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Before contest
Codeforces Round (Div. 2)
7 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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Problems
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Status
Standings
Custom test
Problems
#
Name
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x6157
245G
Suggested Friends
brute force
,
graphs
2200
x425
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x871
245E
Mishap in Club
greedy
,
implementation
1400
x3247
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2251
245C
Game with Coins
greedy
1700
x1524
245B
Internet Address
implementation
,
strings
1100
x5150
245A
System Administrator
implementation
800
x8318
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4410
244A
Dividing Orange
implementation
900
x7791
243E
Matrix
data structures
3000
x172
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x211
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x523
243B
Hydra
graphs
,
sortings
2000
x1187
243A
The Brand New Function
bitmasks
1600
x3840
242E
XOR on Segment
bitmasks
,
data structures
2000
x8635
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1849
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8219
242B
Big Segment
implementation
,
sortings
1100
x15365
242A
Heads or Tails
brute force
,
implementation
1100
x6294
241G
Challenging Balloons
constructive algorithms
1900
x541
241F
Race
brute force
,
implementation
2300
x261
241E
Flights
graphs
,
shortest paths
2600
x1006
241D
Numbers
2900
x348
241C
Mirror Box
geometry
,
implementation
2000
x509
241B
Friends
binary search
,
bitmasks
,
data structures
,
math
2700
x758
241A
Old Peykan
greedy
1300
x2215
240F
TorCoder
data structures
2600
x1817
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x354
239B
Easy Tape Programming
brute force
,
implementation
1500
x1364
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x18364
238E
Meeting Her
dp
,
graphs
,
shortest paths
2600
x348
238D
Tape Programming
data structures
,
implementation
2900
x246
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1091
238B
Boring Partition
constructive algorithms
1800
x1278
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2019
237E
Build String
flows
,
graphs
2000
x1610
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x549
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5617
237B
Young Table
implementation
,
sortings
1500
x2223
237A
Free Cash
implementation
1000
x26157
236B
Easy Number Challenge
implementation
,
number theory
1300
x13680
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x198423
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x760
235D
Graph Game
graphs
3000
x478
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x2044
235B
Let's Play Osu!
dp
,
math
,
probabilities
2000
x3389
235A
LCM Challenge
number theory
1600
x17163
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x558
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1463
234F
Fence
dp
1800
x1720
234E
Champions' League
implementation
1600
x991
234D
Cinema
implementation
1600
x1517
234C
Weather
dp
,
implementation
1300
x5381
234B
Reading
sortings
1000
x7034
234A
Lefthanders and Righthanders
implementation
1200
x4395
233B
Non-square Equation
binary search
,
brute force
,
math
1400
x7360
233A
Perfect Permutation
implementation
,
math
800
x41123
232E
Quick Tortoise
bitmasks
,
divide and conquer
,
dp
3000
x682
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x444
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x282
232B
Table
bitmasks
,
combinatorics
,
dp
,
math
1900
x1393
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2474
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1627
231D
Magic Box
brute force
,
geometry
1600
x4046
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x8387
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3571
231A
Team
brute force
,
greedy
800
x306679
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x71780
230A
Dragons
greedy
,
sortings
1000
x75941
229E
Gifts
combinatorics
,
dp
,
math
,
probabilities
2600
x455
229D
Towers
dp
,
greedy
,
two pointers
2100
x2134
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1601
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4517
229A
Shifts
brute force
,
two pointers
1500
x3464
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2372
228D
Zigzag
data structures
2100
x377
228C
Fractal Detector
dp
,
hashing
2000
x446
228B
Two Tables
brute force
,
implementation
1400
x3442
228A
Is your horseshoe on the other hoof?
implementation
800
x104481
227B
Effective Approach
implementation
1100
x26987
227A
Where do I Turn?
geometry
1300
x4073
226E
Noble Knight's Path
data structures
,
trees
2900
x450
226D
The table
constructive algorithms
,
greedy
2100
x953
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x850
226B
Naughty Stone Piles
greedy
1900
x1538
226A
Flying Saucer Segments
math
1400
x3923
225E
Unsolvable
math
,
number theory
2100
x785
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x917
225C
Barcode
dp
,
matrices
1700
x8856
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3119
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11286
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7211
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x25805
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x191
223D
Spider
geometry
,
graphs
3000
x70
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1516
223B
Two Strings
data structures
,
dp
,
strings
1900
x1736
223A
Bracket Sequence
data structures
,
expression parsing
,
implementation
1700
x2491
222E
Decoding Genome
dp
,
matrices
1900
x2603
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