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Before contest
Codeforces Round (Div. 2)
5 days
→ Filter Problems
Difficulty:
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binary search
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
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
x29
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x41
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x54
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x61
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x68
1876F
Indefinite Clownfish
binary search
,
graphs
3500
x71
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x77
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x78
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x83
1906D
Spaceship Exploration
binary search
,
geometry
2800
x84
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x84
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1071E
Rain Protection
binary search
,
geometry
3500
x88
1275F
Шардирование постов
*special problem
,
binary search
,
interactive
x91
925F
Parametric Circulation
binary search
,
flows
3100
x93
649E
Автобус
binary search
,
data structures
,
greedy
,
sortings
2100
x102
185E
Soap Time! - 2
binary search
,
data structures
3000
x102
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x104
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x106
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x107
1305H
Kuroni the Private Tutor
binary search
,
greedy
3500
x107
645G
Armistice Area Apportionment
binary search
,
geometry
3200
x108
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x110
1170F
Wheels
*special problem
,
binary search
,
greedy
x113
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x114
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x115
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x116
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x118
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x121
1250I
Show Must Go On
binary search
,
brute force
,
greedy
,
shortest paths
3100
x126
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x140
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x143
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x146
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x146
1431F
Neural Network Problem
*special problem
,
binary search
,
greedy
2100
x152
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
x154
887E
Little Brother
binary search
,
geometry
,
sortings
2800
x161
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x165
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x166
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x166
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x167
1329E
Dreamoon Loves AA
binary search
,
greedy
3300
x167
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x175
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x183
1211E
Double Permutation Inc.
*special problem
,
binary search
,
greedy
2000
x188
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x195
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x204
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x207
1533F
Binary String Partition
*special problem
,
binary search
,
greedy
x208
1098E
Fedya the Potter
binary search
,
implementation
,
math
,
number theory
3400
x208
1500E
Subset Trick
binary search
,
data structures
3300
x209
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x216
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x216
309E
Sheep
binary search
,
greedy
2900
x216
1190E
Tokitsukaze and Explosion
binary search
,
greedy
3100
x220
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x222
1211D
Teams
*special problem
,
binary search
,
greedy
,
math
2000
x222
1223G
Wooden Raft
binary search
,
math
,
number theory
3200
x225
164D
Minimum Diameter
binary search
,
brute force
3100
x228
1109C
Sasha and a Patient Friend
binary search
,
data structures
,
implementation
2800
x241
607E
Cross Sum
binary search
,
geometry
3300
x243
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x246
1832F
Zombies
binary search
,
dp
3200
x247
1170E
Sliding Doors
*special problem
,
binary search
x251
1900F
Local Deletions
binary search
,
data structures
,
implementation
2800
x252
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x252
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x252
1297D
Bonus Distribution
*special problem
,
binary search
,
greedy
,
sortings
x257
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x259
1482G
Vabank
binary search
,
interactive
3200
x261
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x265
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x266
1531E3
Сортировка слиянием
*special problem
,
binary search
x267
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x267
1533E
Chess Team Forming
*special problem
,
binary search
,
data structures
,
greedy
x268
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x268
1693F
I Might Be Wrong
binary search
,
greedy
,
two pointers
3400
x273
1572E
Polygon
binary search
,
dp
,
geometry
3000
x276
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x283
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x283
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x288
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x289
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x295
721E
Road to Home
binary search
,
dp
2700
x299
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x299
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x300
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x305
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x306
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x309
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x309
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x311
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x313
1488D
Problemsolving Marathon
*special problem
,
binary search
,
greedy
1900
x313
774L
Bars
*special problem
,
binary search
2000
x321
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x326
1182F
Maximum Sine
binary search
,
data structures
,
number theory
2700
x328
713E
Sonya Partymaker
binary search
,
dp
3300
x333
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x333
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x336
1773H
Hot and Cold
binary search
,
interactive
2600
x336
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