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Before contest
Codeforces Round 973 (Div. 2)
13:55:43
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→ 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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Status
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Custom test
Problems
#
Name
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x10001
1999G2
Ruler (hard version)
binary search
,
interactive
,
ternary search
1700
x6948
1999G1
Ruler (easy version)
binary search
,
interactive
1500
x9371
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
3500
x490
1991I
Grid Game
constructive algorithms
,
games
,
graph matchings
,
greedy
,
interactive
3500
x59
1991E
Coloring Game
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
interactive
1900
x3958
1990E2
Catch the Mole(Hard Version)
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
interactive
,
trees
2600
x813
1990E1
Catch the Mole(Easy Version)
binary search
,
data structures
,
dfs and similar
,
interactive
,
trees
2500
x875
1987H
Fumo Temple
interactive
3500
x94
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x302
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x642
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1860
1970D3
Arithmancy (Hard)
interactive
3100
x106
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x198
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x569
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x21
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7277
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1356
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6648
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x152
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x150
1919H
Tree Diameter
interactive
,
trees
2000
x142
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1698
1906C
Cursed Game
interactive
3000
x177
1903E
Geo Game
greedy
,
interactive
,
math
2000
x1992
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x343
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x369
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1250
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x3154
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3721
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x11168
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x1059
1856D
More Wrong
divide and conquer
,
interactive
2100
x3234
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x538
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x328
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x3081
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x944
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2353
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1212
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x313
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x375
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x280
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x3022
1812H
Expected Twist
*special problem
,
interactive
x140
1807E
Interview
binary search
,
implementation
,
interactive
1300
x12846
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7589
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4907
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1751
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x671
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x796
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x476
1773H
Hot and Cold
binary search
,
interactive
2600
x356
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x384
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x457
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x526
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x583
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3488
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x110
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x391
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1428
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1215
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x6981
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x399
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x516
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5666
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x605
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x9241
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x4416
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3614
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x814
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x2226
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1435
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3902
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
x4350
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x318
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3168
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3290
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6877
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1778
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4670
1599H
Hidden Fortress
interactive
,
math
2100
x1047
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2221
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3654
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x5369
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x456
1578I
Interactive Rays
geometry
,
interactive
3300
x63
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x129
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x401
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x709
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