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Codeforces Round 941 (Div. 1)
2 days
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Before contest
Codeforces Round 941 (Div. 2)
2 days
Register now »
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combine-tags-by-or
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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
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
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two pointers
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Problems
#
Name
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1175
1938K
Tree Quiz
2400
x524
1938F
Forming Groups
2400
x626
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1045
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1137
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1160
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x972
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1024
1913E
Matrix Problem
flows
,
graphs
2400
x891
1912H
Hypercatapult Commute
graphs
2400
x369
1912G
Great City Saint Petersburg
data structures
2400
x415
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x77
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1232
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x838
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x884
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1559
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1320
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x949
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1178
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1052
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1062
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x684
1866L
Lihmuf Balling
binary search
,
brute force
,
math
2400
x648
1860E
Fast Travel Text Editor
data structures
,
dfs and similar
,
graphs
,
shortest paths
2400
x1291
1852C
Ina of the Mountain
data structures
,
dp
,
greedy
,
math
2400
x1439
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1441
1844E
Great Grids
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2400
x1680
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1141
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2056
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1783
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1511
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1754
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1493
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1385
1817C
Similar Polynomials
combinatorics
,
math
2400
x915
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x789
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1354
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1038
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1003
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1300
1784D
Wooden Spoon
combinatorics
,
dp
2400
x945
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x665
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1297
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1684
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x811
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1017
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1291
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x559
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x658
1764E
Doremy's Number Line
dp
,
greedy
,
sortings
2400
x1173
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1717
1753D
The Beach
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1658
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1352
1749E
Cactus Wall
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1596
1743E
FTL
binary search
,
dp
2400
x1463
1739E
Cleaning Robot
bitmasks
,
dp
2400
x1164
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1145
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1229
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1021
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1358
1726E
Almost Perfect
combinatorics
,
fft
,
math
2400
x1347
1725L
Lemper Cooking Competition
data structures
2400
x862
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1723
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1509
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1594
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1506
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x463
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2423
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1381
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1649
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1133
1680D
Dog Walking
brute force
,
greedy
,
math
2400
x1109
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x1092
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x766
1670F
Jee, You See?
bitmasks
,
combinatorics
,
dp
2400
x915
1667C
Half Queen Cover
constructive algorithms
,
math
2400
x1509
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1786
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1593
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1455
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1107
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1504
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x1969
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1511
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x854
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1065
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1702
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1394
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1835
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1346
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1398
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x995
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1319
1594F
Ideal Farm
constructive algorithms
,
math
2400
x1258
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1541
1585F
Non-equal Neighbours
combinatorics
,
dp
,
math
2400
x1149
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1011
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1709
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1049
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x234
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1180
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