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Before contest
Codeforces Round (Div. 2)
5 days
→ Filter Problems
Difficulty:
—
greedy
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x2755
730E
Award Ceremony
greedy
,
implementation
2200
x772
730D
Running Over The Bridges
greedy
,
implementation
,
math
2200
x915
730A
Toda 2
greedy
,
implementation
1800
x1736
729E
Subordinates
constructive algorithms
,
data structures
,
graphs
,
greedy
,
sortings
1900
x2400
729D
Sea Battle
constructive algorithms
,
greedy
,
math
1700
x4094
729C
Road to Cinema
binary search
,
greedy
,
sortings
1700
x4190
727F
Polycarp's problems
binary search
,
dp
,
greedy
2300
x963
727D
T-shirts Distribution
constructive algorithms
,
flows
,
greedy
1800
x2080
725F
Family Photos
games
,
greedy
2900
x725
725E
Too Much Money
brute force
,
greedy
2600
x711
725D
Contest Balloons
data structures
,
greedy
1800
x3101
724E
Goods transportation
dp
,
flows
,
greedy
2900
x1673
724D
Dense Subsequence
data structures
,
greedy
,
strings
1900
x2461
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2283
724B
Batch Sort
brute force
,
greedy
,
implementation
,
math
1500
x4247
723F
st-Spanning Tree
dsu
,
graphs
,
greedy
,
implementation
2300
x1752
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x2275
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x7511
723C
Polycarp at the Radio
greedy
1600
x5225
722D
Generating Sets
binary search
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
1900
x3354
721D
Maxim and Array
constructive algorithms
,
data structures
,
greedy
,
math
2000
x2493
720A
Closing ceremony
greedy
2000
x961
719B
Anatoly and Cockroaches
greedy
1400
x8826
717B
R3D3’s Summer Adventure
dp
,
greedy
2700
x181
716B
Complete the Word
greedy
,
two pointers
1300
x13032
712C
Memory and De-Evolution
greedy
,
math
1600
x6215
709B
Checkpoints
greedy
,
implementation
,
sortings
1500
x5028
708C
Centroids
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2300
x4407
708B
Recover the String
constructive algorithms
,
greedy
,
implementation
,
math
1900
x3455
708A
Letters Cyclic Shift
constructive algorithms
,
greedy
,
implementation
,
strings
1200
x9815
704D
Captain America
flows
,
greedy
3100
x1011
704B
Ant Man
dp
,
graphs
,
greedy
2500
x2181
702A
Maximum Increase
dp
,
greedy
,
implementation
800
x55304
701A
Cards
greedy
,
implementation
800
x21222
700D
Huffman Coding on Segment
data structures
,
greedy
3100
x526
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x6618
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x10607
679B
Bear and Tower of Cubes
binary search
,
dp
,
greedy
2200
x2233
675E
Trains and Statistic
data structures
,
dp
,
greedy
2300
x3358
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3861
673B
Problems for Round
greedy
,
implementation
1300
x3668
671E
Organizing a Race
data structures
,
greedy
3300
x493
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1317
671B
Robin Hood
binary search
,
greedy
2000
x3296
671A
Recycling Bottles
dp
,
geometry
,
greedy
,
implementation
1800
x4400
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x18665
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x4184
665C
Simple Strings
dp
,
greedy
,
strings
1300
x17439
663A
Rebus
constructive algorithms
,
expression parsing
,
greedy
,
math
1800
x3788
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x164
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1716
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x10465
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1957
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x8007
659C
Tanya and Toys
greedy
,
implementation
1200
x11972
651B
Beautiful Paintings
greedy
,
sortings
1200
x12239
651A
Joysticks
dp
,
greedy
,
implementation
,
math
1100
x24156
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x681
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x2184
649E
Автобус
binary search
,
data structures
,
greedy
,
sortings
2100
x156
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x435
649C
Печать условий
constructive algorithms
,
greedy
,
sortings
1500
x558
648D
Собачки и миски
data structures
,
greedy
,
sortings
1900
x352
645E
Intellectual Inquiry
dp
,
greedy
,
strings
2200
x1411
645B
Mischievous Mess Makers
greedy
,
math
1200
x3711
639E
Bear and Paradox
binary search
,
greedy
,
math
,
sortings
2800
x617
639D
Bear and Contribution
data structures
,
greedy
,
sortings
,
two pointers
2400
x1067
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x2311
637D
Running with Obstacles
*special problem
,
data structures
,
dp
,
greedy
1600
x2126
628C
Bear and String Distance
greedy
,
strings
1300
x6532
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x1001
627C
Package Delivery
data structures
,
divide and conquer
,
greedy
2200
x1317
626G
Raffles
data structures
,
dp
,
greedy
,
math
3100
x607
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4619
625E
Frog Fights
data structures
,
greedy
2800
x419
625B
War of the Corporations
constructive algorithms
,
greedy
,
strings
1200
x11575
624B
Making a String
greedy
,
sortings
1100
x8404
623D
Birthday
greedy
,
math
,
probabilities
2700
x556
623B
Array GCD
dp
,
greedy
,
number theory
2300
x2375
622E
Ants in Leaves
dfs and similar
,
greedy
,
sortings
,
trees
2200
x2471
620C
Pearls in a Row
greedy
1500
x7892
618D
Hamiltonian Spanning Tree
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
2200
x1910
616B
Dinner with Emma
games
,
greedy
1000
x13184
615C
Running Track
dp
,
greedy
,
strings
,
trees
2000
x2465
613B
Skills
binary search
,
brute force
,
dp
,
greedy
,
sortings
,
two pointers
1900
x2481
612D
The Union of k-Segments
greedy
,
sortings
1800
x4377
611E
New Year and Three Musketeers
data structures
,
greedy
,
sortings
2400
x908
609F
Frogs and mosquitoes
data structures
,
greedy
2500
x1514
609D
Gadgets for dollars and pounds
binary search
,
greedy
,
two pointers
2000
x3184
609A
USB Flash Drives
greedy
,
implementation
,
sortings
800
x19494
605A
Sorting Railway Cars
constructive algorithms
,
greedy
1600
x7597
604B
More Cowbell
binary search
,
greedy
1400
x8997
603A
Alternative Thinking
dp
,
greedy
,
math
1600
x8261
600C
Make Palindrome
constructive algorithms
,
greedy
,
strings
1800
x7105
597B
Restaurant
dp
,
greedy
,
sortings
1600
x5683
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2336
596B
Wilbur and Array
greedy
,
implementation
1100
x10901
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x760
588A
Duff and Meat
greedy
900
x24336
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