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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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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
1271A
Suits
brute force
,
greedy
,
math
800
x14672
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x225
1270H
Number of Components
data structures
3300
x554
1270G
Subset with Zero Sum
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x2026
1270F
Awesome Substrings
math
,
strings
2600
x1086
1270E
Divide Points
constructive algorithms
,
geometry
,
math
2300
x2194
1270D
Strange Device
constructive algorithms
,
interactive
,
math
,
sortings
1900
x4358
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x13551
1270B
Interesting Subarray
constructive algorithms
,
greedy
,
math
1200
x15934
1270A
Card Game
games
,
greedy
,
math
800
x16599
1269B
Modulo Equality
brute force
,
sortings
1500
x8881
1269A
Equation
brute force
,
math
800
x20804
1268E
Happy Cactus
dp
3400
x217
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x479
1268C
K Integers
binary search
,
data structures
2300
x1659
1268B
Domino for Young
dp
,
greedy
,
math
2000
x5602
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8273
1267L
Lexicography
constructive algorithms
,
strings
1800
x2845
1267K
Key Storage
combinatorics
,
math
2100
x1736
1267J
Just Arrange the Icons
greedy
,
implementation
,
math
1800
x2553
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x725
1267H
Help BerLine
constructive algorithms
3200
x100
1267G
Game Relics
math
,
probabilities
3000
x619
1267F
Foolprüf Security
graphs
2600
x489
1267E
Elections
greedy
1700
x2984
1267D
DevOps Best Practices
constructive algorithms
2800
x205
1267C
Cactus Revenge
constructive algorithms
3500
x377
1267B
Balls of Buma
900
x3786
1267A
Apprentice Learning Trajectory
2400
x811
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x98
1266G
Permutation Concatenation
string suffix structures
3300
x116
1266F
Almost Same Distance
dfs and similar
,
graphs
2900
x329
1266E
Spaceship Solitaire
data structures
,
greedy
,
implementation
2100
x2067
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3404
1266C
Diverse Matrix
constructive algorithms
,
greedy
,
math
,
number theory
1400
x9342
1266B
Dice Tower
constructive algorithms
,
math
1000
x14289
1266A
Competitive Programmer
chinese remainder theorem
,
math
1000
x14937
1265E
Beautiful Mirrors
data structures
,
dp
,
math
,
probabilities
2100
x3317
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12281
1265A
Beautiful String
constructive algorithms
,
greedy
1000
x14746
1264F
Beautiful Fibonacci Problem
constructive algorithms
,
number theory
3500
x824
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x739
1264D2
Beautiful Bracket Sequence (hard version)
combinatorics
,
probabilities
2900
x837
1264D1
Beautiful Bracket Sequence (easy version)
combinatorics
,
dp
,
probabilities
2600
x1165
1264C
Beautiful Mirrors with queries
data structures
,
probabilities
2400
x1118
1264B
Beautiful Sequence
brute force
,
constructive algorithms
,
greedy
1900
x5574
1264A
Beautiful Regional Contest
greedy
,
implementation
1500
x9823
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x831
1263E
Editor
data structures
,
implementation
2100
x2546
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13184
1263C
Everyone is a Winner!
binary search
,
math
,
meet-in-the-middle
,
number theory
1400
x13276
1263B
PIN Codes
greedy
,
implementation
1400
x11102
1263A
Sweet Problem
math
1100
x15878
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x369
1260F
Colored Tree
data structures
,
trees
2700
x476
1260E
Tournament
brute force
,
dp
,
greedy
2400
x1599
1260D
A Game with Traps
binary search
,
dp
,
greedy
,
sortings
1900
x3579
1260C
Infinite Fence
greedy
,
math
,
number theory
1700
x7858
1260B
Obtain Two Zeroes
binary search
,
math
1300
x15061
1260A
Heating
math
1000
x14133
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x567
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1923
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4109
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7188
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15527
1257B
Magic Stick
math
1000
x19605
1257A
Two Rival Students
greedy
,
math
800
x20003
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3045
1256E
Yet Another Division Into Teams
dp
,
greedy
,
sortings
2000
x3866
1256D
Binary String Minimizing
greedy
1500
x11690
1256C
Platforms Jumping
greedy
1700
x6633
1256B
Minimize the Permutation
greedy
1400
x12755
1256A
Payment Without Change
math
1000
x28230
1255C
League of Leesins
constructive algorithms
,
implementation
1600
x6443
1255B
Fridge Lockers
graphs
,
implementation
1100
x11655
1255A
Changing Volume
math
800
x16875
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x258
1254D
Tree Queries
data structures
,
probabilities
,
trees
2700
x1119
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x1259
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2925
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4403
1254A
Feeding Chicken
constructive algorithms
,
greedy
,
implementation
1700
x4980
1253F
Cheap Robot
binary search
,
dsu
,
graphs
,
shortest paths
,
trees
2500
x1573
1253E
Antenna Coverage
data structures
,
dp
,
greedy
,
sortings
2200
x2615
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x8810
1253C
Sweets Eating
dp
,
greedy
,
math
,
sortings
1500
x13769
1253B
Silly Mistake
greedy
,
implementation
1400
x10895
1253A
Single Push
implementation
1000
x17625
1252L
Road Construction
flows
,
graphs
2300
x565
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1778
1252J
Tiling Terrace
brute force
,
dp
2300
x680
1252I
Mission Possible
3000
x29
1252H
Twin Buildings
greedy
,
implementation
1800
x2585
1252G
Performance Review
data structures
2100
x1359
1252F
Regular Forestation
hashing
,
trees
2400
x865
1252E
Songwriter
greedy
,
two pointers
2200
x1208
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x324
1252C
Even Path
data structures
,
implementation
1600
x3619
1252B
Cleaning Robots
dp
,
trees
2300
x501
1252A
Copying Homework
1000
x5560
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