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Codeforces functionality may be limited from
June 18, 19:00 (UTC)
to
June 19, 3:00 AM (UTC)
due to technical maintenance. Polygon will work as usual.
×
→ Pay attention
Before contest
Codeforces Round 954 (Div. 3)
5 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
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5286
149B
Martian Clock
implementation
1600
x2229
149A
Business trip
greedy
,
implementation
,
sortings
900
x38265
148E
Porcelain
dp
1900
x3821
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x6864
148C
Terse princess
constructive algorithms
,
greedy
1700
x3075
148B
Escape
implementation
,
math
1500
x5314
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x88457
147B
Smile House
binary search
,
graphs
,
matrices
2500
x751
147A
Punctuation
implementation
,
strings
1300
x3568
146B
Lucky Mask
brute force
,
implementation
1300
x4264
146A
Lucky Ticket
implementation
800
x14740
145E
Lucky Queries
data structures
2400
x2975
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x242
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1892
145B
Lucky Number 2
constructive algorithms
1800
x2159
145A
Lucky Conversion
greedy
,
implementation
1200
x6981
144E
Competition
data structures
,
greedy
2200
x566
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3824
144C
Anagram Search
implementation
,
strings
1500
x3920
144B
Meeting
implementation
1300
x5085
144A
Arrival of the General
implementation
800
x90661
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4932
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13239
142E
Help Greg the Dwarf 2
geometry
3000
x80
142D
Help Shrek and Donkey 2
games
2600
x339
142C
Help Caretaker
brute force
,
dp
2300
x903
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2144
142A
Help Farmer
brute force
,
math
1600
x2585
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x868
141D
Take-off Ramps
graphs
,
shortest paths
2300
x884
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2376
141B
Hopscotch
geometry
,
math
1400
x5167
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x79115
140F
New Year Snowflake
geometry
,
sortings
2600
x363
140E
New Year Garland
combinatorics
,
dp
2600
x875
140D
New Year Contest
greedy
,
sortings
1800
x2197
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4221
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1525
140A
New Year Table
geometry
,
math
1700
x4097
139B
Wallpaper
implementation
,
math
1600
x1283
139A
Petr and Book
implementation
1000
x29377
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x169
138D
World of Darkraft
dp
,
games
2500
x474
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x847
138B
Digits Permutations
greedy
1900
x1012
138A
Literature Lesson
implementation
1600
x2347
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1198
137D
Palindromes
dp
,
strings
1900
x1481
137C
History
sortings
1500
x7110
137B
Permutation
greedy
1000
x13391
137A
Postcards and photos
implementation
900
x6984
136B
Ternary Logic
implementation
,
math
1100
x4762
136A
Presents
implementation
800
x111167
135E
Weak Subsequence
combinatorics
3000
x267
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x294
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1325
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2304
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7465
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x461
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x1933
134A
Average Numbers
brute force
,
implementation
1200
x3821
133B
Unary
implementation
1200
x8685
133A
HQ9+
implementation
900
x101413
132E
Bits of merry old England
flows
,
graphs
2700
x526
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x607
132C
Logo Turtle
dp
1800
x2281
132B
Piet
implementation
2100
x513
132A
Turing Tape
implementation
1300
x2746
131F
Present to Mom
binary search
,
two pointers
2000
x602
131E
Yet Another Task with Queens
sortings
1700
x1822
131D
Subway
dfs and similar
,
graphs
1600
x4529
131C
The World is a Theatre
combinatorics
,
math
1400
x10730
131B
Opposites Attract
implementation
,
math
1200
x6892
131A
cAPS lOCK
implementation
,
strings
1000
x82376
130J
Date calculation
*special problem
1800
x327
130I
Array sorting
*special problem
,
sortings
2300
x166
130H
Balanced brackets
*special problem
1600
x541
130G
CAPS LOCK ON
*special problem
1700
x275
130F
Prime factorization
*special problem
1600
x275
130E
Tribonacci numbers
*special problem
1600
x294
130D
Exponentiation
*special problem
1500
x384
130C
Decimal sum
*special problem
1500
x487
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x518
130A
Hexagonal numbers
*special problem
,
implementation
900
x1529
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11798
129A
Cookies
implementation
900
x21967
128E
Birthday
geometry
,
math
2900
x97
128D
Numbers
constructive algorithms
,
implementation
2000
x1094
128C
Games with Rectangle
combinatorics
,
dp
2000
x2732
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2475
128A
Statues
dfs and similar
1500
x3138
127B
Canvas Frames
implementation
1000
x8318
127A
Wasted Time
geometry
900
x10817
126E
Pills
brute force
,
flows
2900
x83
126D
Fibonacci Sums
dp
,
math
2300
x809
126C
E-reader Display
constructive algorithms
,
greedy
2000
x713
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x18172
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1422
125E
MST Company
binary search
,
graphs
2400
x1020
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