version) combinatorics, fft, math	2900	x513
1444B	Divide and Sum combinatorics, math, sortings	1900	x6773
1442B	Identify the Operations combinatorics, data structures, dsu, greedy, implementation	1800	x5291
1439D	INOI Final Contests combinatorics, dp, fft	3100	x476
1437F	Emotional Fishermen combinatorics, dp, math, two pointers	2600	x1607
1436F	Sum Over Subsets combinatorics, math, number theory	2800	x621
1436C	Binary Search binary search, combinatorics	1500	x11665
1433E	Two Round Dances combinatorics, math	1300	x19832
1426F	Number of Subsequences combinatorics, dp, strings	2000	x6157
1425D	Danger of Mad Snakes combinatorics, dp, math	2300	x898
1422C	Bargain combinatorics, dp, math	1700	x8842
1420D	Rescue Nibel! combinatorics, data structures, sortings	1800	x8325
1418E	Expected Damage binary search, combinatorics, probabilities	2400	x2187
1408G	Clusterization Counting combinatorics, dp, dsu, fft, graphs, trees	2700	x1298
1403C	Chess Rush *special problem, combinatorics, dp, implementation, math	3200	x75
1402C	Star Trek *special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees	2600	x233
1400G	Mercenaries bitmasks, brute force, combinatorics, dp, dsu, math, two pointers	2600	x1159
1400D	Zigzags brute force, combinatorics, data structures, math, two pointers	1900	x11387
1392H	ZS Shuffles Cards combinatorics, dp, math, probabilities	3000	x987
1391C	Cyclic Permutations combinatorics, dp, graphs, math	1500	x16023
1383E	Strange Operation combinatorics, data structures, dp	2800	x1027
1371E2	Asterism (Hard Version) binary search, combinatorics, dp, math, number theory, sortings	2300	x2513
1371E1	Asterism (Easy Version) binary search, brute force, combinatorics, math, number theory, sortings	1900	x5527
1366E	Two Arrays binary search, brute force, combinatorics, constructive algorithms, dp, two pointers	2100	x4622
1365G	Secure Password bitmasks, combinatorics, constructive algorithms, interactive, math	2800	x1415
1359E	Modular Stability combinatorics, math, number theory	2000	x6731
1342E	Placing Rooks combinatorics, fft, math	2300	x3547
1336E2	Chiori and Doll Picking (hard version) bitmasks, brute force, combinatorics, math	3500	x481
1336E1	Chiori and Doll Picking (easy version) bitmasks, brute force, combinatorics, math	2700	x831
1334E	Divisor Paths combinatorics, graphs, greedy, math, number theory	2200	x3178
1332E	Height All the Same combinatorics, constructive algorithms, math, matrices	2100	x4310
1329B	Dreamoon Likes Sequences bitmasks, combinatorics, math	1700	x7056
1328B	K-th Beautiful String binary search, brute force, combinatorics, implementation, math	1300	x32038
1327F	AND Segments bitmasks, combinatorics, data structures, dp, two pointers	2500	x2028
1327E	Count The Blocks combinatorics, dp, math	1800	x9597

The only programming contests Web 2.0 platform

Server time: May/02/2026 13:19:12 (g2).

Desktop version, switch to mobile version.

Supported by