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Rayan
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Before contest
Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2)
3 days
Register now »
*has extra registration
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Difficulty:
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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
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Custom test
Problems
#
Name
1368E
Ski Accidents
constructive algorithms
,
graphs
,
greedy
2500
x2227
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11964
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1684
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x3305
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5492
1367D
Task On The Board
constructive algorithms
,
greedy
,
implementation
,
sortings
1800
x8379
1366G
Construct the String
data structures
,
dp
,
strings
2700
x554
1366F
Jog Around The Graph
binary search
,
dp
,
geometry
,
graphs
2700
x818
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x4304
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x10688
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x1176
1365F
Swaps Again
constructive algorithms
,
implementation
,
sortings
2100
x4474
1365E
Maximum Subsequence Value
brute force
,
constructive algorithms
1900
x7892
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x17594
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x1438
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4442
1364C
Ehab and Prefix MEXs
brute force
,
constructive algorithms
,
greedy
1600
x13244
1363F
Rotating Substrings
dp
,
strings
2600
x1537
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6869
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x4102
1363C
Game On Leaves
games
,
trees
1600
x18946
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x154
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x703
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x322
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1652
1361B
Johnny and Grandmaster
greedy
,
implementation
,
math
,
sortings
1900
x3674
1361A
Johnny and Contribution
constructive algorithms
,
graphs
,
greedy
,
sortings
1700
x8461
1360H
Binary Median
binary search
,
bitmasks
,
brute force
,
constructive algorithms
2100
x4609
1360G
A/B Matrix
constructive algorithms
,
greedy
,
math
1900
x7857
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x12528
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x544
1359E
Modular Stability
combinatorics
,
math
,
number theory
2000
x6164
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x9572
1359C
Mixing Water
binary search
,
math
1700
x13936
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x460
1358E
Are You Fired?
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x2339
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8233
1358C
Celex Update
math
1600
x17467
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x875
1355E
Restorer Distance
binary search
,
greedy
,
math
,
sortings
,
ternary search
2100
x5210
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10746
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x799
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x1237
1354E
Graph Coloring
dfs and similar
,
dp
,
graphs
2100
x3386
1354D
Multiset
binary search
,
data structures
1900
x8914
1354C2
Not So Simple Polygon Embedding
binary search
,
brute force
,
geometry
,
math
2000
x6112
1353F
Decreasing Heights
brute force
,
dp
2200
x3367
1353E
K-periodic Garland
brute force
,
dp
,
greedy
1900
x7216
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x18261
1352G
Special Permutation
constructive algorithms
1600
x21578
1349F2
Slime and Sequences (Hard Version)
dp
,
fft
,
math
3500
x115
1349F1
Slime and Sequences (Easy Version)
dp
,
fft
,
math
3100
x421
1349E
Slime and Hats
constructive algorithms
,
dp
,
greedy
3500
x92
1349D
Slime and Biscuits
math
,
probabilities
3200
x925
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4549
1349B
Orac and Medians
constructive algorithms
,
greedy
,
math
2000
x8211
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x17341
1348F
Phoenix and Memory
data structures
,
dfs and similar
,
graphs
,
greedy
2600
x822
1348E
Phoenix and Berries
brute force
,
dp
,
greedy
,
math
2400
x2250
1348D
Phoenix and Science
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x8919
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14694
1346I
Pac-Man 2.0
*special problem
,
dp
2900
x49
1346H
Game with Segments
*special problem
,
data structures
,
games
2700
x50
1346G
Two IP Cameras
*special problem
,
math
,
number theory
2300
x135
1346F
Dune II: Battle For Arrakis
*special problem
,
data structures
,
greedy
,
math
2000
x228
1346E
Magic Tricks
*special problem
,
dp
,
graphs
1700
x380
1346D
Constructing the Dungeon
*special problem
,
graphs
,
greedy
1600
x507
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x608
1344F
Piet's Palette
matrices
3200
x455
1344E
Train Tracks
data structures
,
trees
3100
x463
1344D
Résumé Review
binary search
,
greedy
,
math
2700
x1173
1344C
Quantifier Question
dfs and similar
,
dp
,
graphs
,
math
2600
x1873
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x6089
1344A
Hilbert's Hotel
math
,
number theory
,
sortings
1600
x15706
1343F
Restore the Permutation by Sorted Segments
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1273
1343E
Weights Distributing
brute force
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x5232
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12769
1342F
Make It Ascending
bitmasks
,
brute force
,
dp
3000
x768
1342E
Placing Rooks
combinatorics
,
fft
,
math
2300
x3125
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x6134
1342C
Yet Another Counting Problem
math
,
number theory
1600
x14110
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x511
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x53
1340D
Nastya and Time Machine
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2600
x995
1340C
Nastya and Unexpected Guest
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x2263
1340B
Nastya and Scoreboard
bitmasks
,
dp
,
graphs
,
greedy
1700
x7879
1338E
JYPnation
graphs
3500
x247
1338D
Nested Rubber Bands
constructive algorithms
,
dfs and similar
,
dp
,
math
,
trees
2700
x1029
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x3246
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8523
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x222
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x308
1336E1
Chiori and Doll Picking (easy version)
bitmasks
,
brute force
,
combinatorics
,
math
2700
x691
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x478
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3627
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x11420
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x20640
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x2202
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x8390
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10901
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