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Before contest
Codeforces Round (Div. 2)
6 days
→ Filter Problems
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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Custom test
Problems
#
Name
1326F1
Wise Men (Easy Version)
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2600
x839
1326E
Bombs
data structures
,
two pointers
2400
x2181
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x10163
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x12092
1326C
Permutation Partitions
combinatorics
,
greedy
,
math
1300
x15632
1326B
Maximums
implementation
,
math
900
x24038
1326A
Bad Ugly Numbers
constructive algorithms
,
number theory
1000
x30319
1325F
Ehab's Last Theorem
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x1983
1325E
Ehab's REAL Number Theory Problem
brute force
,
dfs and similar
,
graphs
,
number theory
,
shortest paths
2600
x2056
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x12122
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x13661
1325B
CopyCopyCopyCopyCopy
greedy
,
implementation
800
x36006
1325A
EhAb AnD gCd
constructive algorithms
,
greedy
,
number theory
800
x40086
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x10018
1324E
Sleeping Schedule
dp
,
implementation
1700
x13579
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x28317
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x27958
1324B
Yet Another Palindrome Problem
brute force
,
strings
1100
x28476
1324A
Yet Another Tetris Problem
implementation
,
number theory
900
x25956
1323B
Count Subrectangles
binary search
,
greedy
,
implementation
1500
x9004
1323A
Even Subset Sum Problem
brute force
,
dp
,
greedy
,
implementation
800
x19774
1322F
Assigning Fares
dp
,
trees
3500
x100
1322E
Median Mountain Range
data structures
3300
x303
1322D
Reality Show
bitmasks
,
dp
2800
x747
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x2424
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x4209
1322A
Unusual Competitions
greedy
1300
x12433
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9818
1321A
Contest for Robots
greedy
900
x14298
1320F
Blocks and Sensors
brute force
3500
x161
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x825
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1503
1320C
World of Darkraft: Battle for Azathoth
brute force
,
data structures
,
sortings
2000
x3108
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x6047
1320A
Journey Planning
data structures
,
dp
,
greedy
,
math
,
sortings
1400
x16381
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x807
1316E
Team Building
bitmasks
,
dp
,
greedy
,
sortings
2300
x4058
1316D
Nash Matrix
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2000
x3386
1316C
Primitive Primes
constructive algorithms
,
math
,
ternary search
1800
x7288
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x11270
1316A
Grade Allocation
implementation
800
x18680
1315C
Restoring Permutation
greedy
1200
x10089
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x9198
1315A
Dead Pixel
implementation
800
x12090
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x542
1313D
Happy New Year
bitmasks
,
dp
,
implementation
2500
x1339
1313C2
Skyscrapers (hard version)
data structures
,
dp
,
greedy
1900
x6495
1313C1
Skyscrapers (easy version)
brute force
,
data structures
,
dp
,
greedy
1500
x10436
1313B
Different Rules
constructive algorithms
,
greedy
,
implementation
,
math
1700
x6675
1313A
Fast Food Restaurant
brute force
,
greedy
,
implementation
900
x15500
1312G
Autocompletion
data structures
,
dfs and similar
,
dp
2600
x985
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x914
1312E
Array Shrinking
dp
,
greedy
2100
x5958
1312D
Count the Arrays
combinatorics
,
math
1700
x9469
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x16541
1312B
Bogosort
constructive algorithms
,
sortings
1000
x26830
1312A
Two Regular Polygons
geometry
,
greedy
,
math
,
number theory
800
x25927
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x4251
1311E
Construct the Binary Tree
brute force
,
constructive algorithms
,
trees
2200
x2352
1311D
Three Integers
brute force
,
math
2000
x9055
1311C
Perform the Combo
brute force
1300
x16029
1311B
WeirdSort
dfs and similar
,
sortings
1200
x18901
1311A
Add Odd or Subtract Even
greedy
,
implementation
,
math
800
x41936
1310F
Bad Cryptography
math
,
number theory
3400
x75
1310E
Strange Function
dp
2900
x290
1310D
Tourism
dp
,
graphs
,
probabilities
2300
x1578
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x522
1310B
Double Elimination
dp
,
implementation
2500
x517
1310A
Recommendations
data structures
,
greedy
,
sortings
1700
x5175
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x502
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x590
1307E
Cow and Treats
binary search
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
2500
x1280
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6387
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11827
1307B
Cow and Friend
geometry
,
greedy
,
math
1300
x13258
1307A
Cow and Haybales
greedy
,
implementation
800
x14957
1305H
Kuroni the Private Tutor
binary search
,
greedy
3500
x120
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x986
1305F
Kuroni and the Punishment
math
,
number theory
,
probabilities
2500
x2660
1305E
Kuroni and the Score Distribution
constructive algorithms
,
greedy
,
implementation
,
math
2200
x3105
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x5008
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x14651
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11755
1305A
Kuroni and the Gifts
brute force
,
constructive algorithms
,
greedy
,
sortings
800
x14080
1304F2
Animal Observation (hard version)
data structures
,
dp
,
greedy
2400
x1535
1304F1
Animal Observation (easy version)
data structures
,
dp
2300
x1767
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x5242
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6329
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x16392
1304B
Longest Palindrome
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
1100
x17873
1304A
Two Rabbits
math
800
x25446
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x797
1303F
Number of Components
dsu
,
implementation
2800
x534
1303E
Erase Subsequences
dp
,
strings
2200
x2816
1303D
Fill The Bag
bitmasks
,
greedy
1900
x7100
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x12168
1303B
National Project
math
1400
x15778
1303A
Erasing Zeroes
implementation
,
strings
800
x32226
1301F
Super Jaber
dfs and similar
,
graphs
,
implementation
,
shortest paths
2600
x1279
1301E
Nanosoft
binary search
,
data structures
,
dp
,
implementation
2500
x1525
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