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Before contest
Codeforces Round 941 (Div. 1)
29:00:03
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Before contest
Codeforces Round 941 (Div. 2)
29:00:03
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constructive algorithms
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
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probabilities
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Custom test
Problems
#
Name
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x14
1193C
Scissors and Tape
*special problem
,
constructive algorithms
,
geometry
x35
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x37
1170H
Longest Saw
*special problem
,
constructive algorithms
x43
1912C
Cactus Transformation
constructive algorithms
3300
x45
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x47
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x56
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x58
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x64
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x64
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x69
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x69
737F
Dirty plates
constructive algorithms
,
math
3300
x69
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x72
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x72
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x72
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x76
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x78
1276E
Four Stones
constructive algorithms
3500
x78
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x78
1349E
Slime and Hats
constructive algorithms
,
dp
,
greedy
3500
x81
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x81
1533G
Biome Map
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
x86
1078E
Negative Time Summation
constructive algorithms
3400
x86
1218G
Alpha planetary system
constructive algorithms
,
graphs
,
shortest paths
3000
x87
1770H
Koxia, Mahiru and Winter Festival
constructive algorithms
3500
x88
1656I
Neighbour Ordering
constructive algorithms
,
graphs
3500
x93
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x95
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x96
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x97
720C
Homework
constructive algorithms
3100
x97
198D
Cube Snake
constructive algorithms
2700
x100
1267H
Help BerLine
constructive algorithms
3200
x101
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
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x110
1887F
Minimum Segments
constructive algorithms
3400
x112
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
1045E
Ancient civilizations
constructive algorithms
,
geometry
3200
x118
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x121
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x123
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x123
1242E
Planar Perimeter
constructive algorithms
,
graphs
3200
x127
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x128
1774H
Maximum Permutation
constructive algorithms
3500
x129
1530G
What a Reversal
constructive algorithms
3300
x132
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x133
48H
Black and White
constructive algorithms
2800
x133
74E
Shift It!
constructive algorithms
2800
x142
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x143
1302B
DAG
constructive algorithms
x143
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x144
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x147
317E
Princess and Her Shadow
constructive algorithms
,
shortest paths
3100
x151
1758F
Decent Division
constructive algorithms
,
data structures
3000
x152
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x156
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x157
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x162
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x163
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x167
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x169
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x170
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x171
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x176
1740G
Dangerous Laser Power
constructive algorithms
,
dsu
,
sortings
3100
x177
98D
Help Monks
constructive algorithms
2500
x179
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x182
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x185
1053E
Euler tour
constructive algorithms
,
trees
3500
x193
290E
HQ
*special problem
,
constructive algorithms
2500
x195
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x203
1267D
DevOps Best Practices
constructive algorithms
2800
x206
398C
Tree and Array
constructive algorithms
x207
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x208
1060H
Sophisticated Device
constructive algorithms
3300
x209
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x211
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x213
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x213
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x215
331E2
Deja Vu
constructive algorithms
,
dp
3100
x216
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x218
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x221
1949K
Make Triangle
constructive algorithms
,
math
x222
952G
Puzzling Language
constructive algorithms
2200
x224
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x226
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x233
715D
Create a Maze
constructive algorithms
3100
x233
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x235
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x241
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
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x246
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x248
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x249
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x251
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x252
774H
Repairing Of String
*special problem
,
constructive algorithms
2200
x254
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x257
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