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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
14:19:38
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Difficulty:
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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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Custom test
Problems
#
Name
954G
Castle Defense
binary search
,
data structures
,
greedy
,
two pointers
2000
x2176
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x1229
954E
Water Taps
binary search
,
greedy
,
sortings
2000
x1930
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6755
954C
Matrix Walk
implementation
1700
x3798
954B
String Typing
implementation
,
strings
1400
x7300
954A
Diagonal Walking
implementation
800
x10571
952G
Puzzling Language
constructive algorithms
2200
x238
952F
2 + 2 != 4
2400
x397
952E
Cheese Board
2000
x642
952D
I'm Feeling Lucky!
probabilities
1800
x2457
952C
Ravioli Sort
implementation
1600
x2918
952B
A Map of the Cat
brute force
,
interactive
1900
x2063
952A
Quirky Quantifiers
math
800
x11370
950B
Intercepted Message
greedy
,
implementation
1100
x7607
950A
Left-handers, Right-handers and Ambidexters
implementation
,
math
800
x15458
949F
Astronomy
geometry
,
probabilities
3300
x59
949E
Binary Cards
brute force
2700
x649
949D
Curfew
binary search
,
brute force
,
greedy
,
sortings
2300
x833
949C
Data Center Maintenance
dfs and similar
,
graphs
1900
x2089
949B
A Leapfrog in the Array
constructive algorithms
,
math
1700
x3739
949A
Zebras
greedy
1600
x5419
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13994
946G
Almost Increasing Array
data structures
,
dp
2500
x702
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x575
946E
Largest Beautiful Number
greedy
,
implementation
2200
x1113
946D
Timetable
dp
1800
x4483
946C
String Transformation
greedy
,
strings
1300
x8921
946B
Weird Subtraction Process
math
,
number theory
1100
x10934
946A
Partition
greedy
800
x16747
940F
Machine Learning
brute force
,
data structures
2600
x2695
940E
Cashback
data structures
,
dp
,
greedy
,
math
2000
x3814
940D
Alena And The Heater
binary search
,
implementation
1600
x3653
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5931
940B
Our Tanya is Crying Out Loud
dp
,
greedy
1400
x9059
940A
Points on the line
brute force
,
greedy
,
sortings
1200
x8365
939F
Cutlet
data structures
,
dp
2400
x988
939E
Maximize!
binary search
,
greedy
,
ternary search
,
two pointers
1800
x3174
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7395
939C
Convenient For Everybody
binary search
,
two pointers
1600
x4647
939B
Hamster Farm
implementation
1000
x10657
939A
Love Triangle
graphs
800
x25795
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x925
938F
Erasing Substrings
bitmasks
,
dp
,
greedy
2700
x513
938E
Max History
combinatorics
,
math
2300
x1345
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5814
938C
Constructing Tests
binary search
,
brute force
,
constructive algorithms
1700
x3330
938B
Run For Your Prize
brute force
,
greedy
1100
x8902
938A
Word Correction
implementation
800
x11531
937B
Vile Grasshoppers
brute force
,
math
,
number theory
1400
x6938
937A
Olympiad
implementation
,
sortings
800
x15298
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x202
936D
World of Tank
dp
,
greedy
3000
x332
936C
Lock Puzzle
constructive algorithms
,
implementation
,
strings
2300
x1186
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x3277
936A
Save Energy!
binary search
,
implementation
,
math
1700
x4374
935F
Fafa and Array
data structures
,
greedy
2600
x374
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2300
x901
935D
Fafa and Ancient Alphabet
math
,
probabilities
1900
x2647
935C
Fifa and Fafa
geometry
1600
x4773
935B
Fafa and the Gates
implementation
900
x11675
935A
Fafa and his Company
brute force
,
implementation
800
x43678
934B
A Prosperous Lot
constructive algorithms
,
implementation
1200
x8737
934A
A Compatible Pair
brute force
,
games
1400
x7033
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x228
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x333
933C
A Colourful Prospect
geometry
,
graphs
2700
x587
933B
A Determined Cleanup
math
2000
x1951
933A
A Twisty Movement
dp
1800
x5016
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x960
932F
Escape Through Leaf
data structures
,
dp
,
geometry
2700
x3008
932E
Team Work
combinatorics
,
dp
,
math
2400
x2909
932D
Tree
binary search
,
dp
,
trees
2200
x1760
932C
Permutation Cycle
brute force
,
constructive algorithms
1600
x4051
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x8239
932A
Palindromic Supersequence
constructive algorithms
800
x10332
931C
Laboratory Work
implementation
,
math
1700
x3367
931B
World Cup
constructive algorithms
,
implementation
1200
x7173
931A
Friends Meeting
brute force
,
greedy
,
implementation
,
math
800
x12271
930E
Coins Exhibition
data structures
,
dp
,
math
2900
x438
930D
Game with Tokens
data structures
,
games
,
implementation
2500
x415
930C
Teodor is not a liar!
data structures
,
dp
1900
x2155
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2697
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x7262
929D
Пограничные врата
2400
x152
929C
Красивая команда
*special problem
,
combinatorics
,
math
1700
x1162
929B
Места в самолёте
*special problem
,
implementation
1300
x2048
929A
Прокат велосипедов
*special problem
,
greedy
,
implementation
1400
x2507
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x815
928C
Dependency management
*special problem
,
graphs
,
implementation
1900
x890
928B
Chat
*special problem
,
dp
1400
x2549
928A
Login Verification
*special problem
,
strings
1200
x3413
927A
BuberPool Taxi Optimization
*special problem
,
interactive
2900
x1
926J
Segments
data structures
2100
x396
926I
A Vital Problem
1700
x668
926H
Endless Roses Most Beautiful
2200
x219
926G
Large Bouquets
1500
x1485
926F
Mobile Communications
2000
x239
926E
Merge Equal Elements
constructive algorithms
,
data structures
1900
x934
926D
Choose Place
1600
x936
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