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Codeforces Round 974 (Div. 3)
04:03:51
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*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
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x823
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1732
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5409
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8562
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x512
1288E
Messenger Simulator
data structures
2000
x3567
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x7152
1288C
Two Arrays
combinatorics
,
dp
1600
x12848
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x244
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x514
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x582
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x636
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1424
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4689
1286A
Garland
dp
,
greedy
,
sortings
1800
x8788
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x1131
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1828
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7701
1284G
Seollal
graphs
3300
x173
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x317
1284E
New Year and Castle Construction
combinatorics
,
geometry
,
math
,
sortings
2500
x1299
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x3156
1284C
New Year and Permutation
combinatorics
,
math
1600
x8002
1283F
DIY Garland
constructive algorithms
,
greedy
,
trees
2200
x1847
1283E
New Year Parties
dp
,
greedy
1800
x6536
1283D
Christmas Trees
graphs
,
greedy
,
shortest paths
1800
x7772
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
1281B
Azamon Web Services
greedy
1600
x8281
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
x5401
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
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
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x3117
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
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1945
1272E
Nearest Opposite Parity
dfs and similar
,
graphs
,
shortest paths
1900
x6295
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
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
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
x5909
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8619
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
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
1265E
Beautiful Mirrors
data structures
,
dp
,
math
,
probabilities
2100
x3646
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
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x872
1263E
Editor
data structures
,
implementation
2100
x2785
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x386
1260F
Colored Tree
data structures
,
trees
2700
x538
1260E
Tournament
brute force
,
dp
,
greedy
2400
x1714
1260D
A Game with Traps
binary search
,
dp
,
greedy
,
sortings
1900
x3838
1260C
Infinite Fence
greedy
,
math
,
number theory
1700
x8231
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x607
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x2009
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4215
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7532
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