Problemset - Codeforces

Codeforces and Polygon may be unavailable from December 6, 19:00 (UTC) to December 6, 21:00 (UTC) due to technical maintenance. ×

→ Pay attention

Before contest
Codeforces Round 991 (Div. 3)
12:25:07
Register now »

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
630M	Turn geometry, math	1800	x1186
626D	Jerry's Protest brute force, combinatorics, dp, probabilities	1800	x2774
623A	Graph and String constructive algorithms, graphs	1800	x4508
612D	The Union of k-Segments greedy, sortings	1800	x3916
610C	Harmony Analysis constructive algorithms	1800	x2887
603B	Moodular Arithmetic combinatorics, dfs and similar, dsu, math, number theory	1800	x2590
600C	Make Palindrome constructive algorithms, greedy, strings	1800	x6309
592C	The Big Race math	1800	x3073
585A	Gennady the Dentist brute force, implementation	1800	x4342
584D	Dima and Lisa brute force, math, number theory	1800	x9493
580D	Kefa and Dishes bitmasks, dp	1800	x9970
575H	Bots combinatorics, dp, math, number theory	1800	x1712
551B	ZgukistringZ brute force, constructive algorithms, implementation, strings	1800	x3861
543A	Writing Code dp	1800	x8023
538D	Weird Chess brute force, constructive algorithms, implementation	1800	x2433
533E	Correcting Mistakes constructive algorithms, dp, greedy, hashing, strings, two pointers	1800	x2277
527D	Clique Problem data structures, dp, greedy, implementation, sortings	1800	x4808
519D	A and B and Interesting Substrings data structures, dp, two pointers	1800	x6405
513G1	Inversions problem brute force, dfs and similar, dp, meet-in-the-middle	1800	x1794
513B2	Permutations bitmasks, divide and conquer, math	1800	x2640
492D	Vanya and Computer Game binary search, implementation, math, sortings	1800	x3179
487A	Fight the Monster binary search, brute force, implementation	1800	x3777
483B	Friends and Presents binary search, math	1800	x4102
482B	Interesting Array constructive algorithms, data structures, trees	1800	x6597
478C	Table Decorations greedy	1800	x18411
471D	MUH and Cube Walls string suffix structures, strings	1800	x8327
470B	Hexakosioihexekontahexaphobia *special problem	1800	x260
459D	Pashmak and Parmida's problem data structures, divide and conquer, sortings	1800	x10327
452B	4-point polyline brute force, constructive algorithms, geometry, trees	1800	x2013
448D	Multiplication Table binary search, brute force	1800	x14297
442B	Andrey and Problem greedy, math, probabilities	1800	x5284
440C	One-Based Arithmetic brute force, dfs and similar, divide and conquer	1800	x922
436C	Dungeons and Candies dsu, graphs, greedy, trees	1800	x2684
433C	Ryouko's Memory Note implementation, math, sortings	1800	x2497
432C	Prime Swaps greedy, sortings	1800	x2531
420B	Online Meeting implementation	1800	x1047
409E	Dome *special problem	1800	x579
404C	Restore Graph dfs and similar, graphs, sortings	1800	x5256
402D	Upgrading Array dp, greedy, math, number theory	1800	x2633
371D	Vessels data structures, dsu, implementation, trees	1800	x5718
370C	Mittens constructive algorithms, greedy, sortings	1800	x1588
363D	Renting Bikes binary search, greedy	1800	x3982
358D	Dima and Hares dp, greedy	1800	x4095
351A	Jeff and Rounding dp, greedy, implementation, math	1800	x2930
336C	Vasily the Bear and Sequence brute force, greedy, implementation, number theory	1800	x2483
333B	Chips greedy	1800	x2655
328A	IQ Test implementation	1800	x2093
325B	Stadium and Games binary search, math	1800	x1580
301A	Yaroslav and Sequence constructive algorithms	1800	x3094
300C	Beautiful Numbers brute force, combinatorics	1800	x9693
280B	Maximum Xor Secondary data structures, implementation, two pointers	1800	x4760
274B	Zero Tree dfs and similar, dp, greedy, trees	1800	x5051
271D	Good Substrings data structures, strings	1800	x11543
263D	Cycle in Graph dfs and similar, graphs	1800	x3642
257C	View Angle brute force, geometry, math	1800	x4393
255D	Mr. Bender and Square binary search, implementation, math	1800	x2015
254C	Anagram greedy, strings	1800	x1502
252B	Unsorting Array brute force, sortings	1800	x1723
251B	Playing with Permutations implementation, math	1800	x1279
245H	Queries for Number of Palindromes dp, hashing, strings	1800	x6877
242C	King's Path dfs and similar, graphs, hashing, shortest paths	1800	x8803
238B	Boring Partition constructive algorithms	1800	x1334
234F	Fence dp	1800	x1753
222C	Reducing Fractions implementation, math, number theory, sortings	1800	x2269
220B	Little Elephant and Array constructive algorithms, data structures	1800	x10462
216C	Hiring Staff greedy	1800	x1853
207D9	The Beaver's Problem - 3	1800	x88
207D1	The Beaver's Problem - 3	1800	x117
207A2	Beaver's Calculator 1.0 greedy	1800	x244
201B	Guess That Car! math, ternary search	1800	x1293
200D	Programming Language binary search, brute force, expression parsing, implementation	1800	x916
200C	Football Championship brute force, implementation	1800	x1062
195C	Try and Catch expression parsing, implementation	1800	x1148
190B	Surrounded geometry	1800	x2859
188H	Stack *special problem, expression parsing, implementation	1800	x267
187B	AlgoRace dp, shortest paths	1800	x1997
185B	Mushroom Scientists math, ternary search	1800	x1643
182E	Wooden Fence dp	1800	x1464
180E	Cubes binary search, dp, two pointers	1800	x1794
180A	Defragmentation implementation	1800	x541
178F1	Representative Sampling	1800	x406
178B3	Greedy Merchants	1800	x1234
177F1	Script Generation	1800	x305
174C	Range Increments data structures, greedy	1800	x1134
173B	Chamber of Secrets dfs and similar, shortest paths	1800	x3213
167B	Wizards and Huge Prize dp, math, probabilities	1800	x2172
162J	Brackets *special problem	1800	x96
162H	Alternating case *special problem	1800	x220
162F	Factorial zeros *special problem	1800	x202
162E	HQ9+ *special problem	1800	x178
162C	Prime factorization *special problem	1800	x835
162B	Binary notation *special problem	1800	x314
161D	Distance in Tree dfs and similar, dp, trees	1800	x15230
153B	Binary notation *special problem	1800	x157
148D	Bag of mice dp, games, math, probabilities	1800	x7367
145B	Lucky Number 2 constructive algorithms	1800	x2223
142B	Help General constructive algorithms, greedy, implementation	1800	x2223
141C	Queue constructive algorithms, greedy, sortings	1800	x2472
140D	New Year Contest greedy, sortings	1800	x2218
140C	New Year Snowmen binary search, data structures, greedy	1800	x4392