Problemset - Codeforces

Please read the new rule regarding the restriction on the use of AI tools. ×

→ Pay attention

Before contest
Codeforces Round (Div. 2)
6 days

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1525D	Armchairs dp, flows, graph matchings, greedy	1800	x9773
1525C	Robot Collisions data structures, greedy, implementation, sortings	2000	x4465
1525B	Permutation Sort constructive algorithms, greedy	900	x24752
1525A	Potion-making math, number theory	800	x25375
1523H	Hopping Around the Array data structures, dp	3500	x246
1523G	Try Booking data structures, divide and conquer	3200	x465
1523F	Favorite Game bitmasks, dp	3300	x418
1523E	Crypto Lights combinatorics, dp, math, probabilities	2600	x1677
1523D	Love-Hate bitmasks, brute force, dp, probabilities	2400	x2174
1523C	Compression and Expansion brute force, data structures, greedy, implementation, trees	1600	x8772
1523B	Lord of the Values constructive algorithms	1100	x12096
1523A	Game of Life implementation	800	x13488
1521E	Nastia and a Beautiful Matrix binary search, constructive algorithms, dp, greedy	2700	x676
1521D	Nastia Plays with a Tree constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees	2500	x1958
1521C	Nastia and a Hidden Permutation constructive algorithms, interactive	2000	x4357
1521B	Nastia and a Good Array constructive algorithms, math, number theory	1300	x21356
1521A	Nastia and Nearly Good Numbers constructive algorithms, math, number theory	1000	x37157
1520G	To Go Or Not To Go? brute force, dfs and similar, graphs, greedy, implementation, shortest paths	2200	x3701
1520F2	Guess the K-th Zero (Hard version) binary search, constructive algorithms, data structures, interactive	2200	x3011
1520F1	Guess the K-th Zero (Easy version) binary search, interactive	1600	x11749
1520E	Arranging The Sheep greedy, math	1400	x21421
1520D	Same Differences data structures, hashing, math	1200	x46917
1520C	Not Adjacent Matrix constructive algorithms	1000	x31745
1520B	Ordinary Numbers brute force, math, number theory	800	x44433
1520A	Do Not Be Distracted! brute force, implementation	800	x51673
1519F	Chests and Keys bitmasks, brute force, dfs and similar, dp, flows	3200	x414
1519E	Off by One constructive algorithms, dfs and similar, geometry, graphs, sortings, trees	2700	x820
1519D	Maximum Sum of Products brute force, dp, implementation, math, two pointers	1600	x15253
1519C	Berland Regional brute force, data structures, greedy, number theory, sortings	1400	x16947
1519B	The Cake Is a Lie dp, math	800	x30851
1519A	Red and Blue Beans math	800	x28820
1517H	Fly Around the World dp, geometry	3500	x71
1517G	Starry Night Camping constructive algorithms, flows, graphs	3300	x492
1517F	Reunion combinatorics, dp, trees	3200	x460
1517E	Group Photo binary search, data structures, implementation, two pointers	2500	x967
1517D	Explorer Space dp, graphs, shortest paths	1800	x7711
1517C	Fillomino 2 constructive algorithms, dfs and similar, greedy, implementation	1400	x13364
1517B	Morning Jogging constructive algorithms, greedy, sortings	1200	x13253
1517A	Sum of 2050 greedy, math	800	x25514
1516E	Baby Ehab Plays with Permutations combinatorics, dp, math	2500	x869
1516D	Cut binary search, data structures, dp, graphs, number theory, two pointers	2100	x4361
1516C	Baby Ehab Partitions Again bitmasks, constructive algorithms, dp, math	1700	x11959
1516B	AGAGA XOOORRR bitmasks, brute force, dp, greedy	1500	x19381
1516A	Tit for Tat greedy	800	x23397
1515I	Phoenix and Diamonds binary search, data structures, sortings	3400	x281
1515H	Phoenix and Bits bitmasks, brute force, data structures, sortings	3500	x233
1515G	Phoenix and Odometers dfs and similar, graphs, math, number theory	2700	x1009
1515F	Phoenix and Earthquake constructive algorithms, dfs and similar, dsu, graphs, greedy, trees	2600	x1782
