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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
3 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
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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Custom test
Problems
#
Name
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x83
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x95
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x121
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x129
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x142
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x186
1147F
Zigzag Game
games
,
interactive
3500
x235
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x326
1442F
Differentiating Games
games
,
interactive
3400
x126
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x146
1299E
So Mean
interactive
,
math
3400
x147
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x178
1578I
Interactive Rays
geometry
,
interactive
3300
x58
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x111
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x315
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x426
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x108
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x121
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x167
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x188
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x239
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x247
1482G
Vabank
binary search
,
interactive
3200
x261
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x361
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x456
1142E
Pink Floyd
graphs
,
interactive
3200
x479
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x184
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x327
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x367
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x51
1201E2
Knightmare (hard)
graphs
,
interactive
,
shortest paths
3000
x139
1906C
Cursed Game
interactive
3000
x157
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x249
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x288
1147E
Rainbow Coins
interactive
3000
x320
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x355
1007C
Guess two numbers
binary search
,
interactive
3000
x399
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x457
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x491
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x517
1028G
Guess the number
dp
,
interactive
3000
x524
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x604
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x642
927A
BuberPool Taxi Optimization
*special problem
,
interactive
2900
x1
1201E1
Knightmare (easy)
graphs
,
interactive
,
shortest paths
2900
x124
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x311
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x372
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x542
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x569
1423M
Milutin's Plums
interactive
2800
x144
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x303
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x335
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x357
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x460
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x478
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x576
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x605
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x686
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x911
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x981
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x248
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x420
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x436
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x443
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x498
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x570
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x894
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x1107
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1226
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x296
1773H
Hot and Cold
binary search
,
interactive
2600
x336
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x364
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x372
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x443
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x717
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x725
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x803
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x841
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x995
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1536
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x1923
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x278
1089C
Cactus Search
interactive
2500
x400
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x453
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x633
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x749
1100D
Dasha and Chess
constructive algorithms
,
games
,
interactive
2500
x827
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x884
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1294
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1333
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x283
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x668
1061F
Lost Root
interactive
,
probabilities
2400
x678
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x765
1205C
Palindromic Paths
implementation
,
interactive
2400
x1113
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1120
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x1122
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1140
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1145
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1174
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