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Before contest
Codeforces Round #605 (Div. 3)
6 days
→ Filter Problems
Difficulty:
—
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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Custom test
Problems
#
Name
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x4039
1267K
Key Storage
combinatorics
,
math
x643
1267J
Just Arrange the Icons
greedy
,
implementation
,
math
x823
1267G
Game Relics
math
,
probabilities
x57
1263C
Everyone is a Winner!
binary search
,
math
,
meet-in-the-middle
,
number theory
1400
x5062
1263A
Sweet Problem
math
1200
x7087
1260C
Infinite Fence
greedy
,
math
,
number theory
1700
x3465
1260B
Obtain Two Zeroes
binary search
,
math
1200
x6017
1260A
Heating
math
1000
x6819
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x81
1227F2
Wrong Answer on test 233 (Hard Version)
combinatorics
,
math
2400
x620
1227A
Math Problem
math
1100
x5199
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x636
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x1381
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2000
x2068
1255A
Changing Volume
math
800
x8658
1253C
Sweets Eating
dp
,
greedy
,
math
,
sortings
1500
x5107
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2700
x239
1257B
Magic Stick
math
1000
x9465
1257A
Two Rival Students
greedy
,
math
700
x10825
1242D
Number Discovery
math
3400
x65
1242A
Tile Painting
constructive algorithms
,
math
,
number theory
1500
x6388
1256A
Payment Without Change
math
1000
x11659
1245A
Good ol' Numbers Coloring
math
,
number theory
1000
x8487
1250L
Divide The Students
binary search
,
greedy
,
math
1700
x1738
1250H
Happy Birthday
math
1500
x1959
1250B
The Feast and the Bus
brute force
,
constructive algorithms
,
greedy
,
math
1900
x1391
1225D
Power Products
hashing
,
math
,
number theory
1900
x3062
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x4566
1225A
Forgetting Things
math
900
x8768
1252K
Addition Robot
data structures
,
math
,
matrices
2200
x1021
1249C2
Good Numbers (hard version)
binary search
,
greedy
,
math
,
meet-in-the-middle
1500
x5531
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x7178
1249B1
Books Exchange (easy version)
dsu
,
math
1000
x9656
1249A
Yet Another Dividing into Teams
math
900
x11983
1248A
Integer Points
geometry
,
math
900
x7554
1239A
Ivan the Fool and the Probability Theory
combinatorics
,
dp
,
math
1700
x3937
1248B
Grow The Tree
greedy
,
math
,
sortings
900
x7810
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
2900
x38
1236B
Alice and the List of Presents
combinatorics
,
math
1400
x5876
1236A
Stones
brute force
,
greedy
,
math
800
x9528
1237E
Balanced Binary Search Trees
dp
,
math
2400
x704
1237A
Balanced Rating Changes
implementation
,
math
1100
x8172
1244G
Running in Pairs
constructive algorithms
,
greedy
,
math
2500
x775
1244C
The Football Season
brute force
,
math
,
number theory
1900
x4018
1244A
Pens and Pencils
math
700
x10913
1238C
Standard Free2play
dp
,
greedy
,
math
1600
x4260
1238A
Prime Subtraction
math
,
number theory
900
x11108
1223G
Wooden Raft
binary search
,
math
,
number theory
3100
x99
1223A
CME
math
600
x10946
1234E
Special Permutations
math
2000
x1420
1234A
Equalize Prices Again
math
900
x13768
1228E
Another Filling the Grid
combinatorics
,
dp
,
math
2300
x1195
1228C
Primes and Multiplication
math
,
number theory
1600
x5043
1228B
Filling the Grid
implementation
,
math
1300
x7644
1210E
Wojtek and Card Tricks
math
2700
x231
1210C
Kamil and Making a Stream
math
,
number theory
,
trees
2100
x1914
1216E2
Numerical Sequence (hard version)
binary search
,
math
2300
x731
1216E1
Numerical Sequence (easy version)
binary search
,
brute force
,
math
1900
x1876
1216D
Swords
math
1300
x5815
1216C
White Sheet
geometry
,
math
1500
x3466
1221C
Perfect Team
binary search
,
math
1200
x8388
1221A
2048 Game
brute force
,
greedy
,
math
1000
x9322
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x2244
1220B
Multiplication Table
math
,
number theory
1300
x6619
1215D
Ticket Game
games
,
greedy
,
math
1700
x3246
1215A
Yellow Cards
greedy
,
implementation
,
math
1000
x7150
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x49
1209B
Koala and Lights
implementation
,
math
,
number theory
1300
x5551
1209A
Paint the Numbers
greedy
,
implementation
,
math
900
x7756
1211G
King's Path
*special problem
,
math
,
trees
2500
x34
1211D
Teams
*special problem
,
binary search
,
greedy
,
math
2200
x126
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x948
1217B
Zmei Gorynich
greedy
,
math
1600
x6123
1217A
Creating a Character
binary search
,
math
1300
x8309
1214E
Petya and Construction Set
constructive algorithms
,
graphs
,
math
,
sortings
,
trees
2000
x1565
1214B
Badges
brute force
,
math
1100
x6417
1214A
Optimal Currency Exchange
brute force
,
math
1300
x5609
1213D2
Equalizing by Division (hard version)
brute force
,
math
,
sortings
1600
x5407
1213C
Book Reading
math
1200
x9625
1213A
Chips Moving
math
900
x13108
1208G
Polygons
greedy
,
math
,
number theory
2700
x366
1208A
XORinacci
math
900
x10125
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1800
x3019
1207A
There Are Two Types Of Burgers
brute force
,
greedy
,
implementation
,
math
700
x12577
1204E
Natasha, Sasha and the Prefix Sums
combinatorics
,
dp
,
math
,
number theory
2400
x773
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x1919
1204B
Mislove Has Lost an Array
greedy
,
math
1000
x10696
1204A
BowWow and the Timetable
math
1100
x10387
1206A
Choose Two Numbers
math
,
sortings
800
x12255
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x33
1205A
Almost Equal
constructive algorithms
,
greedy
,
math
1300
x8801
1203C
Common Divisors
implementation
,
math
1300
x8621
1203B
Equal Rectangles
greedy
,
math
1200
x8492
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2500
x543
1200C
Round Corridor
math
,
number theory
1500
x6118
1202F
You Are Given Some Letters...
binary search
,
implementation
,
math
2800
x166
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x2654
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x1331
1201C
Maximum Median
binary search
,
greedy
,
math
,
sortings
1400
x6389
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