1515E	Phoenix and Computers combinatorics, dp, math	2200	x3569
1515D	Phoenix and Socks greedy, sortings, two pointers	1500	x11408
1515C	Phoenix and Towers constructive algorithms, data structures, greedy	1400	x17115
1515B	Phoenix and Puzzle brute force, geometry, math, number theory	1000	x24902
1515A	Phoenix and Gold constructive algorithms, greedy, math	800	x20226
1514E	Baby Ehab's Hyper Apartment binary search, graphs, interactive, sortings, two pointers	2700	x615
1514D	Cut and Stick binary search, data structures, greedy, implementation, sortings	2000	x4308
1514C	Product 1 Modulo N greedy, number theory	1600	x15140
1514B	AND 0, Sum Big bitmasks, combinatorics, math	1200	x24944
1514A	Perfectly Imperfect Array math, number theory	800	x24129
1513F	Swapping Problem brute force, constructive algorithms, data structures, sortings	2500	x1277
1513E	Cost Equilibrium combinatorics, constructive algorithms, math, sortings	2300	x1510
1513D	GCD and MST constructive algorithms, dsu, graphs, greedy, number theory, sortings	2000	x5402
1513C	Add One dp, matrices	1600	x14016
1513B	AND Sequences bitmasks, combinatorics, constructive algorithms, math	1400	x14725
1513A	Array and Peaks constructive algorithms, implementation	800	x19366
1512G	Short Task brute force, dp, math, number theory	1700	x8150
1512F	Education brute force, dp, greedy, implementation	1900	x6233
1512E	Permutation by Sum brute force, greedy, math	1600	x10476
1512D	Corrupted Array constructive algorithms, data structures, greedy	1200	x22562
1512C	A-B Palindrome constructive algorithms, implementation, strings	1200	x20185
1512B	Almost Rectangle implementation	800	x25371
1512A	Spy Detected! brute force, implementation	800	x64112
1511G	Chips on a Board bitmasks, brute force, data structures, dp, games, two pointers	2700	x783
1511F	Chainword brute force, data structures, dp, matrices, string suffix structures, strings	2700	x441
1511E	Colorings and Dominoes combinatorics, dp, greedy, math	2100	x2594
1511D	Min Cost String brute force, constructive algorithms, graphs, greedy, strings	1600	x11497
1511C	Yet Another Card Deck brute force, data structures, implementation, trees	1100	x23827
1511B	GCD Length constructive algorithms, math, number theory	1100	x22900
1511A	Review Site greedy	800	x27583
1510K	King's Task brute force, graphs, implementation	1200	x5453
1510J	Japanese Game constructive algorithms, math	2700	x523
1510I	Is It Rated? greedy, interactive, math, probabilities	2700	x482
1510H	Hard Optimization dp	3200	x98
1510G	Guide	2100	x1296
1510F	Fiber Shape	2800	x58
1510E	Equilibrium Point /\textbackslash/\textbackslash	2700	x255
1510D	Digits dp, math, number theory	2100	x1904
1510C	Cactus Not Enough dfs and similar, graph matchings, graphs	2900	x215
1510B	Button Lock flows, graph matchings, graphs	2600	x746
1510A	ASCII Automata Art	3100	x154
1509C	The Sports Festival dp, greedy	1800	x12555
1509B	TMT Document greedy	1100	x21601
1509A	Average Height constructive algorithms	800	x25989
1508F	Optimal Encoding brute force, data structures	3500	x125
1508E	Tree Calendar brute force, constructive algorithms, data structures, dfs and similar, sortings, trees	3100	x346
1508D	Swap Pass constructive algorithms, geometry, sortings	3000	x572
1508C	Complete the MST bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees	2500	x1496
1508B	Almost Sorted binary search, combinatorics, constructive algorithms, implementation	1800	x3996
1508A	Binary Literature constructive algorithms, greedy, implementation, strings, two pointers	1900	x6228
1506G	Maximize the Remaining String brute force, data structures, dp, greedy, strings	2000	x4315
1506F	Triangular Paths constructive algorithms, graphs, math, shortest paths, sortings	2000	x3279