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Before contest
Codeforces Round 941 (Div. 1)
05:53:51
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
05:53:51
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combine-tags-by-or
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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
1039E
Summer Oenothera Exhibition
data structures
3400
x263
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x249
1239F
Swiper, no swiping!
graphs
,
implementation
3400
x245
1572F
Stations
data structures
3400
x236
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x235
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x231
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x226
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x224
1268E
Happy Cactus
dp
3400
x219
1103E
Radix sum
fft
,
math
,
number theory
3400
x214
1098E
Fedya the Potter
binary search
,
implementation
,
math
,
number theory
3400
x211
833E
Caramel Clouds
data structures
,
dp
,
sortings
3400
x210
1010F
Tree
fft
,
graphs
,
trees
3400
x209
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x200
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x195
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x184
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x180
1242D
Number Discovery
math
3400
x175
739D
Recover a functional graph
graph matchings
3400
x175
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x174
1784F
Minimums or Medians
3400
x169
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x167
1764H
Doremy's Paint 2
data structures
3400
x162
1007E
Mini Metro
dp
3400
x158
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x157
1012F
Passports
dp
,
implementation
3400
x152
1770G
Koxia and Bracket
divide and conquer
,
fft
,
math
3400
x150
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x148
1299E
So Mean
interactive
,
math
3400
x148
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x147
1530H
Turing's Award
data structures
,
dp
3400
x140
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x137
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
1060G
Balls and Pockets
data structures
3400
x134
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x129
1442F
Differentiating Games
games
,
interactive
3400
x127
913H
Don't Exceed
math
,
probabilities
3400
x123
1552I
Organizing a Music Festival
dfs and similar
,
math
3400
x121
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x121
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x121
1887F
Minimum Segments
constructive algorithms
3400
x112
1023G
Pisces
data structures
,
flows
,
trees
3400
x112
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x105
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x99
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x93
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x92
1045F
Shady Lady
geometry
,
math
3400
x92
756F
Long number
expression parsing
,
math
,
number theory
3400
x89
1190F
Tokitsukaze and Powers
number theory
,
probabilities
3400
x87
1078E
Negative Time Summation
constructive algorithms
3400
x86
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x77
1310F
Bad Cryptography
math
,
number theory
3400
x67
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x64
853E
Lada Malina
data structures
,
geometry
3400
x64
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x56
1220G
Geolocation
geometry
3400
x48
1431J
Zero-XOR Array
*special problem
,
dp
3400
x42
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x938
1264F
Beautiful Fibonacci Problem
constructive algorithms
,
number theory
3500
x833
1707E
Replace
binary search
,
data structures
3500
x557
1034D
Intervals of Intervals
binary search
,
data structures
,
two pointers
3500
x431
799F
Beautiful fountains rows
data structures
3500
x417
1158F
Density of subarrays
dp
,
math
3500
x391
1267C
Cactus Revenge
constructive algorithms
3500
x378
1033G
Chip Game
games
3500
x354
1290F
Making Shapes
dp
3500
x352
1500F
Cupboards Jumps
dp
3500
x328
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x327
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x300
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x299
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x285
1464F
My Beautiful Madness
data structures
,
trees
3500
x273
1110H
Modest Substrings
dp
,
strings
3500
x273
1456E
XOR-ranges
dp
,
greedy
3500
x268
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x266
1458F
Range Diameter Sum
data structures
,
trees
3500
x258
1148H
Holy Diver
data structures
3500
x238
1147F
Zigzag Game
games
,
interactive
3500
x237
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x236
1523H
Hopping Around the Array
data structures
,
dp
3500
x234
1450G
Communism
bitmasks
,
dp
,
trees
3500
x231
1338E
JYPnation
graphs
3500
x228
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x227
1830E
Bully Sort
data structures
,
math
3500
x225
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x225
1086F
Forest Fires
math
3500
x223
1368H2
Breadboard Capacity (hard version)
3500
x218
1098F
Ж-function
string suffix structures
,
strings
3500
x217
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x214
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x213
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x212
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x211
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x206
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x201
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x194
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x193
1053E
Euler tour
constructive algorithms
,
trees
3500
x193
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x187
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