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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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Problems
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Status
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Custom test
Problems
#
Name
2066A
Object Identification
graphs
,
greedy
,
implementation
,
interactive
x3900
2061G
Kevin and Teams
constructive algorithms
,
graphs
,
interactive
2900
x340
2052H
Hunting Hoglins in Hogwarts
interactive
3500
x37
2049E
Broken Queries
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
implementation
,
interactive
2400
x1204
2038G
Guess One Character
constructive algorithms
,
implementation
,
interactive
1900
x2184
2037E
Kachina's Favorite Binary String
dp
,
greedy
,
interactive
,
two pointers
1600
x5784
2036G
Library of Magic
binary search
,
constructive algorithms
,
divide and conquer
,
interactive
,
math
,
number theory
2200
x1313
2032D
Genokraken
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
interactive
,
trees
,
two pointers
1800
x5130
2031F
Penchick and Even Medians
binary search
,
constructive algorithms
,
interactive
,
probabilities
2800
x342
2022D2
Asesino (Hard Version)
constructive algorithms
,
dp
,
interactive
2700
x608
2022D1
Asesino (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
implementation
,
interactive
1900
x3154
2013C
Password Cracking
constructive algorithms
,
interactive
,
strings
1400
x12355
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x11176
1999G2
Ruler (hard version)
binary search
,
interactive
,
ternary search
1700
x8459
1999G1
Ruler (easy version)
binary search
,
interactive
1500
x11518
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
3500
x714
1991I
Grid Game
constructive algorithms
,
games
,
graph matchings
,
greedy
,
interactive
3500
x136
1991E
Coloring Game
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
interactive
1900
x4395
1990E2
Catch the Mole(Hard Version)
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
interactive
,
trees
2600
x923
1990E1
Catch the Mole(Easy Version)
binary search
,
data structures
,
dfs and similar
,
interactive
,
trees
2500
x988
1987H
Fumo Temple
interactive
3500
x113
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x347
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x733
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1997
1970D3
Arithmancy (Hard)
interactive
3100
x122
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x231
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x712
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x24
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7808
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1473
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x7183
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x265
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x172
1919H
Tree Diameter
interactive
,
trees
2000
x152
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1816
1906C
Cursed Game
interactive
3000
x206
1903E
Geo Game
greedy
,
interactive
,
math
2000
x2142
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x366
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x399
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1309
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x3325
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3907
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x11661
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x1096
1856D
More Wrong
divide and conquer
,
interactive
2100
x3364
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x583
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x343
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x3269
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x1023
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2466
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1291
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x332
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x405
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x323
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x3157
1812H
Expected Twist
*special problem
,
interactive
x151
1807E
Interview
binary search
,
implementation
,
interactive
1300
x13907
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x8018
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x5134
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1845
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x714
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x834
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x503
1773H
Hot and Cold
binary search
,
interactive
2600
x386
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x423
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x481
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x546
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x607
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3779
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x122
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x408
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1482
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1267
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x7251
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x422
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x538
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5812
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x628
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x9937
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x4575
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3755
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x874
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x2297
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1534
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x4108
1639K
Treasure Hunt
graphs
,
interactive
1639J
Treasure Hunt
graphs
,
interactive
1639I
Treasure Hunt
graphs
,
interactive
1639H
Treasure Hunt
graphs
,
interactive
1639G
Treasure Hunt
graphs
,
interactive
1639F
Treasure Hunt
graphs
,
interactive
1639E
Treasure Hunt
graphs
,
interactive
1639D
Treasure Hunt
graphs
,
interactive
1639C
Treasure Hunt
graphs
,
interactive
1639B
Treasure Hunt
graphs
,
interactive
1639A
Treasure Hunt
graphs
,
interactive
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4464
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x328
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3259
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3449
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