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Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)
05:58:17
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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
1327E
Count The Blocks
combinatorics
,
dp
,
math
1800
x8824
1327D
Infinite Path
brute force
,
dfs and similar
,
graphs
,
math
,
number theory
2200
x3245
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x75
1326F2
Wise Men (Hard Version)
bitmasks
,
dp
,
math
3200
x478
1326F1
Wise Men (Easy Version)
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2600
x831
1326E
Bombs
data structures
,
two pointers
2400
x2174
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9937
1325F
Ehab's Last Theorem
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x1907
1325E
Ehab's REAL Number Theory Problem
brute force
,
dfs and similar
,
graphs
,
number theory
,
shortest paths
2600
x2012
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x11902
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x9551
1324E
Sleeping Schedule
dp
,
implementation
1700
x13105
1322F
Assigning Fares
dp
,
trees
3500
x93
1322E
Median Mountain Range
data structures
3300
x300
1322D
Reality Show
bitmasks
,
dp
2800
x707
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x2370
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x4148
1320F
Blocks and Sensors
brute force
3500
x153
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x803
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1421
1320C
World of Darkraft: Battle for Azathoth
brute force
,
data structures
,
sortings
2000
x3068
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x5968
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x783
1316E
Team Building
bitmasks
,
dp
,
greedy
,
sortings
2300
x3783
1316D
Nash Matrix
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2000
x3360
1316C
Primitive Primes
constructive algorithms
,
math
,
ternary search
1800
x7231
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x530
1313D
Happy New Year
bitmasks
,
dp
,
implementation
2500
x1314
1313C2
Skyscrapers (hard version)
data structures
,
dp
,
greedy
1900
x6391
1313B
Different Rules
constructive algorithms
,
greedy
,
implementation
,
math
1700
x6651
1312G
Autocompletion
data structures
,
dfs and similar
,
dp
2600
x968
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x887
1312E
Array Shrinking
dp
,
greedy
2100
x5769
1312D
Count the Arrays
combinatorics
,
math
1700
x9246
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x4154
1311E
Construct the Binary Tree
brute force
,
constructive algorithms
,
trees
2200
x2319
1311D
Three Integers
brute force
,
math
2000
x8924
1310F
Bad Cryptography
math
,
number theory
3400
x72
1310E
Strange Function
dp
2900
x273
1310D
Tourism
dp
,
graphs
,
probabilities
2300
x1516
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x496
1310B
Double Elimination
dp
,
implementation
2500
x492
1310A
Recommendations
data structures
,
greedy
,
sortings
1700
x5147
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x491
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x574
1307E
Cow and Treats
binary search
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
2500
x1266
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6241
1305H
Kuroni the Private Tutor
binary search
,
greedy
3500
x113
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x960
1305F
Kuroni and the Punishment
math
,
number theory
,
probabilities
2500
x2562
1305E
Kuroni and the Score Distribution
constructive algorithms
,
greedy
,
implementation
,
math
2200
x3063
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4928
1304F2
Animal Observation (hard version)
data structures
,
dp
,
greedy
2400
x1494
1304F1
Animal Observation (easy version)
data structures
,
dp
2300
x1731
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x5138
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6270
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x774
1303F
Number of Components
dsu
,
implementation
2800
x519
1303E
Erase Subsequences
dp
,
strings
2200
x2740
1303D
Fill The Bag
bitmasks
,
greedy
1900
x7020
1301F
Super Jaber
dfs and similar
,
graphs
,
implementation
,
shortest paths
2600
x1234
1301E
Nanosoft
binary search
,
data structures
,
dp
,
implementation
2500
x1489
1301D
Time to Run
constructive algorithms
,
graphs
,
implementation
2000
x3968
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9262
1299E
So Mean
interactive
,
math
3400
x155
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x424
1299C
Water Balance
data structures
,
geometry
,
greedy
2100
x3860
1299B
Aerodynamic
geometry
1800
x5215
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2849
1296E2
String Coloring (hard version)
data structures
,
dp
2000
x4968
1296E1
String Coloring (easy version)
constructive algorithms
,
dp
,
graphs
,
greedy
,
sortings
1800
x7376
1295F
Good Contest
combinatorics
,
dp
,
probabilities
2700
x1174
1295E
Permutation Separation
data structures
,
divide and conquer
2200
x2496
1295D
Same GCDs
math
,
number theory
1800
x8710
1295B
Infinite Prefixes
math
,
strings
1700
x9255
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5611
1294E
Obtain a Permutation
greedy
,
implementation
,
math
1900
x4867
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x309
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x331
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x788
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x2029
1292B
Aroma's Search
brute force
,
constructive algorithms
,
geometry
,
greedy
,
implementation
1700
x6281
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x652
1290F
Making Shapes
dp
3500
x359
1290E
Cartesian Tree
data structures
3300
x532
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x816
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1715
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5238
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x451
1288E
Messenger Simulator
data structures
2000
x3525
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x7010
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x242
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x494
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x566
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x617
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1409
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4637
1286A
Garland
dp
,
greedy
,
sortings
1800
x8676
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x1097
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1810
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