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Codeforces and Polygon may be unavailable from
May 23, 4:00 (UTC)
to
May 23, 8:00 (UTC)
due to technical maintenance.
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Problems
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Status
Standings
Custom test
Problems
#
Name
433B
Kuriyama Mirai's Stones
dp
,
implementation
,
sortings
1200
x36581
433A
Kitahara Haruki's Gift
brute force
,
implementation
1100
x15802
432B
Football Kit
brute force
,
greedy
,
implementation
1200
x11484
432A
Choosing Teams
greedy
,
implementation
,
sortings
800
x56891
431C
k-Tree
dp
,
implementation
,
trees
1600
x24642
431B
Shower Line
brute force
,
implementation
1200
x10506
431A
Black Square
implementation
800
x51780
427E
Police Patrol
greedy
,
implementation
,
math
,
ternary search
2000
x1396
427B
Prison Transfer
data structures
,
implementation
1100
x13731
427A
Police Recruits
implementation
800
x72909
426B
Sereja and Mirroring
implementation
1300
x3769
426A
Sereja and Mugs
implementation
800
x9039
424B
Megacity
binary search
,
greedy
,
implementation
,
sortings
1200
x7355
424A
Squats
implementation
900
x8211
421A
Pasha and Hamsters
constructive algorithms
,
implementation
800
x5785
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1218
420B
Online Meeting
implementation
1800
x1009
420A
Start Up
implementation
1000
x5894
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4610
417B
Crash
implementation
1400
x1751
417A
Elimination
dp
,
implementation
,
math
1500
x2881
416D
Population Size
greedy
,
implementation
,
math
2400
x905
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x7658
416B
Art Union
brute force
,
dp
,
implementation
1300
x8535
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8674
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6126
415A
Mashmokh and Lights
implementation
900
x8800
413B
Spyke Chatting
implementation
1300
x1679
413A
Data Recovery
implementation
1200
x2540
412E
E-mail Addresses
implementation
1900
x808
412C
Pattern
implementation
,
strings
1200
x3855
412A
Poster
greedy
,
implementation
900
x4314
411C
Kicker
implementation
1700
x1049
411B
Multi-core Processor
implementation
1600
x1253
411A
Password Check
*special problem
,
implementation
800
x7002
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8693
408B
Garland
implementation
1200
x8892
408A
Line to Cashier
implementation
900
x11020
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x955
407B
Long Path
dp
,
implementation
1600
x6416
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4754
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x228
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3089
405C
Unusual Product
implementation
,
math
1600
x4571
405A
Gravity Flip
greedy
,
implementation
,
sortings
900
x94981
404E
Maze 1D
binary search
,
greedy
,
implementation
2200
x562
404D
Minesweeper 1D
dp
,
implementation
1900
x2064
404B
Marathon
implementation
,
math
1500
x2895
404A
Valera and X
implementation
1000
x22992
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x201
402B
Trees in a Row
brute force
,
implementation
1400
x3689
401C
Team
constructive algorithms
,
greedy
,
implementation
1400
x19307
401B
Sereja and Contests
greedy
,
implementation
,
math
1200
x4387
401A
Vanya and Cards
implementation
,
math
800
x15884
400C
Inna and Huge Candy Matrix
implementation
,
math
1500
x2873
400B
Inna and New Matrix of Candies
brute force
,
implementation
,
schedules
1200
x7355
400A
Inna and Choose Options
implementation
1000
x6406
399A
Pages
implementation
x4077
398A
Cards
constructive algorithms
,
implementation
x910
397B
On Corruption and Numbers
constructive algorithms
,
implementation
,
math
x735
397A
On Segment's Own Points
implementation
x2589
394D
Physical Education and Buns
brute force
,
implementation
,
math
x261
394A
Counting Sticks
brute force
,
implementation
x2633
391A
Genetic Engineering
implementation
,
two pointers
x1702
390B
Inna, Dima and Song
implementation
x1167
390A
Inna and Alarm Clock
implementation
x3453
389B
Fox and Cross
greedy
,
implementation
1100
x6825
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2436
387C
George and Number
greedy
,
implementation
1700
x2162
387A
George and Sleep
implementation
900
x9528
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x413
386B
Fly, freebies, fly!
binary search
,
brute force
,
implementation
1400
x2108
386A
Second-Price Auction
implementation
800
x5936
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9403
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x9554
385A
Bear and Raspberry
brute force
,
greedy
,
implementation
1000
x16240
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3488
384A
Coder
implementation
800
x15906
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x653
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x653
382C
Arithmetic Progression
implementation
,
sortings
1700
x8167
382A
Ksenia and Pan Scales
greedy
,
implementation
1100
x11810
381B
Sereja and Stairs
greedy
,
implementation
,
sortings
1100
x6590
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x60801
380B
Sereja and Tree
graphs
,
implementation
2400
x530
379B
New Year Present
constructive algorithms
,
implementation
1200
x7189
379A
New Year Candles
implementation
1000
x44628
378B
Semifinals
implementation
,
sortings
1300
x5139
376B
I.O.U.
implementation
1300
x6114
376A
Lever
implementation
,
math
900
x9037
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x398
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x4962
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x178
374C
Inna and Dima
dfs and similar
,
dp
,
graphs
,
implementation
1900
x2660
374A
Inna and Pink Pony
greedy
,
implementation
2000
x2843
373B
Making Sequences is Fun
binary search
,
implementation
,
math
1600
x2439
373A
Collecting Beats is Fun
implementation
900
x10329
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5349
371A
K-Periodic Array
greedy
,
implementation
,
math
1000
x5956
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x613
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implementation
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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