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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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number theory
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
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number theory
probabilities
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shortest paths
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ternary search
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Problems
#
Name
122A
Lucky Division
brute force
,
number theory
1000
x115288
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x69395
630A
Again Twenty Five!
number theory
800
x61323
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x56705
1475A
Odd Divisor
math
,
number theory
900
x54621
313A
Ilya and Bank Account
implementation
,
number theory
900
x53263
1370A
Maximum GCD
greedy
,
implementation
,
math
,
number theory
800
x48451
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x46215
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x42610
742A
Arpa’s hard exam and Mehrdad’s naive cheat
implementation
,
math
,
number theory
1000
x39613
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x38150
1325A
EhAb AnD gCd
constructive algorithms
,
greedy
,
number theory
800
x37914
577A
Multiplication Table
implementation
,
number theory
1000
x37881
1899A
Game with Integers
games
,
math
,
number theory
800
x36966
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x35159
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x32055
822A
I'm bored with life
implementation
,
math
,
number theory
800
x31558
1549A
Gregor and Cryptography
math
,
number theory
800
x31196
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x30849
1360D
Buying Shovels
math
,
number theory
1300
x30569
1553A
Digits Sum
math
,
number theory
800
x30030
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x29529
1535B
Array Reodering
brute force
,
greedy
,
math
,
number theory
,
sortings
900
x29481
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x29383
1326A
Bad Ugly Numbers
constructive algorithms
,
number theory
1000
x29301
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x28933
1526B
I Hate 1111
dp
,
math
,
number theory
1400
x28450
26A
Almost Prime
number theory
900
x28294
1768A
Greatest Convex
greedy
,
math
,
number theory
800
x27854
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26688
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x26646
1541B
Pleasant Pairs
brute force
,
implementation
,
math
,
number theory
1200
x26314
1543A
Exciting Bets
greedy
,
math
,
number theory
900
x26211
1474B
Different Divisors
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1000
x26152
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x25988
1455A
Strange Functions
math
,
number theory
800
x25967
1312A
Two Regular Polygons
geometry
,
greedy
,
math
,
number theory
800
x25237
1324A
Yet Another Tetris Problem
implementation
,
number theory
900
x25195
1525A
Potion-making
math
,
number theory
800
x25030
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x24946
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24512
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24370
1471A
Strange Partition
greedy
,
math
,
number theory
900
x24349
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x24298
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x24060
1514A
Perfectly Imperfect Array
math
,
number theory
800
x23751
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x23456
1370C
Number Game
games
,
math
,
number theory
1400
x23451
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x23361
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23352
1238A
Prime Subtraction
math
,
number theory
900
x23170
1370B
GCD Compression
constructive algorithms
,
math
,
number theory
1100
x23031
1629B
GCD Arrays
greedy
,
math
,
number theory
800
x22922
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x22692
1108B
Divisors of Two Integers
brute force
,
greedy
,
math
,
number theory
1100
x22295
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22283
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x22092
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x21921
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x21899
1285C
Fadi and LCM
brute force
,
math
,
number theory
1400
x21863
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x21805
1872C
Non-coprime Split
math
,
number theory
1100
x21785
1720A
Burenka Plays with Fractions
math
,
number theory
900
x21641
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x21621
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x21354
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21200
1485A
Add and Divide
brute force
,
greedy
,
math
,
number theory
1000
x20683
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x20670
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x20655
1350B
Orac and Models
dp
,
math
,
number theory
1400
x20461
1828B
Permutation Swap
math
,
number theory
900
x20391
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20359
1605A
A.M. Deviation
math
,
number theory
800
x20304
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20058
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x19651
1740A
Factorise N+M
constructive algorithms
,
number theory
800
x19542
1487B
Cat Cycle
math
,
number theory
1200
x19523
1593D1
All are Same
math
,
number theory
1100
x19511
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19300
776B
Sherlock and his girlfriend
constructive algorithms
,
number theory
1200
x19193
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19136
1717A
Madoka and Strange Thoughts
math
,
number theory
800
x19085
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x18948
1945B
Fireworks
math
,
number theory
900
x18741
1762A
Divide and Conquer
greedy
,
math
,
number theory
800
x18487
1656C
Make Equal With Mod
constructive algorithms
,
math
,
number theory
,
sortings
1200
x18417
1658B
Marin and Anti-coprime Permutation
combinatorics
,
math
,
number theory
800
x18330
1538F
Interesting Function
binary search
,
dp
,
math
,
number theory
1500
x18233
1932B
Chaya Calendar
number theory
1100
x18002
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x17990
762A
k-th divisor
math
,
number theory
1400
x17837
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x17825
1411B
Fair Numbers
brute force
,
number theory
1000
x17653
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17485
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17353
664A
Complicated GCD
math
,
number theory
800
x17318
1736B
Playing with GCD
math
,
number theory
1200
x17166
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17097
1332B
Composite Coloring
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1400
x16996
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x16927
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