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Before contest
Codeforces Round (Div. 2)
5 days
→ Filter Problems
Difficulty:
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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
271C
Secret
constructive algorithms
,
implementation
1500
x2918
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x12620
271A
Beautiful Year
brute force
800
x130766
270B
Multithreading
data structures
,
greedy
,
implementation
1400
x4094
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x44109
269E
String Theory
geometry
,
math
,
strings
3100
x108
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x433
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1626
269B
Greenhouse Effect
dp
1700
x6192
269A
Magical Boxes
greedy
,
math
1600
x3489
268E
Playlist
math
,
probabilities
,
sortings
2100
x981
268D
Wall Bars
dp
2300
x502
268C
Beautiful Sets of Points
constructive algorithms
,
implementation
1500
x13416
268B
Buttons
implementation
,
math
1000
x31424
268A
Games
brute force
800
x82825
267C
Berland Traffic
math
,
matrices
2700
x160
267B
Dominoes
dfs and similar
,
graphs
2000
x617
267A
Subtractions
math
,
number theory
900
x7268
266E
More Queries to Array...
data structures
,
math
2500
x770
266D
BerDonalds
graphs
,
math
,
shortest paths
2400
x758
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1338
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x129444
266A
Stones on the Table
implementation
800
x181860
265B
Roadside Trees (Simplified Edition)
greedy
,
implementation
1000
x17005
265A
Colorful Stones (Simplified Edition)
implementation
800
x35114
264E
Roadside Trees
data structures
,
dp
3000
x398
264D
Colorful Stones
dp
,
two pointers
2500
x408
264C
Choosing Balls
dp
2000
x2796
264B
Good Sequences
dp
,
number theory
1500
x9828
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10661
263E
Rhombus
brute force
,
data structures
,
dp
2500
x396
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3344
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1062
263B
Squares
greedy
,
implementation
,
sortings
900
x8784
263A
Beautiful Matrix
implementation
800
x231028
262B
Roma and Changing Signs
greedy
1200
x11047
262A
Roma and Lucky Numbers
implementation
800
x19390
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x406
261D
Maxim and Increasing Subsequence
dp
2600
x554
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x765
261B
Maxim and Restaurant
dp
,
math
,
probabilities
1900
x1374
261A
Maxim and Discounts
greedy
,
sortings
1400
x5118
260E
Dividing Kingdom
binary search
,
brute force
,
data structures
2500
x423
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1375
260C
Balls and Boxes
constructive algorithms
,
greedy
,
implementation
1700
x2937
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3759
260A
Adding Digits
implementation
,
math
1400
x14291
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x13788
259A
Little Elephant and Chess
brute force
,
strings
1000
x8982
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1043
258D
Little Elephant and Broken Sorting
dp
,
math
,
probabilities
2600
x1222
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1766
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1427
258A
Little Elephant and Bits
greedy
,
math
1100
x22337
257E
Greedy Elevator
data structures
,
implementation
2200
x277
257D
Sum
greedy
,
math
1900
x1559
257C
View Angle
brute force
,
geometry
,
math
1800
x4230
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x6921
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6415
256E
Lucky Arrays
data structures
2400
x656
256D
Liars and Serge
dp
2700
x256
255E
Furlo and Rublo and Game
games
,
implementation
,
math
2200
x836
255D
Mr. Bender and Square
binary search
,
implementation
,
math
1800
x1935
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4655
255B
Code Parsing
implementation
1200
x4898
255A
Greg's Workout
implementation
800
x27963
254E
Dormitory
dp
,
implementation
2100
x546
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x505
254C
Anagram
greedy
,
strings
1800
x1476
254B
Jury Size
brute force
,
implementation
1500
x2135
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x6908
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x523
253D
Table with Letters - 2
brute force
,
two pointers
2000
x822
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2550
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x10427
253A
Boys and Girls
greedy
1100
x11032
252B
Unsorting Array
brute force
,
sortings
1800
x1698
252A
Little Xor
brute force
,
implementation
1100
x5200
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x169
251D
Two Sets
bitmasks
,
math
2700
x444
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1013
251B
Playing with Permutations
implementation
,
math
1800
x1257
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16989
250E
Mad Joe
brute force
2000
x441
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x882
250C
Movie Critics
greedy
1600
x1894
250B
Restoring IPv6
implementation
,
strings
1500
x1955
250A
Paper Work
greedy
1000
x4020
249E
Endless Matrix
math
2600
x290
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x399
248E
Piglet's Birthday
dp
,
math
,
probabilities
2600
x570
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x487
248C
Robo-Footballer
binary search
,
geometry
2000
x802
248B
Chilly Willy
math
,
number theory
1400
x5225
248A
Cupboards
implementation
800
x21697
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x3034
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9273
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2612
246B
Increase and Decrease
greedy
,
math
1300
x11069
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9124
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