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Before contest
Codeforces Round (Div. 2)
5 days
→ Filter Problems
Difficulty:
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binary search
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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Custom test
Problems
#
Name
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x58
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x67
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x70
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x74
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x78
1305H
Kuroni the Private Tutor
binary search
,
greedy
3500
x78
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x85
1071E
Rain Protection
binary search
,
geometry
3500
x85
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x92
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x114
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x132
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x190
1034D
Intervals of Intervals
binary search
,
data structures
,
two pointers
3500
x371
1707E
Replace
binary search
,
data structures
3500
x397
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x131
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x140
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x143
1098E
Fedya the Potter
binary search
,
implementation
,
math
,
number theory
3400
x152
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x156
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x179
1693F
I Might Be Wrong
binary search
,
greedy
,
two pointers
3400
x217
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x109
1329E
Dreamoon Loves AA
binary search
,
greedy
3300
x137
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x146
1500E
Subset Trick
binary search
,
data structures
3300
x163
607E
Cross Sum
binary search
,
geometry
3300
x231
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x242
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x243
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x253
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x271
713E
Sonya Partymaker
binary search
,
dp
3300
x286
768G
The Winds of Winter
binary search
,
data structures
3300
x302
576E
Painting Edges
binary search
,
data structures
3300
x849
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x46
645G
Armistice Area Apportionment
binary search
,
geometry
3200
x102
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x109
1832F
Zombies
binary search
,
dp
3200
x151
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x187
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x202
1482G
Vabank
binary search
,
interactive
3200
x205
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x217
1223G
Wooden Raft
binary search
,
math
,
number theory
3200
x217
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x220
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x237
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x34
925F
Parametric Circulation
binary search
,
flows
3100
x82
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x111
1250I
Show Must Go On
binary search
,
brute force
,
greedy
,
shortest paths
3100
x123
1190E
Tokitsukaze and Explosion
binary search
,
greedy
3100
x198
164D
Minimum Diameter
binary search
,
brute force
3100
x208
855F
Nagini
binary search
,
data structures
3100
x304
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x336
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x554
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x562
587D
Duff in Mafia
2-sat
,
binary search
3100
x596
185E
Soap Time! - 2
binary search
,
data structures
3000
x89
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x220
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x221
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x221
1572E
Polygon
binary search
,
dp
,
geometry
3000
x225
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x234
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x292
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x293
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x320
1007C
Guess two numbers
binary search
,
interactive
3000
x332
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x338
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x360
1476F
Lanterns
binary search
,
data structures
,
dp
3000
x385
889E
Mod Mod Mod
binary search
,
dp
,
math
3000
x409
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x434
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x589
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x711
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x106
309E
Sheep
binary search
,
greedy
2900
x143
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x201
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x331
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x369
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x396
623C
Electric Charges
binary search
,
dp
2900
x427
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x465
685C
Optimal Point
binary search
,
math
2900
x487
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x544
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x752
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x881
505E
Mr. Kitayuta vs. Bamboos
binary search
,
greedy
2900
x1137
887E
Little Brother
binary search
,
geometry
,
sortings
2800
x122
1109C
Sasha and a Patient Friend
binary search
,
data structures
,
implementation
2800
x221
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x252
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x276
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x384
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x420
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x428
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x471
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x477
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x479
639E
Bear and Paradox
binary search
,
greedy
,
math
,
sortings
2800
x508
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x591
1279F
New Year and Handle Change
binary search
,
dp
2800
x699
983E
NN country
binary search
,
data structures
,
trees
2800
x721
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x95
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