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Before contest
Codeforces Round 941 (Div. 1)
07:46:40
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Before contest
Codeforces Round 941 (Div. 2)
07:46:40
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constructive algorithms
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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
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implementation
interactive
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probabilities
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Problems
#
Name
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x58
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x69
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x69
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x72
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x72
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x76
1276E
Four Stones
constructive algorithms
3500
x78
1349E
Slime and Hats
constructive algorithms
,
dp
,
greedy
3500
x81
1770H
Koxia, Mahiru and Winter Festival
constructive algorithms
3500
x88
1656I
Neighbour Ordering
constructive algorithms
,
graphs
3500
x93
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x96
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x102
1685D2
Permutation Weight (Hard Version)
constructive algorithms
,
greedy
3500
x102
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x106
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x123
1774H
Maximum Permutation
constructive algorithms
3500
x129
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x133
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x143
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x144
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x156
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x167
1053E
Euler tour
constructive algorithms
,
trees
3500
x193
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x212
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x213
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x227
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x327
1267C
Cactus Revenge
constructive algorithms
3500
x378
1264F
Beautiful Fibonacci Problem
constructive algorithms
,
number theory
3500
x833
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x56
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x64
1078E
Negative Time Summation
constructive algorithms
3400
x86
1887F
Minimum Segments
constructive algorithms
3400
x112
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x121
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x157
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x235
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x357
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x405
1097E
Egor and an RPG game
constructive algorithms
,
greedy
3400
x458
1912C
Cactus Transformation
constructive algorithms
3300
x45
737F
Dirty plates
constructive algorithms
,
math
3300
x69
1737F
Ela and Prime GCD
constructive algorithms
,
math
,
number theory
3300
x117
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x118
1530G
What a Reversal
constructive algorithms
3300
x132
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x147
1060H
Sophisticated Device
constructive algorithms
3300
x210
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x215
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x257
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x280
1237H
Balanced Reversals
constructive algorithms
3300
x303
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x314
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x394
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x411
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x37
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x72
1267H
Help BerLine
constructive algorithms
3200
x101
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x110
1045E
Ancient civilizations
constructive algorithms
,
geometry
3200
x118
1242E
Planar Perimeter
constructive algorithms
,
graphs
3200
x127
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x170
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x185
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x213
1656G
Cycle Palindrome
constructive algorithms
,
graphs
,
math
3200
x269
543E
Listening to Music
constructive algorithms
,
data structures
3200
x276
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x296
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x313
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x319
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x363
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x457
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x576
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x600
1025G
Company Acquisitions
constructive algorithms
,
math
3200
x608
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x97
720C
Homework
constructive algorithms
3100
x97
317E
Princess and Her Shadow
constructive algorithms
,
shortest paths
3100
x151
1740G
Dangerous Laser Power
constructive algorithms
,
dsu
,
sortings
3100
x177
331E2
Deja Vu
constructive algorithms
,
dp
3100
x216
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x233
715D
Create a Maze
constructive algorithms
3100
x233
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x252
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x272
1882E2
Two Permutations (Hard Version)
constructive algorithms
3100
x280
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x326
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x327
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x329
1168E
Xor Permutations
constructive algorithms
,
math
3100
x353
1329D
Dreamoon Likes Strings
constructive algorithms
,
data structures
3100
x367
1119G
Get Ready for the Battle
constructive algorithms
,
implementation
3100
x409
804E
The same permutation
constructive algorithms
3100
x409
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x441
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x521
1110G
Tree-Tac-Toe
constructive algorithms
,
games
,
trees
3100
x574
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x64
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x81
1218G
Alpha planetary system
constructive algorithms
,
graphs
,
shortest paths
3000
x87
1758F
Decent Division
constructive algorithms
,
data structures
3000
x152
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x175
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x225
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x244
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x244
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x252
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