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Codeforces Round 974 (Div. 3)
20:53:11
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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
1282E
The Cake Is a Lie
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
2400
x1142
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2229
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4302
1282B2
K for the Price of One (Hard Version)
dp
,
greedy
,
sortings
1600
x10172
1282B1
K for the Price of One (Easy Version)
dp
,
greedy
,
sortings
1400
x11466
1282A
Temporarily unavailable
implementation
,
math
900
x14766
1281B
Azamon Web Services
greedy
1600
x8281
1281A
Suffix Three
implementation
800
x17933
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x61
1280E
Kirchhoff's Current Loss
math
2900
x200
1280D
Miss Punyverse
dp
,
greedy
,
trees
2500
x1007
1280C
Jeremy Bearimy
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2675
1280B
Beingawesomeism
implementation
,
math
1800
x3929
1280A
Cut and Paste
implementation
,
math
1700
x5400
1279F
New Year and Handle Change
binary search
,
dp
2800
x885
1279E
New Year Permutations
combinatorics
,
dp
2700
x373
1279D
Santa's Bot
combinatorics
,
math
,
probabilities
1700
x6304
1279C
Stack of Presents
data structures
,
implementation
1400
x11683
1279B
Verse For Santa
binary search
,
brute force
,
implementation
1300
x13631
1279A
New Year Garland
math
900
x16901
1278F
Cards
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2600
x1869
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1915
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3971
1278C
Berry Jam
data structures
,
dp
,
greedy
,
implementation
1700
x8021
1278B
A and B
greedy
,
math
1500
x13259
1278A
Shuffle Hashing
brute force
,
implementation
,
strings
1000
x16614
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x3117
1277B
Make Them Odd
greedy
,
number theory
1200
x15155
1277A
Happy Birthday, Polycarp!
implementation
1000
x13304
1276F
Asterisk Substrings
string suffix structures
3400
x341
1276E
Four Stones
constructive algorithms
3500
x87
1276D
Tree Elimination
dp
,
trees
2900
x539
1276C
Beautiful Rectangle
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
greedy
,
math
2300
x1656
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4944
1276A
As Simple as One and Two
dp
,
greedy
1400
x12293
1275F
Шардирование постов
*special problem
,
binary search
,
interactive
x92
1275E3
Контрольная сумма
*special problem
x56
1275E2
Контрольная сумма
*special problem
x130
1275E1
Контрольная сумма
*special problem
x254
1275D
Storage2
*special problem
x421
1275C
#define Задача B ...
*special problem
x669
1275B
Code Review
*special problem
x821
1275A
Скрытый друг
*special problem
x887
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1945
1272E
Nearest Opposite Parity
dfs and similar
,
graphs
,
shortest paths
1900
x6295
1272D
Remove One Element
brute force
,
dp
1500
x16528
1272C
Yet Another Broken Keyboard
combinatorics
,
dp
,
implementation
1200
x26430
1272B
Snow Walking Robot
constructive algorithms
,
greedy
,
implementation
1200
x13883
1272A
Three Friends
brute force
,
greedy
,
math
,
sortings
900
x20668
1271F
Divide The Students
brute force
2700
x192
1271E
Common Number
binary search
,
combinatorics
,
dp
,
math
2100
x3382
1271D
Portals
data structures
,
dp
,
greedy
,
implementation
,
sortings
2100
x3036
1271C
Shawarma Tent
brute force
,
geometry
,
greedy
,
implementation
1300
x10532
1271B
Blocks
greedy
,
math
1300
x11331
1271A
Suits
brute force
,
greedy
,
math
800
x14942
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x238
1270H
Number of Components
data structures
3300
x719
1270G
Subset with Zero Sum
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x2225
1270F
Awesome Substrings
math
,
strings
2600
x1134
1270E
Divide Points
constructive algorithms
,
geometry
,
math
2300
x2372
1270D
Strange Device
constructive algorithms
,
interactive
,
math
,
sortings
1900
x4673
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x14078
1270B
Interesting Subarray
constructive algorithms
,
greedy
,
math
1200
x16353
1270A
Card Game
games
,
greedy
,
math
800
x16948
1269B
Modulo Equality
brute force
,
sortings
1500
x9139
1269A
Equation
brute force
,
math
800
x21554
1268E
Happy Cactus
dp
3400
x245
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x505
1268C
K Integers
binary search
,
data structures
2300
x1713
1268B
Domino for Young
dp
,
greedy
,
math
2000
x5908
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8618
1267L
Lexicography
constructive algorithms
,
strings
1800
x3037
1267K
Key Storage
combinatorics
,
math
2100
x1908
1267J
Just Arrange the Icons
greedy
,
implementation
,
math
1800
x2809
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x884
1267H
Help BerLine
constructive algorithms
3200
x150
1267G
Game Relics
math
,
probabilities
3000
x653
1267F
Foolprüf Security
graphs
2600
x658
1267E
Elections
greedy
1700
x3233
1267D
DevOps Best Practices
constructive algorithms
2800
x214
1267C
Cactus Revenge
constructive algorithms
3500
x383
1267B
Balls of Buma
900
x3989
1267A
Apprentice Learning Trajectory
2400
x985
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x104
1266G
Permutation Concatenation
string suffix structures
3300
x119
1266F
Almost Same Distance
dfs and similar
,
graphs
2900
x340
1266E
Spaceship Solitaire
data structures
,
greedy
,
implementation
2100
x2230
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3624
1266C
Diverse Matrix
constructive algorithms
,
greedy
,
math
,
number theory
1400
x9686
1266B
Dice Tower
constructive algorithms
,
math
1000
x14984
1266A
Competitive Programmer
chinese remainder theorem
,
math
1000
x15752
1265E
Beautiful Mirrors
data structures
,
dp
,
math
,
probabilities
2100
x3646
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12569
1265A
Beautiful String
constructive algorithms
,
greedy
1000
x15080
1264F
Beautiful Fibonacci Problem
constructive algorithms
,
number theory
3500
x928
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x806
1264D2
Beautiful Bracket Sequence (hard version)
combinatorics
,
probabilities
2900
x963
1264D1
Beautiful Bracket Sequence (easy version)
combinatorics
,
dp
,
probabilities
2600
x1270
1264C
Beautiful Mirrors with queries
data structures
,
probabilities
2400
x1148
1264B
Beautiful Sequence
brute force
,
constructive algorithms
,
greedy
1900
x5796
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