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Before contest
Codeforces Round 973 (Div. 2)
13:38:35
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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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Custom test
Problems
#
Name
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x684
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x776
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x672
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x2005
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x323
1583F
Defender of Childhood Dreams
bitmasks
,
constructive algorithms
,
divide and conquer
2500
x1288
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x872
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1364
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x3633
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x203
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x700
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x669
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x450
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9758
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5797
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x408
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x14624
1527E
Partition Game
binary search
,
data structures
,
divide and conquer
,
dp
2500
x2306
1523G
Try Booking
data structures
,
divide and conquer
3200
x463
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x182
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2559
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2147
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x19463
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x3162
1470F
Strange Covering
divide and conquer
3500
x120
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x920
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9210
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3612
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x2209
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1789
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1339
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2293
1425B
Blue and Red of Our Faculty!
divide and conquer
,
dp
2600
x280
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x522
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x140
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4670
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1880
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4399
1408F
Two Different
constructive algorithms
,
divide and conquer
2300
x2363
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x5417
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x513
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x19231
1379F2
Chess Strikes Back (hard version)
data structures
,
divide and conquer
2800
x507
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x426
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x417
1373G
Pawns
data structures
,
divide and conquer
,
greedy
2600
x788
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15574
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x442
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x614
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x1417
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x3212
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x209
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x805
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x4235
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x791
1295E
Permutation Separation
data structures
,
divide and conquer
2200
x2529
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7699
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1915
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x505
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x386
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x607
1250M
SmartGarden
constructive algorithms
,
divide and conquer
2500
x360
1237C2
Balanced Removals (Harder)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
implementation
,
sortings
1900
x4330
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x2046
1218E
Product Tuples
divide and conquer
,
fft
2500
x377
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x498
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x584
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x7201
1192B
Dynamic Diameter
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
trees
x1146
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x2265
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x624
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x476
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x174
1177B
Digits Sequence (Hard Edition)
binary search
,
divide and conquer
,
implementation
1800
x2553
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x478
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1815
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3570
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1713
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x11566
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2998
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3873
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6899
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x886
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x493
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1203
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1927
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x430
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1942
1111C
Creative Snap
binary search
,
brute force
,
divide and conquer
,
math
1700
x6239
1100F
Ivan and Burgers
data structures
,
divide and conquer
,
greedy
,
math
2500
x2399
1096G
Lucky Tickets
divide and conquer
,
dp
,
fft
2400
x1455
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x67
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x236
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x6178
1041F
Ray in the tube
data structures
,
divide and conquer
,
dp
,
math
2500
x1485
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x336
1004F
Sonya and Bitwise OR
bitmasks
,
data structures
,
divide and conquer
2600
x741
1000F
One Occurrence
data structures
,
divide and conquer
2400
x3809
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x434
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x659
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