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Codeforces Round 987 (Div. 2)
07:05:52
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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
1097B
Petr and a Combination Lock
bitmasks
,
brute force
,
dp
1200
x29160
1097A
Gennady and a Card Game
brute force
,
implementation
800
x39112
1096A
Find Divisible
greedy
,
implementation
,
math
800
x18804
1095B
Array Stabilization
implementation
900
x22192
1095A
Repeating Cipher
implementation
800
x31910
1093B
Letters Rearranging
constructive algorithms
,
greedy
,
sortings
,
strings
900
x16592
1093A
Dice Rolling
math
800
x17742
1092B
Teams Forming
sortings
800
x26590
1092A
Uniform String
implementation
800
x16326
1091B
New Year and the Treasure Geolocation
brute force
,
constructive algorithms
,
greedy
,
implementation
1200
x10689
1091A
New Year and the Christmas Ornament
brute force
,
implementation
,
math
800
x17645
1090M
The Pleasant Walk
implementation
1000
x6359
1089L
Lazyland
900
x4021
1088B
Ehab and subtraction
implementation
,
sortings
1000
x12639
1088A
Ehab and another construction problem
brute force
,
constructive algorithms
800
x16892
1085B
Div Times Mod
math
1100
x9343
1085A
Right-Left Cipher
implementation
,
strings
800
x12197
1084B
Kvass and the Fair Nut
greedy
,
implementation
1200
x7826
1084A
The Fair Nut and Elevator
brute force
,
implementation
1000
x7938
1082A
Vasya and Book
implementation
,
math
1200
x8617
1081A
Definite Game
constructive algorithms
,
math
800
x12110
1080B
Margarite and the best present
math
900
x11840
1080A
Petya and Origami
math
800
x18220
1077B
Disturbed People
greedy
1000
x19080
1077A
Frog Jumping
math
800
x30117
1076B
Divisor Subtraction
implementation
,
math
,
number theory
1200
x13093
1076A
Minimizing the String
greedy
,
strings
1200
x13153
1075B
Taxi drivers and Lyft
implementation
,
sortings
1200
x4256
1075A
The King's Race
implementation
,
math
800
x8564
1073B
Vasya and Books
implementation
,
math
1000
x10599
1073A
Diverse Substring
implementation
,
strings
1000
x15596
1070K
Video Posts
implementation
1100
x4955
1068B
LCM
math
,
number theory
1200
x11680
1066A
Vova and Train
math
1100
x14601
1065A
Vasya and Chocolate
implementation
,
math
800
x14688
1064B
Equations of Mathematical Magic
math
1200
x7557
1064A
Make a triangle!
brute force
,
geometry
,
math
800
x22616
1061A
Coins
greedy
,
implementation
,
math
800
x22069
1060B
Maximum Sum of Digits
greedy
1100
x8981
1060A
Phone Numbers
brute force
800
x14249
1059A
Cashier
implementation
1000
x12889
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x6172
1056A
Determine Line
implementation
800
x6673
1055A
Metro
graphs
900
x10769
1054B
Appending Mex
implementation
1000
x6608
1054A
Elevator or Stairs?
implementation
800
x9101
1051B
Relatively Prime Pairs
greedy
,
math
,
number theory
1000
x17225
1051A
Vasya And Password
greedy
,
implementation
,
strings
1200
x8426
1047B
Cover Points
geometry
,
math
900
x17301
1047A
Little C Loves 3 I
math
800
x19992
1043B
Lost Array
implementation
1200
x6293
1043A
Elections
implementation
,
math
800
x10819
1042B
Vitamins
bitmasks
,
brute force
,
dp
,
implementation
1200
x16247
1042A
Benches
binary search
,
implementation
1100
x12967
1041B
Buying a TV Set
math
1000
x14061
1041A
Heist
greedy
,
implementation
,
sortings
800
x25221
1040A
Palindrome Dance
greedy
1000
x9582
1038B
Non-Coprime Partition
constructive algorithms
,
math
1100
x13641
1038A
Equality
implementation
,
strings
800
x14962
1036A
Function Height
math
1000
x10177
1033B
Square Difference
math
,
number theory
1100
x9893
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x13792
1032B
Personalized Cup
1200
x5002
1032A
Kitchen Utensils
900
x6872
1031A
Golden Plate
implementation
,
math
800
x12912
1030B
Vasya and Cornfield
geometry
1100
x12389
1030A
In Search of an Easy Problem
implementation
800
x134099
1029B
Creating the Contest
dp
,
greedy
,
math
1200
x17034
1028B
Unnatural Conditions
constructive algorithms
,
math
1200
x9113
1028A
Find Square
implementation
800
x10904
1027B
Numbers on the Chessboard
implementation
,
math
1200
x8392
1027A
Palindromic Twist
implementation
,
strings
1000
x16408
1025A
Doggo Recoloring
implementation
,
sortings
900
x15208
1023C
Bracket Subsequence
greedy
1200
x9981
1023B
Pair of Toys
math
1000
x10867
1023A
Single Wildcard Pattern Matching
brute force
,
implementation
,
strings
1200
x8711
1020B
Badge
brute force
,
dfs and similar
,
graphs
1000
x21448
1020A
New Building for SIS
math
1000
x9008
1017B
The Bits
implementation
,
math
1200
x9156
1017A
The Rank
implementation
800
x20559
1016A
Death Note
greedy
,
implementation
,
math
900
x14943
1015C
Songs Compression
sortings
1100
x18113
1015B
Obtaining the String
implementation
1200
x11623
1015A
Points in Segments
implementation
800
x21054
1013B
And
greedy
1200
x7681
1013A
Piles With Stones
math
800
x10980
1011B
Planning The Expedition
binary search
,
brute force
,
implementation
1200
x10175
1011A
Stages
greedy
,
implementation
,
sortings
900
x12262
1009A
Game Shopping
implementation
800
x11824
1008B
Turn the Rectangles
greedy
,
sortings
1000
x11463
1008A
Romaji
implementation
,
strings
900
x15130
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x21416
1006B
Polycarp's Practice
greedy
,
implementation
,
sortings
1200
x13339
1006A
Adjacent Replacements
implementation
800
x21669
1005B
Delete from the Left
brute force
,
implementation
,
strings
900
x23648
1005A
Tanya and Stairways
implementation
800
x23864
1004A
Sonya and Hotels
implementation
900
x11243
1003A
Polycarp's Pockets
implementation
800
x27287
1002D1
Oracle for f(x) = b * x mod 2
1200
x404
1002A1
Generate superposition of all basis states
800
x845
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