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Educational Codeforces Round 169 (Rated for Div. 2)
12:12:22
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Difficulty:
—
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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Problems
#
Name
1408B
Arrays Sum
constructive algorithms
,
greedy
,
math
1400
x9899
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11860
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x16920
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x10155
1404A
Balanced Bitstring
implementation
,
strings
1500
x15204
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x24055
1400C
Binary String Reconstruction
2-sat
,
brute force
,
constructive algorithms
,
greedy
1500
x17179
1400B
RPG Protagonist
brute force
,
greedy
,
math
1700
x11136
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x18132
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x25695
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14627
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x15318
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x13997
1393C
Pinkie Pie Eats Patty-cakes
constructive algorithms
,
greedy
,
math
,
sortings
1700
x10575
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16610
1392D
Omkar and Bed Wars
dp
,
greedy
1700
x8824
1391C
Cyclic Permutations
combinatorics
,
dp
,
graphs
,
math
1500
x14931
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18865
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x16506
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x19107
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10530
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x13198
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x20356
1380C
Create The Teams
brute force
,
dp
,
greedy
,
implementation
,
sortings
1400
x20506
1380B
Universal Solution
greedy
1400
x14532
1379B
Dubious Cyrpto
binary search
,
brute force
,
math
,
number theory
1500
x12597
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11875
1375C
Element Extermination
constructive algorithms
,
data structures
,
greedy
1400
x20973
1374E1
Reading Books (easy version)
data structures
,
greedy
,
sortings
1600
x13930
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x23340
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15485
1373C
Pluses and Minuses
math
1300
x18266
1372C
Omkar and Baseball
constructive algorithms
,
math
1500
x17702
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x27481
1371D
Grid-00100
constructive algorithms
,
greedy
,
implementation
1600
x12938
1371C
A Cookie for You
greedy
,
implementation
,
math
1300
x20426
1370C
Number Game
games
,
math
,
number theory
1400
x24310
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19462
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11666
1368C
Even Picture
constructive algorithms
1500
x13277
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x19526
1367C
Social Distance
constructive algorithms
,
greedy
,
math
1300
x23340
1366C
Palindromic Paths
greedy
,
math
1500
x13485
1366B
Shuffle
math
,
two pointers
1300
x20497
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x16982
1365C
Rotation Matching
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x22910
1365B
Trouble Sort
constructive algorithms
,
implementation
1300
x26658
1364C
Ehab and Prefix MEXs
brute force
,
constructive algorithms
,
greedy
1600
x13056
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x19494
1363C
Game On Leaves
games
,
trees
1600
x18471
1363B
Subsequence Hate
implementation
,
strings
1400
x23423
1362C
Johnny and Another Rating Drop
bitmasks
,
greedy
,
math
1400
x17990
1361A
Johnny and Contribution
constructive algorithms
,
graphs
,
greedy
,
sortings
1700
x8383
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x12280
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x25033
1360D
Buying Shovels
math
,
number theory
1300
x32389
1359C
Mixing Water
binary search
,
math
1700
x13692
1358C
Celex Update
math
1600
x17262
1355D
Game With Array
constructive algorithms
,
math
1400
x17910
1354C1
Simple Polygon Embedding
binary search
,
geometry
,
math
,
ternary search
1400
x15613
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x17923
1352G
Special Permutation
constructive algorithms
1600
x20847
1352F
Binary String Reconstruction
constructive algorithms
,
dfs and similar
,
math
1500
x16905
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x20210
1352D
Alice, Bob and Candies
implementation
1300
x25789
1351C
Skier
data structures
,
implementation
1400
x8499
1350B
Orac and Models
dp
,
math
,
number theory
1400
x21711
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x16751
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14544
1348B
Phoenix and Beauty
constructive algorithms
,
data structures
,
greedy
,
sortings
1400
x25138
1346E
Magic Tricks
*special problem
,
dp
,
graphs
1700
x377
1346D
Constructing the Dungeon
*special problem
,
graphs
,
greedy
1600
x488
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x591
1346B
Boot Camp
*special problem
,
greedy
1400
x1189
1344A
Hilbert's Hotel
math
,
number theory
,
sortings
1600
x15570
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12558
1342C
Yet Another Counting Problem
math
,
number theory
1600
x13955
1341B
Nastya and Door
greedy
,
implementation
1300
x19457
1340B
Nastya and Scoreboard
bitmasks
,
dp
,
graphs
,
greedy
1700
x7820
1340A
Nastya and Strange Generator
brute force
,
data structures
,
greedy
,
implementation
1500
x13386
1338A
Powered Addition
greedy
,
math
1500
x23589
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x11313
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x20113
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10787
1335D
Anti-Sudoku
constructive algorithms
,
implementation
1300
x27218
1334C
Circle of Monsters
brute force
,
constructive algorithms
,
greedy
,
math
1600
x16486
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12512
1332D
Walk on Matrix
bitmasks
,
constructive algorithms
,
math
1700
x8150
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x16354
1332B
Composite Coloring
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1400
x17495
1330B
Dreamoon Likes Permutations
implementation
,
math
1400
x13978
1329B
Dreamoon Likes Sequences
bitmasks
,
combinatorics
,
math
1700
x6653
1328B
K-th Beautiful String
binary search
,
brute force
,
combinatorics
,
implementation
,
math
1300
x28854
1327C
Game with Chips
constructive algorithms
,
implementation
1600
x13361
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x12005
1326C
Permutation Partitions
combinatorics
,
greedy
,
math
1300
x15581
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x11978
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x13457
1324E
Sleeping Schedule
dp
,
implementation
1700
x13273
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x27791
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