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Codeforces Round 950 (Div. 3)
2 days
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Difficulty:
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math
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
#
Name
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x1005
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2117
724B
Batch Sort
brute force
,
greedy
,
implementation
,
math
1500
x3982
723A
The New Year: Meeting Friends
implementation
,
math
,
sortings
800
x71801
721D
Maxim and Array
constructive algorithms
,
data structures
,
greedy
,
math
2000
x2300
721B
Passwords
implementation
,
math
,
sortings
,
strings
1100
x11992
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x3399
718A
Efim and Strange Grade
dp
,
implementation
,
math
1700
x4326
717H
Pokermon League challenge
math
,
probabilities
2400
x418
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x336
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x347
715A
Plus and Square Root
constructive algorithms
,
math
1600
x5552
714A
Meeting of Old Friends
implementation
,
math
1100
x10692
712E
Memory and Casinos
data structures
,
math
,
probabilities
2500
x605
712D
Memory and Scores
combinatorics
,
dp
,
math
2200
x1659
712C
Memory and De-Evolution
greedy
,
math
1600
x5586
712A
Memory and Crow
implementation
,
math
800
x11530
711E
ZS and The Birthday Paradox
math
,
number theory
,
probabilities
2300
x1246
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4370
710D
Two Arithmetic Progressions
math
,
number theory
2500
x1169
710C
Magic Odd Square
constructive algorithms
,
math
1500
x4998
708E
Student's Camp
dp
,
math
3100
x940
708B
Recover the String
constructive algorithms
,
greedy
,
implementation
,
math
1900
x3208
707C
Pythagorean Triples
math
,
number theory
1500
x12325
705B
Spider Man
games
,
math
1100
x9056
704C
Black Widow
dp
,
graphs
,
implementation
,
math
2900
x458
703B
Mishka and trip
implementation
,
math
1400
x5638
702D
Road to Post Office
math
1900
x3253
702B
Powers of Two
brute force
,
data structures
,
implementation
,
math
1500
x11343
701B
Cells Not Under Attack
data structures
,
math
1200
x11590
700A
As Fast As Possible
binary search
,
math
1900
x3148
698D
Limak and Shooting Points
brute force
,
geometry
,
math
2600
x510
698C
LRU
bitmasks
,
dp
,
math
,
probabilities
2400
x1283
697B
Barnicle
brute force
,
implementation
,
math
,
strings
1400
x5672
697A
Pineapple Incident
implementation
,
math
900
x12610
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2054
696B
Puzzles
dfs and similar
,
math
,
probabilities
,
trees
1700
x3396
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5320
689C
Mike and Chocolate Thieves
binary search
,
combinatorics
,
math
1700
x4939
688B
Lovely Palindromes
constructive algorithms
,
math
1000
x30699
687B
Remainders Game
chinese remainder theorem
,
math
,
number theory
1800
x5596
685C
Optimal Point
binary search
,
math
2900
x577
685A
Robbers' watch
brute force
,
combinatorics
,
dp
,
math
1700
x4149
683D
Chocolate Bar
*special problem
,
math
1400
x319
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20682
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x312
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x12444
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x1915
678D
Iterated Linear Function
math
,
number theory
1700
x4307
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x9118
678A
Johny Likes Numbers
implementation
,
math
800
x12611
677B
Vanya and Food Processor
implementation
,
math
1400
x7541
676E
The Last Fight Between Human and AI
math
2400
x885
676B
Pyramid of Glasses
implementation
,
math
,
math
1500
x5464
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7306
675A
Infinite Sequence
math
1100
x14778
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x16488
669A
Little Artem and Presents
math
800
x10574
667A
Pouring Rain
geometry
,
math
1100
x7795
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x579
664A
Complicated GCD
math
,
number theory
800
x17519
663A
Rebus
constructive algorithms
,
expression parsing
,
greedy
,
math
1800
x3261
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1618
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1964
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x430
660E
Different Subsets For All Tuples
combinatorics
,
math
2300
x1245
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x8581
659D
Bicycle Race
geometry
,
implementation
,
math
1500
x6156
659A
Round House
implementation
,
math
1000
x15404
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x517
652F
Ants on a Circle
constructive algorithms
,
math
2800
x521
652A
Gabriel and Caterpillar
implementation
,
math
1400
x4570
651A
Joysticks
dp
,
greedy
,
implementation
,
math
1100
x22552
650A
Watchmen
data structures
,
geometry
,
math
1400
x15101
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x761
645B
Mischievous Mess Makers
greedy
,
math
1200
x3335
643F
Bears and Juice
dp
,
math
,
meet-in-the-middle
2900
x677
643E
Bear and Destroying Subtrees
dp
,
math
,
probabilities
,
trees
2700
x582
641D
Little Artem and Random Variable
dp
,
implementation
,
math
,
probabilities
2400
x1048
639E
Bear and Paradox
binary search
,
greedy
,
math
,
sortings
2800
x569
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1189
638A
Home Numbers
*special problem
,
constructive algorithms
,
math
1100
x3765
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x730
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2570
633B
A Trivial Problem
brute force
,
constructive algorithms
,
math
,
number theory
1300
x6557
633A
Ebony and Ivory
brute force
,
math
,
number theory
1100
x12393
632E
Thief in a Shop
divide and conquer
,
dp
,
fft
,
math
2400
x2596
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x3448
630R
Game
games
,
math
1200
x8340
630Q
Pyramids
geometry
,
math
1700
x1217
630N
Forecast
math
1300
x4525
630M
Turn
geometry
,
math
1800
x1100
630L
Cracking the Code
implementation
,
math
1400
x3458
630K
Indivisibility
math
,
number theory
1500
x5068
630J
Divisibility
math
,
number theory
1100
x10733
630I
Parking Lot
combinatorics
,
math
1700
x6347
630H
Benches
combinatorics
,
math
1400
x4757
630G
Challenge Pennants
combinatorics
,
math
1600
x2654
630F
Selection of Personnel
combinatorics
,
math
1300
x6603
630E
A rectangle
math
1900
x2264
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