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Before contest
Codeforces Round 974 (Div. 3)
05:45:47
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→ Filter Problems
Difficulty:
—
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
1394C
Boboniu and String
binary search
,
geometry
,
ternary search
2600
x1088
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x2005
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6758
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x363
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x387
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3995
1393C
Pinkie Pie Eats Patty-cakes
constructive algorithms
,
greedy
,
math
,
sortings
1700
x10608
1392I
Kevin and Grid
fft
,
graphs
,
math
3300
x204
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x704
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x486
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x2143
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3523
1392D
Omkar and Bed Wars
dp
,
greedy
1700
x8912
1391E
Pairs of Pairs
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2600
x1704
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x5262
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x392
1389F
Bicolored Segments
data structures
,
dp
,
graph matchings
,
sortings
2600
x977
1389E
Calendar Ambiguity
math
,
number theory
2200
x3438
1389D
Segment Intersections
brute force
,
greedy
,
implementation
,
math
2100
x4305
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x16694
1388E
Uncle Bogdan and Projections
data structures
,
geometry
,
sortings
2700
x590
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6417
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9703
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x129
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x900
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x1437
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x711
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x515
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x121
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x263
1385G
Columns Swaps
2-sat
,
dfs and similar
,
dsu
,
graphs
,
implementation
2300
x1549
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x2527
1385E
Directing Edges
constructive algorithms
,
dfs and similar
,
graphs
2000
x7421
1384B2
Koa and the Beach (Hard Version)
constructive algorithms
,
dp
,
greedy
,
implementation
2200
x2491
1384B1
Koa and the Beach (Easy Version)
brute force
,
dp
,
greedy
1900
x3892
1383F
Special Edges
flows
,
graphs
3200
x359
1383E
Strange Operation
combinatorics
,
data structures
,
dp
2800
x780
1383D
Rearrange
brute force
,
constructive algorithms
,
graphs
,
greedy
,
sortings
2800
x680
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x575
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x5042
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10569
1381E
Origami
geometry
,
math
,
sortings
3300
x267
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x672
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1626
1381B
Unmerge
dp
1800
x8886
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x13263
1380G
Circular Dungeon
greedy
,
math
,
probabilities
2600
x790
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x782
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x2176
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4688
1379F2
Chess Strikes Back (hard version)
data structures
,
divide and conquer
2800
x507
1379F1
Chess Strikes Back (easy version)
binary search
,
data structures
2700
x598
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x427
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1076
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5543
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x265
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x417
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1907
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x2229
1375E
Inversion SwapSort
constructive algorithms
,
greedy
,
sortings
2500
x3039
1375D
Replace by MEX
brute force
,
constructive algorithms
,
sortings
1900
x9163
1374F
Cyclic Shifts Sorting
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1293
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x924
1374E1
Reading Books (easy version)
data structures
,
greedy
,
sortings
1600
x14008
1373G
Pawns
data structures
,
divide and conquer
,
greedy
2600
x789
1373F
Network Coverage
binary search
,
constructive algorithms
,
data structures
,
greedy
2400
x1662
1373E
Sum of Digits
brute force
,
constructive algorithms
,
dp
,
greedy
2200
x2729
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15581
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x443
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x1180
1372D
Omkar and Circle
brute force
,
dp
,
games
,
greedy
2100
x5378
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x614
1371E2
Asterism (Hard Version)
binary search
,
combinatorics
,
dp
,
math
,
number theory
,
sortings
2300
x2340
1371E1
Asterism (Easy Version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
sortings
1900
x5225
1371D
Grid-00100
constructive algorithms
,
greedy
,
implementation
1600
x12976
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1471
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1590
1370E
Binary Subsequence Rotation
binary search
,
constructive algorithms
,
data structures
,
greedy
2100
x4873
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9610
1369F
BareLee
dfs and similar
,
dp
,
games
2700
x645
1369E
DeadLee
data structures
,
dfs and similar
,
greedy
,
implementation
,
sortings
2400
x2239
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x8599
1368H2
Breadboard Capacity (hard version)
3500
x226
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x349
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x592
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x1039
1368E
Ski Accidents
constructive algorithms
,
graphs
,
greedy
2500
x2208
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11771
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1656
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x3253
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5431
1367D
Task On The Board
constructive algorithms
,
greedy
,
implementation
,
sortings
1800
x8320
1366G
Construct the String
data structures
,
dp
,
strings
2700
x544
1366F
Jog Around The Graph
binary search
,
dp
,
geometry
,
graphs
2700
x802
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x4265
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x10463
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x1159
1365F
Swaps Again
constructive algorithms
,
implementation
,
sortings
2100
x4437
1365E
Maximum Subsequence Value
brute force
,
constructive algorithms
1900
x7826
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x17191
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