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Codeforces Round 940 (Div. 2) and CodeCraft-23
3 days
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Difficulty:
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data structures
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
1703B
ICPC Balloons
data structures
,
implementation
800
x44831
1760C
Advantage
data structures
,
implementation
,
sortings
800
x34723
1722C
Word Game
data structures
,
implementation
800
x29225
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x29174
1690C
Restoring the Duration of Tasks
data structures
,
greedy
,
implementation
800
x25317
1497A
Meximization
brute force
,
data structures
,
greedy
,
sortings
800
x23806
1730A
Planets
data structures
,
greedy
,
sortings
800
x22462
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20710
1200A
Hotelier
brute force
,
data structures
,
implementation
800
x19880
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x19533
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x15843
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11319
1807D
Odd Queries
data structures
,
implementation
900
x28290
1380A
Three Indices
brute force
,
data structures
900
x22953
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x21842
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x21765
1689B
Mystic Permutation
data structures
,
greedy
900
x17066
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x23238
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x22921
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22219
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x20884
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20478
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x20125
1438B
Valerii Against Everyone
constructive algorithms
,
data structures
,
greedy
,
sortings
1000
x18313
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15813
368B
Sereja and Suffixes
data structures
,
dp
1100
x39314
519B
A and B and Compilation Errors
data structures
,
implementation
,
sortings
1100
x37533
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x26769
1213B
Bad Prices
data structures
,
implementation
1100
x25497
1703D
Double Strings
brute force
,
data structures
,
strings
1100
x24155
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x22783
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x21998
1702C
Train and Queries
data structures
,
greedy
1100
x21380
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x20971
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20332
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19746
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x19583
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x19490
767A
Snacktower
data structures
,
implementation
1100
x19125
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19095
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x19057
1492B
Card Deck
data structures
,
greedy
,
math
1100
x18065
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17720
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17540
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x15526
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x13739
427B
Prison Transfer
data structures
,
implementation
1100
x13667
755B
PolandBall and Game
binary search
,
data structures
,
games
,
greedy
,
sortings
,
strings
1100
x10901
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8634
834B
The Festive Evening
data structures
,
implementation
1100
x8500
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4186
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42217
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26685
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x21593
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21547
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x20096
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x19957
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19051
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x17976
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x17931
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x17809
1679B
Stone Age Problem
data structures
,
implementation
1200
x16825
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x16761
1730C
Minimum Notation
data structures
,
greedy
,
math
,
sortings
1200
x15987
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x14927
1104B
Game with string
data structures
,
implementation
,
math
1200
x14388
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14199
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x13832
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x13218
1214C
Bad Sequence
data structures
,
greedy
1200
x12800
18C
Stripe
data structures
,
implementation
1200
x12403
879B
Table Tennis
data structures
,
implementation
1200
x11820
701B
Cells Not Under Attack
data structures
,
math
1200
x11553
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x10888
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10578
4C
Registration System
data structures
,
hashing
,
implementation
1300
x76455
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x27200
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x26805
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x19799
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x18115
1703F
Yet Another Problem About Pairs Satisfying an Inequality
binary search
,
data structures
,
dp
,
greedy
,
sortings
1300
x17972
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x17902
1698C
3SUM Closure
brute force
,
data structures
1300
x17819
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16421
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x15987
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15699
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x14582
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14424
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14324
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12281
1007A
Reorder the Array
combinatorics
,
data structures
,
math
,
sortings
,
two pointers
1300
x11966
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x11832
1100B
Build a Contest
data structures
,
implementation
1300
x10874
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x10652
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10472
777B
Game of Credit Cards
data structures
,
dp
,
greedy
,
sortings
1300
x9325
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8138
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x7768
572B
Order Book
data structures
,
greedy
,
implementation
,
sortings
1300
x6725
808B
Average Sleep Time
data structures
,
implementation
,
math
1300
x6544
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