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Codeforces Round (Div. 2)
2 days
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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
2052H
Hunting Hoglins in Hogwarts
interactive
3500
x37
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x112
1987H
Fumo Temple
interactive
3500
x113
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x122
1991I
Grid Game
constructive algorithms
,
games
,
graph matchings
,
greedy
,
interactive
3500
x136
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x146
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x172
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x198
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x225
1147F
Zigzag Game
games
,
interactive
3500
x270
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x382
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
3500
x714
1442F
Differentiating Games
games
,
interactive
3400
x144
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x157
1299E
So Mean
interactive
,
math
3400
x176
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x205
1578I
Interactive Rays
geometry
,
interactive
3300
x63
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x265
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x400
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x481
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x134
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x175
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x183
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x214
1482G
Vabank
binary search
,
interactive
3200
x307
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x323
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x366
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x408
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x490
1142E
Pink Floyd
graphs
,
interactive
3200
x529
1970D3
Arithmancy (Hard)
interactive
3100
x122
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x212
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x399
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x469
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x54
1201E2
Knightmare (hard)
graphs
,
interactive
,
shortest paths
3000
x150
1906C
Cursed Game
interactive
3000
x206
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x311
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x332
1147E
Rainbow Coins
interactive
3000
x348
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x378
1007C
Guess two numbers
binary search
,
interactive
3000
x420
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x546
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x564
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x583
1028G
Guess the number
dp
,
interactive
3000
x589
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x669
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x867
927A
BuberPool Taxi Optimization
*special problem
,
interactive
2900
x1
1201E1
Knightmare (easy)
graphs
,
interactive
,
shortest paths
2900
x133
2061G
Kevin and Teams
constructive algorithms
,
graphs
,
interactive
2900
x340
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x343
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x347
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x411
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x607
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x628
1423M
Milutin's Plums
interactive
2800
x248
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x328
2031F
Penchick and Even Medians
binary search
,
constructive algorithms
,
interactive
,
probabilities
2800
x342
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x405
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x422
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x508
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x671
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x677
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x686
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x724
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x1138
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x1200
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x316
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x459
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x459
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x512
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x538
2022D2
Asesino (Hard Version)
constructive algorithms
,
dp
,
interactive
2700
x608
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x637
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x1032
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x1456
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1526
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x231
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x333
1773H
Hot and Cold
binary search
,
interactive
2600
x386
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x423
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x464
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x478
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x733
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x810
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x885
1990E2
Catch the Mole(Hard Version)
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
interactive
,
trees
2600
x923
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x928
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x1063
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x1096
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1748
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x2299
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x315
1089C
Cactus Search
interactive
2500
x437
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x503
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x714
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x834
1100D
Dasha and Chess
constructive algorithms
,
games
,
interactive
2500
x882
1990E1
Catch the Mole(Easy Version)
binary search
,
data structures
,
dfs and similar
,
interactive
,
trees
2500
x988
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