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Before contest
Codeforces Round 973 (Div. 2)
13:10:13
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Difficulty:
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combine-tags-by-or
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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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Status
Standings
Custom test
Problems
#
Name
1340B
Nastya and Scoreboard
bitmasks
,
dp
,
graphs
,
greedy
1700
x7844
1340A
Nastya and Strange Generator
brute force
,
data structures
,
greedy
,
implementation
1500
x13409
1338A
Powered Addition
greedy
,
math
1500
x23868
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x11357
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x20320
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10833
1335D
Anti-Sudoku
constructive algorithms
,
implementation
1300
x27351
1334C
Circle of Monsters
brute force
,
constructive algorithms
,
greedy
,
math
1600
x16570
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12559
1332D
Walk on Matrix
bitmasks
,
constructive algorithms
,
math
1700
x8173
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x16540
1332B
Composite Coloring
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1400
x17562
1330B
Dreamoon Likes Permutations
implementation
,
math
1400
x14009
1329B
Dreamoon Likes Sequences
bitmasks
,
combinatorics
,
math
1700
x6680
1328B
K-th Beautiful String
binary search
,
brute force
,
combinatorics
,
implementation
,
math
1300
x29024
1327C
Game with Chips
constructive algorithms
,
implementation
1600
x13407
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x12068
1326C
Permutation Partitions
combinatorics
,
greedy
,
math
1300
x15618
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x12083
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x13616
1324E
Sleeping Schedule
dp
,
implementation
1700
x13485
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x28134
1323B
Count Subrectangles
binary search
,
greedy
,
implementation
1500
x8955
1322A
Unusual Competitions
greedy
1300
x12423
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9803
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x6039
1320A
Journey Planning
data structures
,
dp
,
greedy
,
math
,
sortings
1400
x16303
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x11256
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x9179
1313C1
Skyscrapers (easy version)
brute force
,
data structures
,
dp
,
greedy
1500
x10411
1313B
Different Rules
constructive algorithms
,
greedy
,
implementation
,
math
1700
x6670
1312D
Count the Arrays
combinatorics
,
math
1700
x9441
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x16502
1311C
Perform the Combo
brute force
1300
x15995
1310A
Recommendations
data structures
,
greedy
,
sortings
1700
x5169
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11803
1307B
Cow and Friend
geometry
,
greedy
,
math
1300
x13233
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x14513
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x16345
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x12135
1303B
National Project
math
1400
x15721
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9334
1301B
Motarack's Birthday
binary search
,
greedy
,
ternary search
1500
x14199
1299A
Anu Has a Function
brute force
,
greedy
,
math
1500
x12014
1296D
Fight with Monsters
greedy
,
sortings
1500
x14240
1296C
Yet Another Walking Robot
data structures
,
implementation
1500
x14797
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12902
1295B
Infinite Prefixes
math
,
strings
1700
x9303
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x11707
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x34545
1292B
Aroma's Search
brute force
,
constructive algorithms
,
geometry
,
greedy
,
implementation
1700
x6335
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x13318
1291B
Array Sharpening
greedy
,
implementation
1300
x14160
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8561
1288C
Two Arrays
combinatorics
,
dp
1600
x12845
1287B
Hyperset
brute force
,
data structures
,
implementation
1500
x9429
1285C
Fadi and LCM
brute force
,
math
,
number theory
1400
x23321
1285B
Just Eat It!
dp
,
greedy
,
implementation
1300
x22533
1284C
New Year and Permutation
combinatorics
,
math
1600
x7998
1284B
New Year and Ascent Sequence
binary search
,
combinatorics
,
data structures
,
dp
,
implementation
,
sortings
1400
x10814
1283C
Friends and Gifts
constructive algorithms
,
data structures
,
math
1500
x13111
1282B2
K for the Price of One (Hard Version)
dp
,
greedy
,
sortings
1600
x10169
1282B1
K for the Price of One (Easy Version)
dp
,
greedy
,
sortings
1400
x11465
1281B
Azamon Web Services
greedy
1600
x8280
1280A
Cut and Paste
implementation
,
math
1700
x5397
1279D
Santa's Bot
combinatorics
,
math
,
probabilities
1700
x6301
1279C
Stack of Presents
data structures
,
implementation
1400
x11683
1279B
Verse For Santa
binary search
,
brute force
,
implementation
1300
x13630
1278C
Berry Jam
data structures
,
dp
,
greedy
,
implementation
1700
x8020
1278B
A and B
greedy
,
math
1500
x13255
1276A
As Simple as One and Two
dp
,
greedy
1400
x12292
1272D
Remove One Element
brute force
,
dp
1500
x16527
1271C
Shawarma Tent
brute force
,
geometry
,
greedy
,
implementation
1300
x10528
1271B
Blocks
greedy
,
math
1300
x11329
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x14077
1269B
Modulo Equality
brute force
,
sortings
1500
x9137
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8617
1267E
Elections
greedy
1700
x3231
1266C
Diverse Matrix
constructive algorithms
,
greedy
,
math
,
number theory
1400
x9685
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12568
1264A
Beautiful Regional Contest
greedy
,
implementation
1500
x10051
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13924
1263C
Everyone is a Winner!
binary search
,
math
,
meet-in-the-middle
,
number theory
1400
x13687
1263B
PIN Codes
greedy
,
implementation
1400
x11355
1260C
Infinite Fence
greedy
,
math
,
number theory
1700
x8229
1260B
Obtain Two Zeroes
binary search
,
math
1300
x15696
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7529
1256D
Binary String Minimizing
greedy
1500
x12032
1256C
Platforms Jumping
greedy
1700
x6875
1256B
Minimize the Permutation
greedy
1400
x13071
1255C
League of Leesins
constructive algorithms
,
implementation
1600
x6699
1254A
Feeding Chicken
constructive algorithms
,
greedy
,
implementation
1700
x5171
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x9201
1253C
Sweets Eating
dp
,
greedy
,
math
,
sortings
1500
x14220
1253B
Silly Mistake
greedy
,
implementation
1400
x11175
1252C
Even Path
data structures
,
implementation
1600
x3718
1251C
Minimize The Integer
greedy
,
two pointers
1600
x12370
1251B
Binary Palindromes
greedy
,
strings
1400
x10970
1250L
Divide The Students
binary search
,
greedy
,
math
1500
x4095
1250H
Happy Birthday
math
1500
x4048
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