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Codeforces Round 945 (Div. 2)
3 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
games
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
1972B
Coin Games
games
900
x14710
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x654
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1012
1970C1
Game on Tree (Easy)
games
1400
x1297
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x11032
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x14197
1965E
Connected Cubes
constructive algorithms
,
games
3100
x169
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x9920
1956B
Nene and the Card Game
games
,
greedy
800
x18782
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18925
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5891
1952E
Sweep Line
combinatorics
,
games
,
math
x209
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x199
1943A
MEX Game 1
games
,
greedy
1300
x15346
1942E
Farm Game
combinatorics
,
games
2300
x1442
1939D
Big Persimmon
*special problem
,
dp
,
games
x59
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1193
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x13377
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x13267
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x8926
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19290
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x170
1919A
Wallet Exchange
games
,
math
800
x31765
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16692
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x11258
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x11158
1906G
Grid Game 2
games
,
number theory
2900
x145
1899A
Game with Integers
games
,
math
,
number theory
800
x38075
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1455
1874A
Jellyfish and Game
brute force
,
games
,
greedy
,
implementation
1200
x15808
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6610
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10567
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x670
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2467
1860C
Game on Permutation
data structures
,
dp
,
games
,
greedy
1400
x12442
1858A
Buttons
games
,
greedy
,
math
800
x34404
1848A
Vika and Her Friends
games
,
math
900
x16237
1844A
Subtraction Game
constructive algorithms
,
games
800
x23874
1842A
Tenzing and Tsondu
games
,
math
800
x19467
1841A
Game with Board
constructive algorithms
,
games
800
x24233
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12650
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1199
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x668
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x695
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x302
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x640
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x757
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x455
1772E
Permutation Game
games
1700
x6400
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3675
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13389
1747C
Swap Game
games
1200
x20355
1740C
Bricks and Bags
constructive algorithms
,
games
,
greedy
,
sortings
1400
x10586
1739C
Card Game
combinatorics
,
constructive algorithms
,
dp
,
games
1500
x8713
1738C
Even Number Addicts
dp
,
games
,
greedy
,
math
1500
x10566
1737C
Ela and Crickets
constructive algorithms
,
games
,
implementation
,
math
1500
x5565
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x6882
1719A
Chip Game
games
,
math
800
x25022
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x466
1704F
Colouring Game
constructive algorithms
,
dp
,
games
2600
x937
1695B
Circle Game
games
,
greedy
1000
x18031
1695A
Subrectangle Guess
games
800
x16112
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x23481
1681A
Game with Cards
games
,
greedy
800
x20735
1673A
Subtle Substring Subtraction
games
,
greedy
,
strings
800
x18226
1672A
Log Chopping
games
,
implementation
,
math
800
x15848
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3701
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x182
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1021
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x1982
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3017
1627B
Not Sitting
games
,
greedy
,
sortings
1300
x16287
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x834
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1406
1610I
Mashtali vs AtCoder
games
,
trees
3100
x259
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2839
1600E
Array Game
games
,
greedy
,
two pointers
1900
x1927
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x171
1584E
Game with Stones
binary search
,
data structures
,
games
,
greedy
2300
x1220
1537D
Deleting Divisors
games
,
math
,
number theory
1700
x11868
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x913
1527B2
Palindrome Game (hard version)
constructive algorithms
,
games
1900
x7556
1527B1
Palindrome Game (easy version)
constructive algorithms
,
games
1200
x24284
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x701
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x6843
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x851
1495B
Let's Go Hiking
games
,
greedy
1900
x5845
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x25434
1472D
Even-Odd Game
dp
,
games
,
greedy
,
sortings
1200
x26095
1458E
Nim Shortcuts
data structures
,
games
3100
x404
1455C
Ping-pong
constructive algorithms
,
games
,
math
1100
x19236
1451F
Nullify The Matrix
constructive algorithms
,
games
2700
x902
1451D
Circle Game
games
,
geometry
,
math
1700
x9265
1442F
Differentiating Games
games
,
interactive
3400
x129
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x214
1434E
A Convex Game
dsu
,
games
3500
x164
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x138
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x69
1425A
Arena of Greed
games
,
greedy
1400
x6354
1419A
Digit Game
games
,
greedy
,
implementation
900
x19266
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