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Before contest
Educational Codeforces Round 169 (Rated for Div. 2)
12:17:19
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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
1323B
Count Subrectangles
binary search
,
greedy
,
implementation
1500
x8871
1322A
Unusual Competitions
greedy
1300
x12407
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9777
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x5989
1320A
Journey Planning
data structures
,
dp
,
greedy
,
math
,
sortings
1400
x16099
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x11222
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x9161
1313C1
Skyscrapers (easy version)
brute force
,
data structures
,
dp
,
greedy
1500
x10363
1313B
Different Rules
constructive algorithms
,
greedy
,
implementation
,
math
1700
x6655
1312D
Count the Arrays
combinatorics
,
math
1700
x9361
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x16315
1311C
Perform the Combo
brute force
1300
x15933
1310A
Recommendations
data structures
,
greedy
,
sortings
1700
x5154
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11767
1307B
Cow and Friend
geometry
,
greedy
,
math
1300
x13191
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x14340
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x16252
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x12104
1303B
National Project
math
1400
x15655
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9298
1301B
Motarack's Birthday
binary search
,
greedy
,
ternary search
1500
x14140
1299A
Anu Has a Function
brute force
,
greedy
,
math
1500
x11969
1296D
Fight with Monsters
greedy
,
sortings
1500
x14185
1296C
Yet Another Walking Robot
data structures
,
implementation
1500
x14746
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12849
1295B
Infinite Prefixes
math
,
strings
1700
x9281
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x11669
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x34032
1292B
Aroma's Search
brute force
,
constructive algorithms
,
geometry
,
greedy
,
implementation
1700
x6300
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x13257
1291B
Array Sharpening
greedy
,
implementation
1300
x14111
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8541
1288C
Two Arrays
combinatorics
,
dp
1600
x12730
1287B
Hyperset
brute force
,
data structures
,
implementation
1500
x9406
1285C
Fadi and LCM
brute force
,
math
,
number theory
1400
x22995
1285B
Just Eat It!
dp
,
greedy
,
implementation
1300
x22200
1284C
New Year and Permutation
combinatorics
,
math
1600
x7969
1284B
New Year and Ascent Sequence
binary search
,
combinatorics
,
data structures
,
dp
,
implementation
,
sortings
1400
x10799
1283C
Friends and Gifts
constructive algorithms
,
data structures
,
math
1500
x13076
1282B2
K for the Price of One (Hard Version)
dp
,
greedy
,
sortings
1600
x10123
1282B1
K for the Price of One (Easy Version)
dp
,
greedy
,
sortings
1400
x11425
1281B
Azamon Web Services
greedy
1600
x8256
1280A
Cut and Paste
implementation
,
math
1700
x5361
1279D
Santa's Bot
combinatorics
,
math
,
probabilities
1700
x6205
1279C
Stack of Presents
data structures
,
implementation
1400
x11642
1279B
Verse For Santa
binary search
,
brute force
,
implementation
1300
x13570
1278C
Berry Jam
data structures
,
dp
,
greedy
,
implementation
1700
x7937
1278B
A and B
greedy
,
math
1500
x13196
1276A
As Simple as One and Two
dp
,
greedy
1400
x12265
1272D
Remove One Element
brute force
,
dp
1500
x16380
1271C
Shawarma Tent
brute force
,
geometry
,
greedy
,
implementation
1300
x10465
1271B
Blocks
greedy
,
math
1300
x11303
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x13990
1269B
Modulo Equality
brute force
,
sortings
1500
x9116
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8522
1267E
Elections
greedy
1700
x3158
1266C
Diverse Matrix
constructive algorithms
,
greedy
,
math
,
number theory
1400
x9656
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12537
1264A
Beautiful Regional Contest
greedy
,
implementation
1500
x10034
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13795
1263C
Everyone is a Winner!
binary search
,
math
,
meet-in-the-middle
,
number theory
1400
x13609
1263B
PIN Codes
greedy
,
implementation
1400
x11321
1260C
Infinite Fence
greedy
,
math
,
number theory
1700
x8206
1260B
Obtain Two Zeroes
binary search
,
math
1300
x15642
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7504
1256D
Binary String Minimizing
greedy
1500
x11978
1256C
Platforms Jumping
greedy
1700
x6851
1256B
Minimize the Permutation
greedy
1400
x13032
1255C
League of Leesins
constructive algorithms
,
implementation
1600
x6684
1254A
Feeding Chicken
constructive algorithms
,
greedy
,
implementation
1700
x5158
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x9128
1253C
Sweets Eating
dp
,
greedy
,
math
,
sortings
1500
x14156
1253B
Silly Mistake
greedy
,
implementation
1400
x11146
1252C
Even Path
data structures
,
implementation
1600
x3658
1251C
Minimize The Integer
greedy
,
two pointers
1600
x12201
1251B
Binary Palindromes
greedy
,
strings
1400
x10940
1250L
Divide The Students
binary search
,
greedy
,
math
1500
x4073
1250H
Happy Birthday
math
1500
x4021
1250A
Berstagram
implementation
1400
x4061
1249E
By Elevator or Stairs?
dp
,
shortest paths
1700
x9570
1249C2
Good Numbers (hard version)
binary search
,
greedy
,
math
,
meet-in-the-middle
1500
x12531
1249C1
Good Numbers (easy version)
brute force
,
greedy
,
implementation
1300
x15429
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16641
1245C
Constanze's Machine
dp
1400
x17343
1243B2
Character Swap (Hard Version)
strings
1600
x7066
1242A
Tile Painting
constructive algorithms
,
math
,
number theory
1500
x12531
1239A
Ivan the Fool and the Probability Theory
combinatorics
,
dp
,
math
1700
x7314
1238C
Standard Free2play
dp
,
greedy
,
math
1600
x7358
1238B
Kill `Em All
greedy
,
sortings
1300
x13480
1237C1
Balanced Removals (Easier)
constructive algorithms
,
geometry
,
greedy
1700
x6054
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x15595
1236C
Labs
constructive algorithms
,
greedy
,
implementation
1300
x10080
1236B
Alice and the List of Presents
combinatorics
,
math
1500
x10982
1234D
Distinct Characters Queries
data structures
1600
x14747
1234C
Pipes
dp
,
implementation
1500
x12491
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16808
1228C
Primes and Multiplication
math
,
number theory
1700
x8971
1228B
Filling the Grid
implementation
,
math
1400
x11493
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6370
1227C
Messy
constructive algorithms
1700
x5494
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