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Before contest
Codeforces Round 945 (Div. 2)
41:46:40
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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
1488I
Demonic Invasion
*special problem
,
flows
3100
x33
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x53
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x117
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x167
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x205
1488D
Problemsolving Marathon
*special problem
,
binary search
,
greedy
1900
x330
1488C
Two Policemen
*special problem
,
binary search
,
brute force
,
math
1900
x399
1488B
RBS Deletion
*special problem
,
greedy
1800
x539
1488A
From Zero To Y
*special problem
,
math
900
x1340
1431J
Zero-XOR Array
*special problem
,
dp
3400
x42
1431I
Cyclic Shifts
*special problem
,
strings
2900
x42
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x64
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x138
1431F
Neural Network Problem
*special problem
,
binary search
,
greedy
2100
x153
1431E
Chess Match
*special problem
2000
x218
1431D
Used Markers
*special problem
,
greedy
1500
x447
1431C
Black Friday
*special problem
,
implementation
1600
x697
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x1000
1431A
Selling Hamburgers
*special problem
800
x1789
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x286
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x198
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x103
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1143
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x125
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x804
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x1327
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x672
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x430
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x118
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x251
1356D2
Quantum Classification - 2
*special problem
x122
1356D1
Quantum Classification - 1
*special problem
x132
1356C
Prepare state |01⟩ + |10⟩ + |11⟩
*special problem
x298
1356B2
Decrement
*special problem
x278
1356B1
Increment
*special problem
x278
1356A5
Distinguish Z from -Z
*special problem
x326
1356A4
Distinguish I ⊗ X from CNOT
*special problem
x454
1356A3
Distinguish Z from S
*special problem
x456
1356A2
Distinguish I from Z
*special problem
x483
1356A1
Distinguish I from X
*special problem
x598
1346I
Pac-Man 2.0
*special problem
,
dp
2900
x43
1346H
Game with Segments
*special problem
,
data structures
,
games
2700
x46
1346G
Two IP Cameras
*special problem
,
math
,
number theory
2300
x131
1346F
Dune II: Battle For Arrakis
*special problem
,
data structures
,
greedy
,
math
2000
x219
1346E
Magic Tricks
*special problem
,
dp
,
graphs
1700
x369
1346D
Constructing the Dungeon
*special problem
,
graphs
,
greedy
1600
x478
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x581
1346B
Boot Camp
*special problem
,
greedy
1400
x1181
1346A
Color Revolution
*special problem
,
math
1000
x1943
1331H
It's showtime
*special problem
x619
1331G
Lingua Romana
*special problem
x488
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x554
1331E
Jordan Smiley
*special problem
,
dfs and similar
,
geometry
,
implementation
x1200
1331D
Again?
*special problem
,
implementation
x11858
1331C
...And after happily lived ever they
*special problem
,
bitmasks
x3134
1331B
Limericks
*special problem
,
math
,
number theory
x6977
1331A
Is it rated?
*special problem
x17004
1297I
Falling Blocks
*special problem
,
data structures
x27
1297H
Paint the String
*special problem
,
dp
,
strings
x40
1297G
M-numbers
*special problem
,
dp
,
math
x65
1297F
Movie Fan
*special problem
,
data structures
,
greedy
,
implementation
,
sortings
x113
1297E
Modernization of Treeland
*special problem
,
dfs and similar
,
trees
x199
1297D
Bonus Distribution
*special problem
,
binary search
,
greedy
,
sortings
x259
1297C
Dream Team
*special problem
,
greedy
x396
1297B
Cartoons
*special problem
,
implementation
,
sortings
x409
1297A
Likes Display
*special problem
,
implementation
x925
1275F
Шардирование постов
*special problem
,
binary search
,
interactive
x91
1275E3
Контрольная сумма
*special problem
x56
1275E2
Контрольная сумма
*special problem
x130
1275E1
Контрольная сумма
*special problem
x254
1275D
Storage2
*special problem
x421
1275C
#define Задача B ...
*special problem
x668
1275B
Code Review
*special problem
x818
1275A
Скрытый друг
*special problem
x885
1211I
Unusual Graph
*special problem
,
graphs
3000
x34
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x41
1211G
King's Path
*special problem
,
math
,
trees
2500
x66
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x118
1211E
Double Permutation Inc.
*special problem
,
binary search
,
greedy
2000
x188
1211D
Teams
*special problem
,
binary search
,
greedy
,
math
2000
x224
1211C
Ice Cream
*special problem
,
greedy
,
sortings
1700
x478
1211B
Traveling Around the Golden Ring of Berland
*special problem
,
implementation
1500
x754
1211A
Three Problems
*special problem
,
implementation
1000
x1275
1193C
Scissors and Tape
*special problem
,
constructive algorithms
,
geometry
x35
1193B
Magic Tree
*special problem
,
data structures
,
dp
,
trees
x417
1193A
Amusement Park
*special problem
,
dp
,
math
x238
1192C
Cubeword
*special problem
,
brute force
,
dp
,
meet-in-the-middle
x322
1192B
Dynamic Diameter
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
trees
x1004
1192A
Building Skyscrapers
*special problem
x59
1170I
Good Subsets
*special problem
,
dp
x35
1170H
Longest Saw
*special problem
,
constructive algorithms
x43
1170G
Graph Decomposition
*special problem
,
graphs
x68
1170F
Wheels
*special problem
,
binary search
,
greedy
x115
1170E
Sliding Doors
*special problem
,
binary search
x254
1170D
Decoding of Integer Sequences
*special problem
,
data structures
,
implementation
x417
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x775
1170B
Bad Days
*special problem
,
implementation
x1060
1170A
Three Integers Again
*special problem
,
math
x1433
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