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Codeforces Round 953 (Div. 2)
11:10:43
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Difficulty:
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brute force
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
815A
Karen and Game
brute force
,
greedy
,
implementation
1700
x5581
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6353
813B
The Golden Age
brute force
,
math
1800
x3840
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5094
811A
Vladik and Courtesy
brute force
,
implementation
800
x11806
807B
T-Shirt Hunt
brute force
,
implementation
1300
x3529
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1260
801A
Vicious Keyboard
brute force
1100
x7233
799D
Field expansion
brute force
,
dp
,
meet-in-the-middle
2100
x1978
799A
Carrot Cakes
brute force
,
implementation
1100
x18148
798B
Mike and strings
brute force
,
dp
,
strings
1300
x8289
798A
Mike and palindrome
brute force
,
constructive algorithms
,
strings
1000
x21151
797E
Array Queries
brute force
,
data structures
,
dp
2000
x4119
796A
Buying A House
brute force
,
implementation
800
x12868
794A
Bank Robbery
brute force
,
implementation
800
x6939
789B
Masha and geometric depression
brute force
,
implementation
,
math
1700
x4354
787A
The Monster
brute force
,
math
,
number theory
1200
x11095
785E
Anton and Permutation
brute force
,
data structures
2200
x1831
784E
Twisted Circuit
*special problem
,
brute force
,
implementation
2000
x1893
779B
Weird Rounding
brute force
,
greedy
1100
x10228
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x867
778B
Bitwise Formula
bitmasks
,
brute force
,
dfs and similar
,
expression parsing
,
implementation
1800
x2272
777E
Hanoi Factory
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3899
776C
Molly's Chemicals
binary search
,
brute force
,
data structures
,
implementation
,
math
1800
x5807
776A
A Serial Killer
brute force
,
implementation
,
strings
900
x11885
773B
Dynamic Problem Scoring
brute force
,
greedy
2000
x1145
769D
k-Interesting Pairs Of Integers
*special problem
,
bitmasks
,
brute force
,
meet-in-the-middle
1700
x2220
768F
Barrels and boxes
brute force
,
combinatorics
,
math
,
number theory
,
probabilities
2300
x1003
768C
Jon Snow and his Favourite Number
brute force
,
dp
,
implementation
,
sortings
1800
x3774
767B
The Queue
brute force
,
greedy
2100
x2112
766C
Mahmoud and a Message
brute force
,
dp
,
greedy
,
strings
1700
x4339
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x82
764A
Taymyr is calling you
brute force
,
implementation
,
math
800
x16077
763C
Timofey and remoduling
brute force
,
implementation
,
math
,
number theory
2600
x706
761F
Dasha and Photos
brute force
,
data structures
,
dp
,
implementation
2600
x408
761D
Dasha and Very Difficult Problem
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
1700
x3948
761C
Dasha and Password
brute force
,
dp
,
implementation
1500
x5848
761B
Dasha and friends
brute force
,
implementation
,
math
1300
x6815
761A
Dasha and Stairs
brute force
,
constructive algorithms
,
implementation
,
math
1000
x14365
758F
Geometrical Progression
brute force
,
math
,
number theory
2400
x621
758B
Blown Garland
brute force
,
implementation
,
number theory
1100
x10089
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1272
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x983
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17621
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x485
754C
Vladik and chat
brute force
,
constructive algorithms
,
dp
,
implementation
,
strings
2200
x915
754B
Ilya and tic-tac-toe game
brute force
,
implementation
1100
x7180
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x286
753B
Interactive Bulls and Cows (Easy)
brute force
,
constructive algorithms
,
implementation
1600
x1176
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x442
750D
New Year and Fireworks
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
1900
x3065
750A
New Year and Hurry
binary search
,
brute force
,
implementation
,
math
800
x71992
749B
Parallelogram is Back
brute force
,
constructive algorithms
,
geometry
1200
x8424
747F
Igor and Interesting Numbers
brute force
,
combinatorics
,
dp
,
math
2500
x413
747A
Display Size
brute force
,
math
800
x10065
744C
Hongcow Buys a Deck of Cards
bitmasks
,
brute force
,
dp
2400
x1015
743E
Vladik and cards
binary search
,
bitmasks
,
brute force
,
dp
2200
x1483
743C
Vladik and fractions
brute force
,
constructive algorithms
,
math
,
number theory
1500
x11968
742B
Arpa’s obvious problem and Mehrdad’s terrible solution
brute force
,
math
,
number theory
1500
x9109
740A
Alyona and copybooks
brute force
,
implementation
1300
x8829
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2077
734B
Anton and Digits
brute force
,
greedy
,
implementation
,
math
800
x28685
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x68472
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2768
731D
80-th Level Archeology
brute force
,
data structures
,
greedy
,
sortings
2200
x1157
727A
Transformation: from A to B
brute force
,
dfs and similar
,
math
1000
x13388
725E
Too Much Money
brute force
,
greedy
2600
x643
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2608
724B
Batch Sort
brute force
,
greedy
,
implementation
,
math
1500
x3984
722A
Broken Clock
brute force
,
implementation
1300
x6599
711A
Bus to Udayland
brute force
,
implementation
800
x28924
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1706
710B
Optimal Point on a Line
brute force
,
sortings
1400
x8605
706A
Beru-taxi
brute force
,
geometry
,
implementation
900
x14322
704A
Thor
brute force
,
data structures
,
implementation
1600
x9011
702B
Powers of Two
brute force
,
data structures
,
implementation
,
math
1500
x11402
698D
Limak and Shooting Points
brute force
,
geometry
,
math
2600
x512
697B
Barnicle
brute force
,
implementation
,
math
,
strings
1400
x5680
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x6002
691F
Couple Cover
brute force
,
dp
,
number theory
2200
x1254
689A
Mike and Cellphone
brute force
,
constructive algorithms
,
implementation
1400
x5202
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x856
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x505
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x478
685A
Robbers' watch
brute force
,
combinatorics
,
dp
,
math
1700
x4156
681B
Economy Game
brute force
1300
x8791
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x312
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x586
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7317
670F
Restore a Number
brute force
,
constructive algorithms
,
strings
2300
x848
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x16418
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x16530
666D
Chain Reaction
brute force
,
geometry
3000
x273
665B
Shopping
brute force
1400
x3493
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x134
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1965
653C
Bear and Up-Down
brute force
,
implementation
1900
x1629
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4905
653A
Bear and Three Balls
brute force
,
implementation
,
sortings
900
x8050
650B
Image Preview
binary search
,
brute force
,
dp
,
two pointers
1900
x3312
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