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Before contest
Codeforces Round 941 (Div. 1)
2 days
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Before contest
Codeforces Round 941 (Div. 2)
2 days
Register now »
*has extra registration
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brute force
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
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number theory
probabilities
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ternary search
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Name
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1681
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1689
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1729
1194E
Count The Rectangles
bitmasks
,
brute force
,
data structures
,
geometry
,
sortings
2200
x1729
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1740
785E
Anton and Permutation
brute force
,
data structures
2200
x1776
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1806
1622E
Math Test
bitmasks
,
brute force
,
greedy
2200
x1829
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1836
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x1940
1500B
Two chandeliers
binary search
,
brute force
,
chinese remainder theorem
,
math
,
number theory
2200
x1983
1166D
Cute Sequences
binary search
,
brute force
,
greedy
,
math
2200
x2023
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2051
1461E
Water Level
brute force
,
graphs
,
greedy
,
implementation
,
math
2200
x2059
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2071
1695D1
Tree Queries (Easy Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x2079
1311E
Construct the Binary Tree
brute force
,
constructive algorithms
,
trees
2200
x2130
1704E
Count Seconds
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
2200
x2211
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2285
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x2289
1196F
K-th Path
brute force
,
constructive algorithms
,
shortest paths
,
sortings
2200
x2299
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2310
547A
Mike and Frog
brute force
,
greedy
,
implementation
,
math
2200
x2310
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2347
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2379
1848D
Vika and Bonuses
binary search
,
brute force
,
math
,
ternary search
2200
x2504
1154G
Minimum Possible LCM
brute force
,
greedy
,
math
,
number theory
2200
x2613
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2671
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2678
1373E
Sum of Digits
brute force
,
constructive algorithms
,
dp
,
greedy
2200
x2691
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2787
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x2958
1327D
Infinite Path
brute force
,
dfs and similar
,
graphs
,
math
,
number theory
2200
x3022
1353F
Decreasing Heights
brute force
,
dp
2200
x3052
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3311
1520G
To Go Or Not To Go?
brute force
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x3478
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6161
215C
Crosses
brute force
,
implementation
2100
x478
54D
Writing a Song
brute force
,
dp
,
strings
2100
x503
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x549
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x608
475C
Kamal-ol-molk's Painting
brute force
,
constructive algorithms
,
greedy
2100
x777
217B
Blackboard Fibonacci
brute force
,
math
2100
x853
457C
Elections
brute force
2100
x860
1184A2
Heidi Learns Hashing (Medium)
brute force
,
number theory
2100
x928
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1384
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1408
1098B
Nice table
brute force
,
constructive algorithms
,
greedy
,
math
2100
x1465
993C
Careful Maneuvering
bitmasks
,
brute force
,
geometry
2100
x1478
992D
Nastya and a Game
brute force
,
implementation
,
math
2100
x1582
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1605
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1650
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1676
1183F
Topforces Strikes Back
brute force
,
math
,
sortings
2100
x1762
1185F
Two Pizzas
bitmasks
,
brute force
2100
x1799
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x1844
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1967
799D
Field expansion
brute force
,
dp
,
meet-in-the-middle
2100
x1969
990E
Post Lamps
brute force
,
greedy
2100
x1973
103D
Time to Raid Cowavans
brute force
,
data structures
,
sortings
2100
x1979
340B
Maximal Area Quadrilateral
brute force
,
geometry
2100
x2018
767B
The Queue
brute force
,
greedy
2100
x2104
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2143
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2229
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2231
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2347
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2351
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2422
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2451
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2452
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2523
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2584
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2599
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2661
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2722
1472F
New Year's Puzzle
brute force
,
dp
,
graph matchings
,
greedy
,
sortings
2100
x2931
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2957
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x2967
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3029
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3134
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3176
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3231
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x3294
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x3360
1333D
Challenges in school №41
brute force
,
constructive algorithms
,
games
,
graphs
,
greedy
,
implementation
,
sortings
2100
x3630
988E
Divisibility by 25
brute force
,
greedy
2100
x3634
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3780
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3951
1389D
Segment Intersections
brute force
,
greedy
,
implementation
,
math
2100
x4021
1433G
Reducing Delivery Cost
brute force
,
graphs
,
shortest paths
2100
x4090
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4186
1360H
Binary Median
binary search
,
bitmasks
,
brute force
,
constructive algorithms
2100
x4276
1006F
Xor-Paths
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2100
x4621
1207F
Remainder Problem
brute force
,
data structures
,
implementation
2100
x4713
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4731
1343E
Weights Distributing
brute force
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x4802
1372D
Omkar and Circle
brute force
,
dp
,
games
,
greedy
2100
x5285
250E
Mad Joe
brute force
2000
x438
34E
Collisions
brute force
,
implementation
,
math
2000
x563
435D
Special Grid
brute force
,
dp
,
greedy
2000
x745
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