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Before contest
Codeforces Round 876 (Div. 2)
17:15:09
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Difficulty:
—
divide and conquer
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
#
Name
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x49
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x56
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x59
1470F
Strange Covering
divide and conquer
3500
x64
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x78
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x97
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x109
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x109
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x116
1770G
Koxia and Bracket
divide and conquer
,
fft
,
math
3400
x122
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x138
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x149
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x154
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x155
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x155
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x164
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x165
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x173
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x176
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x183
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x187
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x188
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x201
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x217
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x220
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x225
1425B
Blue and Red of Our Faculty!
divide and conquer
,
dp
2600
x240
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x256
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x261
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x261
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x263
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x263
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x266
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x275
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x275
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x276
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x276
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x280
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x289
217C
Formurosa
divide and conquer
,
dp
,
expression parsing
2600
x291
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x298
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x300
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x305
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x309
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x316
117D
Not Quick Transformation
divide and conquer
,
math
2500
x316
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x318
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x321
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x327
1218E
Product Tuples
divide and conquer
,
fft
2500
x327
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x328
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x328
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x328
1250M
SmartGarden
constructive algorithms
,
divide and conquer
2500
x333
573D
Bear and Cavalry
data structures
,
divide and conquer
,
dp
3000
x348
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x351
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x352
1523G
Try Booking
data structures
,
divide and conquer
3200
x356
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x356
1379F2
Chess Strikes Back (hard version)
data structures
,
divide and conquer
2800
x368
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x370
101E
Candies and Stones
divide and conquer
,
dp
2500
x379
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x380
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x383
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x384
793F
Julia the snail
data structures
,
divide and conquer
,
dp
3000
x393
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x401
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x404
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x410
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x418
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x425
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x427
763E
Timofey and our friends animals
data structures
,
divide and conquer
,
dsu
2900
x427
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x431
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x433
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x436
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x440
480E
Parking Lot
data structures
,
divide and conquer
2800
x447
512E
Fox And Polygon
constructive algorithms
,
divide and conquer
2900
x463
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x500
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x504
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x506
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x511
413E
Maze 2D
data structures
,
divide and conquer
2200
x511
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x529
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x538
1004F
Sonya and Bitwise OR
bitmasks
,
data structures
,
divide and conquer
2600
x538
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x547
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x550
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x561
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x562
161C
Abracadabra
divide and conquer
2400
x574
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x575
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x577
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x577
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x590
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x592
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x599
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x599
232E
Quick Tortoise
bitmasks
,
divide and conquer
,
dp
3000
x605
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