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Before contest
Codeforces Round 941 (Div. 1)
3 days
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
3 days
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→ Filter Problems
Difficulty:
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interactive
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
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
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1140
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x1123
1205C
Palindromic Paths
implementation
,
interactive
2400
x1115
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x766
1061F
Lost Root
interactive
,
probabilities
2400
x681
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x669
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x283
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1338
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1302
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x890
1100D
Dasha and Chess
constructive algorithms
,
games
,
interactive
2500
x830
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x750
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x634
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x453
1089C
Cactus Search
interactive
2500
x401
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x279
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x1926
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1539
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x998
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x842
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x805
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x727
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x718
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x445
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x373
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x365
1773H
Hot and Cold
binary search
,
interactive
2600
x336
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x298
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1231
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x1108
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x896
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x580
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x501
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x445
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x436
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x422
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x249
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x982
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x914
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x686
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x606
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x578
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x501
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x461
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x359
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x336
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x306
1423M
Milutin's Plums
interactive
2800
x144
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x572
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x544
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x373
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x312
1201E1
Knightmare (easy)
graphs
,
interactive
,
shortest paths
2900
x125
927A
BuberPool Taxi Optimization
*special problem
,
interactive
2900
x1
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x665
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x607
1028G
Guess the number
dp
,
interactive
3000
x527
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x521
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x494
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x458
1007C
Guess two numbers
binary search
,
interactive
3000
x402
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x356
1147E
Rainbow Coins
interactive
3000
x321
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x290
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x252
1906C
Cursed Game
interactive
3000
x160
1201E2
Knightmare (hard)
graphs
,
interactive
,
shortest paths
3000
x140
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x52
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x369
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x328
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x185
1142E
Pink Floyd
graphs
,
interactive
3200
x480
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x457
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x364
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x295
1482G
Vabank
binary search
,
interactive
3200
x261
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x241
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x189
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x168
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x122
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x109
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x428
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x316
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x116
1578I
Interactive Rays
geometry
,
interactive
3300
x58
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x179
1299E
So Mean
interactive
,
math
3400
x148
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x147
1442F
Differentiating Games
games
,
interactive
3400
x127
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x327
1147F
Zigzag Game
games
,
interactive
3500
x237
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x187
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x143
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x130
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x123
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x95
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x85
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