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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
13:37:25
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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
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
1000C
Covered Points Count
data structures
,
implementation
,
sortings
1700
x6900
1000B
Light It Up
greedy
1500
x5919
1000A
Codehorses T-shirts
greedy
,
implementation
1200
x8859
999F
Cards and Joy
dp
2000
x2759
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6784
999D
Equalize the Remainders
data structures
,
greedy
,
implementation
1900
x4439
999C
Alphabetic Removals
implementation
1200
x18605
999B
Reversing Encryption
implementation
900
x17973
999A
Mishka and Contest
brute force
,
implementation
800
x23258
998B
Cutting
dp
,
greedy
,
sortings
1200
x13244
998A
Balloons
constructive algorithms
,
implementation
1000
x9659
997E
Good Subsegments
data structures
3000
x1317
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x465
997C
Sky Full of Stars
combinatorics
,
math
2500
x1749
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x2991
997A
Convert to Ones
brute force
,
greedy
,
implementation
,
math
1500
x8349
996B
World Cup
binary search
,
math
1300
x9114
996A
Hit the Lottery
dp
,
greedy
800
x94284
995F
Cowmpany Cowmpensation
combinatorics
,
dp
,
math
,
trees
2700
x1278
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x699
995D
Game
math
2500
x769
995C
Leaving the Bar
brute force
,
data structures
,
geometry
,
greedy
,
math
,
sortings
2300
x1911
995B
Suit and Tie
greedy
,
implementation
,
math
1400
x7127
995A
Tesla
constructive algorithms
,
implementation
2100
x1705
994B
Knights of a Polygonal Table
greedy
,
implementation
,
sortings
1400
x5753
994A
Fingerprints
implementation
800
x14287
993F
The Moral Dilemma
3200
x60
993E
Nikita and Order Statistics
chinese remainder theorem
,
fft
,
math
2300
x1448
993D
Compute Power
binary search
,
dp
,
greedy
2500
x755
993C
Careful Maneuvering
bitmasks
,
brute force
,
geometry
2100
x1715
993B
Open Communication
bitmasks
,
brute force
1900
x1965
993A
Two Squares
geometry
,
implementation
1600
x4171
992E
Nastya and King-Shamans
binary search
,
data structures
2500
x1470
992D
Nastya and a Game
brute force
,
implementation
,
math
2100
x1663
992C
Nastya and a Wardrobe
math
1600
x4626
992B
Nastya Studies Informatics
math
,
number theory
1600
x6316
992A
Nastya and an Array
implementation
,
sortings
800
x13307
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x310
991E
Bus Number
brute force
,
combinatorics
,
math
1800
x3521
991D
Bishwock
dp
,
greedy
1500
x7242
991C
Candies
binary search
,
implementation
1500
x10606
991B
Getting an A
greedy
,
sortings
900
x12731
991A
If at first you don't succeed...
implementation
1000
x10669
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1907
990F
Flow Control
dfs and similar
,
dp
,
greedy
,
trees
2400
x918
990E
Post Lamps
brute force
,
greedy
2100
x2047
990D
Graph And Its Complement
constructive algorithms
,
graphs
,
implementation
1700
x3867
990C
Bracket Sequences Concatenation Problem
implementation
1500
x5962
990B
Micro-World
greedy
,
sortings
1200
x8180
990A
Commentary Boxes
implementation
,
math
1000
x10679
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x253
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x517
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3834
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x7074
989A
A Blend of Springtime
implementation
,
strings
900
x10431
988F
Rain and Umbrellas
dp
2100
x2363
988E
Divisibility by 25
brute force
,
greedy
2100
x4033
988D
Points and Powers of Two
brute force
,
math
1800
x7393
988C
Equal Sums
implementation
,
sortings
1400
x10320
988B
Substrings Sort
sortings
,
strings
1100
x18760
988A
Diverse Team
brute force
,
implementation
800
x25492
987C
Three displays
brute force
,
dp
,
implementation
1400
x13672
987B
High School: Become Human
math
1100
x11681
987A
Infinity Gauntlet
implementation
800
x16741
986F
Oppa Funcan Style Remastered
graphs
,
math
,
number theory
,
shortest paths
3300
x645
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x802
986D
Perfect Encoding
fft
,
math
3100
x332
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2484
986B
Petr and Permutations
combinatorics
,
math
1800
x4729
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x7062
985G
Team Players
combinatorics
2700
x541
985F
Isomorphic Strings
hashing
,
strings
2300
x1882
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3709
985D
Sand Fortress
binary search
,
constructive algorithms
,
math
2100
x2579
985C
Liebig's Barrels
greedy
1500
x5797
985B
Switches and Lamps
implementation
1200
x7473
985A
Chess Placing
implementation
1100
x8203
984B
Minesweeper
implementation
1100
x7431
984A
Game
sortings
800
x19627
983E
NN country
binary search
,
data structures
,
trees
2800
x974
983D
Arkady and Rectangles
data structures
3300
x408
983C
Elevator
dp
,
graphs
,
shortest paths
2400
x843
983B
XOR-pyramid
dp
1800
x5599
983A
Finite or not?
implementation
,
math
1700
x4563
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x198
982E
Billiard
geometry
,
number theory
2600
x724
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2350
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x11829
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8393
982A
Row
brute force
,
constructive algorithms
1200
x9123
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x272
981G
Magic multisets
data structures
2500
x696
981F
Round Marriage
binary search
,
graph matchings
,
greedy
2500
x791
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x2159
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3283
981C
Useful Decomposition
implementation
,
trees
1400
x5513
981B
Businessmen Problems
sortings
1000
x7025
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x9472
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x200
980E
The Number Games
data structures
,
greedy
,
trees
2200
x1957
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