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Before contest
Codeforces Round 878 (Div. 3)
00:28:42
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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
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x918
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x442
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x508
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x208
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x463
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x483
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x376
1772E
Permutation Game
games
1700
x5166
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3220
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x11324
1747C
Swap Game
games
1200
x16973
1740C
Bricks and Bags
constructive algorithms
,
games
,
greedy
,
sortings
1400
x9090
1739C
Card Game
combinatorics
,
constructive algorithms
,
dp
,
games
1500
x7653
1738C
Even Number Addicts
dp
,
games
,
greedy
,
math
1500
x8968
1737C
Ela and Crickets
constructive algorithms
,
games
,
implementation
,
math
1500
x4965
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x5864
1719A
Chip Game
games
,
math
800
x23574
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x390
1704F
Colouring Game
constructive algorithms
,
dp
,
games
2600
x726
1695B
Circle Game
games
,
greedy
1000
x16779
1695A
Subrectangle Guess
games
800
x15542
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x22184
1681A
Game with Cards
games
,
greedy
800
x19971
1673A
Subtle Substring Subtraction
games
,
greedy
,
strings
800
x17549
1672A
Log Chopping
games
,
implementation
,
math
800
x15185
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3219
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x152
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x871
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x1613
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x2517
1627B
Not Sitting
games
,
greedy
,
sortings
1300
x15193
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x716
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1240
1610I
Mashtali vs AtCoder
games
,
trees
3100
x226
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2561
1600E
Array Game
games
,
greedy
,
two pointers
1900
x1698
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x115
1584E
Game with Stones
binary search
,
data structures
,
games
,
greedy
2300
x1126
1537D
Deleting Divisors
games
,
math
,
number theory
1700
x10820
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x835
1527B2
Palindrome Game (hard version)
constructive algorithms
,
games
1900
x6892
1527B1
Palindrome Game (easy version)
constructive algorithms
,
games
1200
x21394
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x545
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x6488
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x664
1495B
Let's Go Hiking
games
,
greedy
1900
x5513
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x24416
1472D
Even-Odd Game
dp
,
games
,
greedy
,
sortings
1200
x23141
1458E
Nim Shortcuts
data structures
,
games
3100
x315
1455C
Ping-pong
constructive algorithms
,
games
,
math
1100
x18386
1451F
Nullify The Matrix
constructive algorithms
,
games
2700
x798
1451D
Circle Game
games
,
geometry
,
math
1700
x8747
1442F
Differentiating Games
games
,
interactive
3400
x108
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x168
1434E
A Convex Game
dsu
,
games
3500
x124
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x121
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x59
1425A
Arena of Greed
games
,
greedy
1400
x5723
1419A
Digit Game
games
,
greedy
,
implementation
900
x18445
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x507
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x6579
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x182
1398B
Substring Removal Game
games
,
greedy
,
sortings
800
x23101
1396B
Stoned Game
brute force
,
constructive algorithms
,
games
,
greedy
1800
x9892
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x4493
1382B
Sequential Nim
dp
,
games
1100
x22664
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x1757
1373B
01 Game
games
900
x28589
1372D
Omkar and Circle
brute force
,
dp
,
games
,
greedy
2100
x5041
1370C
Number Game
games
,
math
,
number theory
1400
x21460
1369F
BareLee
dfs and similar
,
dp
,
games
2700
x536
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x785
1365A
Matrix Game
games
,
greedy
,
implementation
1100
x22518
1363C
Game On Leaves
games
,
trees
1600
x16140
1346H
Game with Segments
*special problem
,
data structures
,
games
2700
x36
1333D
Challenges in school №41
brute force
,
constructive algorithms
,
games
,
graphs
,
greedy
,
implementation
,
sortings
2100
x3513
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x605
1270A
Card Game
games
,
greedy
,
math
800
x16080
1221E
Game With String
games
2500
x958
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x9493
1215D
Ticket Game
games
,
greedy
,
math
1700
x5743
1197F
Coloring Game
dp
,
games
,
matrices
2700
x204
1194D
1-2-K Game
games
,
math
1700
x5829
1190C
Tokitsukaze and Duel
brute force
,
games
,
greedy
2300
x1626
1190B
Tokitsukaze, CSL and Stone Game
games
1800
x5862
1155B
Game with Telephone Numbers
games
,
greedy
,
implementation
1200
x10800
1149E
Election Promises
games
,
graphs
3200
x382
1147F
Zigzag Game
games
,
interactive
3500
x202
1147C
Thanos Nim
games
2000
x2660
1110G
Tree-Tac-Toe
constructive algorithms
,
games
,
trees
3100
x481
1102C
Doors Breaking and Repairing
games
1200
x12104
1100D
Dasha and Chess
constructive algorithms
,
games
,
interactive
2500
x802
1099F
Cookies
binary search
,
data structures
,
dfs and similar
,
dp
,
games
,
trees
2400
x792
1091H
New Year and the Tricolore Recreation
games
3200
x316
1090G
Combostone
games
,
implementation
2500
x93
1076G
Array Game
data structures
,
games
3000
x358
1037G
A Game on Strings
games
3200
x275
1033G
Chip Game
games
3500
x291
1033C
Permutation Game
brute force
,
dp
,
games
1600
x5026
980C
Posterized
games
,
greedy
1700
x3638
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