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Codeforces Round 941 (Div. 1)
2 days
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Before contest
Codeforces Round 941 (Div. 2)
2 days
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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
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2521
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2339
1938J
There and Back Again
2100
x1094
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3007
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2153
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2337
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2248
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2324
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3567
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1650
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2668
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x907
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x167
1906J
Count BFS Graph
combinatorics
,
dp
2100
x622
1906F
Maximize The Value
data structures
,
sortings
2100
x921
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1777
1896E
Permutation Sorting
data structures
,
sortings
2100
x1989
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x3301
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2778
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2122
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2260
1866H
Happy Sets
combinatorics
2100
x1516
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1497
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2459
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2598
1856D
More Wrong
divide and conquer
,
interactive
2100
x3062
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2163
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3049
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2782
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2228
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1899
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1714
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2957
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2142
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2030
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2250
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3133
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2169
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2530
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1942
1775E
The Human Equation
greedy
,
implementation
2100
x3009
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2584
1767C
Count Binary Strings
data structures
,
dp
2100
x2491
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3271
1761D
Carry Bit
combinatorics
,
math
2100
x2317
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2653
1734E
Rectangular Congruence
constructive algorithms
,
number theory
2100
x2748
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2451
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2048
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x933
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2347
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3029
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2639
1667B
Optimal Partition
data structures
,
dp
2100
x3465
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1291
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2585
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2773
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2327
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3176
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3006
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3780
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x3955
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3646
1606E
Arena
combinatorics
,
dp
,
math
2100
x3323
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2831
1599H
Hidden Fortress
interactive
,
math
2100
x1007
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2231
1593F
Red-Black Number
dfs and similar
,
dp
,
implementation
,
math
,
meet-in-the-middle
2100
x2321
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1222
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4186
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3853
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3231
1551D2
Domino (hard version)
constructive algorithms
,
implementation
,
math
2100
x2649
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2814
1538G
Gift Set
binary search
,
greedy
,
math
,
ternary search
2100
x4345
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2798
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2890
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1931
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4076
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x2444
1510G
Guide
2100
x1255
1510D
Digits
dp
,
math
,
number theory
2100
x1791
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5437
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4731
1486D
Max Median
binary search
,
data structures
,
dp
2100
x6671
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x2926
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x3893
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4390
1472F
New Year's Puzzle
brute force
,
dp
,
graph matchings
,
greedy
,
sortings
2100
x2931
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2786
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3791
1450C1
Errich-Tac-Toe (Easy Version)
constructive algorithms
,
math
2100
x5298
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3383
1433G
Reducing Delivery Cost
brute force
,
graphs
,
shortest paths
2100
x4090
1433F
Zero Remainder Sum
dp
2100
x5825
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x137
1431F
Neural Network Problem
*special problem
,
binary search
,
greedy
2100
x152
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4489
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3137
1418D
Trash Problem
data structures
,
implementation
2100
x4169
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