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Educational Codeforces Round 167 (Rated for Div. 2)
21:38:44
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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
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x812
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14780
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x16293
1519B
The Cake Is a Lie
dp
,
math
800
x30248
1519A
Red and Blue Beans
math
800
x28427
1517H
Fly Around the World
dp
,
geometry
3500
x66
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x424
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x451
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x959
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x7428
1517C
Fillomino 2
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
1400
x13166
1517B
Morning Jogging
constructive algorithms
,
greedy
,
sortings
1200
x13124
1517A
Sum of 2050
greedy
,
math
800
x25192
1516E
Baby Ehab Plays with Permutations
combinatorics
,
dp
,
math
2500
x826
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4150
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x11639
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x18495
1516A
Tit for Tat
greedy
800
x23196
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x239
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x221
1515G
Phoenix and Odometers
dfs and similar
,
graphs
,
math
,
number theory
2700
x961
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1712
1515E
Phoenix and Computers
combinatorics
,
dp
,
math
2200
x3420
1515D
Phoenix and Socks
greedy
,
sortings
,
two pointers
1500
x11230
1515C
Phoenix and Towers
constructive algorithms
,
data structures
,
greedy
1400
x16714
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x24424
1515A
Phoenix and Gold
constructive algorithms
,
greedy
,
math
800
x20085
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x591
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4136
1514C
Product 1 Modulo N
greedy
,
number theory
1600
x14558
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
1200
x23543
1514A
Perfectly Imperfect Array
math
,
number theory
800
x23893
1513F
Swapping Problem
brute force
,
constructive algorithms
,
data structures
,
sortings
2500
x1207
1513E
Cost Equilibrium
combinatorics
,
constructive algorithms
,
math
,
sortings
2300
x1428
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5140
1513C
Add One
dp
,
matrices
1600
x13459
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x14074
1513A
Array and Peaks
constructive algorithms
,
implementation
800
x19225
1512G
Short Task
brute force
,
dp
,
math
,
number theory
1700
x7926
1512F
Education
brute force
,
dp
,
greedy
,
implementation
1900
x6010
1512E
Permutation by Sum
brute force
,
greedy
,
math
1600
x10147
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x21984
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x19680
1512B
Almost Rectangle
implementation
800
x25119
1512A
Spy Detected!
brute force
,
implementation
800
x61175
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x712
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x422
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x2488
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11172
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x22648
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x22193
1511A
Review Site
greedy
800
x27278
1510K
King's Task
brute force
,
graphs
,
implementation
1200
x5318
1510J
Japanese Game
constructive algorithms
,
math
2700
x511
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x454
1510H
Hard Optimization
dp
3200
x98
1510G
Guide
2100
x1264
1510F
Fiber Shape
2800
x58
1510E
Equilibrium Point /\textbackslash/\textbackslash
2700
x244
1510D
Digits
dp
,
math
,
number theory
2100
x1809
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x210
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x723
1510A
ASCII Automata Art
3100
x152
1509C
The Sports Festival
dp
,
greedy
1800
x12017
1509B
TMT Document
greedy
1100
x21238
1509A
Average Height
constructive algorithms
800
x25797
1508F
Optimal Encoding
brute force
,
data structures
3500
x120
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x331
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x535
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1439
1508B
Almost Sorted
binary search
,
combinatorics
,
constructive algorithms
,
implementation
1800
x3874
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6066
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4140
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x3127
1506E
Restoring the Permutation
constructive algorithms
,
implementation
1500
x12760
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x21100
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x23917
1506B
Partial Replacement
greedy
,
implementation
1100
x19997
1506A
Strange Table
math
800
x30272
1505I
Mysterious language again, seriously?
*special problem
2200
x546
1505H
L BREAK into program
*special problem
2500
x492
1505G
Encoded message
*special problem
,
implementation
2600
x297
1505F
Math
*special problem
,
math
2200
x1480
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1732
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x746
1505C
Fibonacci Words
*special problem
,
implementation
1400
x6325
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x6033
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x14114
1504B
Flip the Bits
constructive algorithms
,
greedy
,
implementation
,
math
1200
x17693
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21495
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x137
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x598
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x980
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3236
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x6877
1503A
Balance the Bits
constructive algorithms
,
greedy
1600
x13125
1501B
Napoleon Cake
dp
,
implementation
,
sortings
900
x18650
1501A
Alexey and Train
implementation
800
x11545
1500F
Cupboards Jumps
dp
3500
x334
1500E
Subset Trick
binary search
,
data structures
3300
x215
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