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Before contest
Codeforces Round 937 (Div. 4)
04:04:58
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Difficulty:
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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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Status
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Custom test
Problems
#
Name
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x81473
706B
Interesting drink
binary search
,
dp
,
implementation
1100
x57169
363B
Fence
brute force
,
dp
1100
x48274
456A
Laptops
sortings
1100
x44764
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x43002
313B
Ilya and Queries
dp
,
implementation
1100
x40948
368B
Sereja and Suffixes
data structures
,
dp
1100
x39073
519B
A and B and Compilation Errors
data structures
,
implementation
,
sortings
1100
x37359
1327A
Sum of Odd Integers
math
1100
x36470
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x35307
1335C
Two Teams Composing
binary search
,
greedy
,
implementation
,
sortings
1100
x32984
1360C
Similar Pairs
constructive algorithms
,
graph matchings
,
greedy
,
sortings
1100
x31424
1490C
Sum of Cubes
binary search
,
brute force
,
brute force
,
math
1100
x30802
1472C
Long Jumps
dp
,
graphs
1100
x29483
82A
Double Cola
implementation
,
math
1100
x29272
1366A
Shovels and Swords
binary search
,
greedy
,
math
1100
x28708
349A
Cinema Line
greedy
,
implementation
1100
x28446
1409B
Minimum Product
brute force
,
greedy
,
math
1100
x28062
1324B
Yet Another Palindrome Problem
brute force
,
strings
1100
x27245
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x26629
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x26336
227B
Effective Approach
implementation
1100
x26027
463B
Caisa and Pylons
brute force
,
implementation
,
math
1100
x25500
1213B
Bad Prices
data structures
,
implementation
1100
x25341
1345B
Card Constructions
binary search
,
brute force
,
dp
,
math
1100
x25328
1334B
Middle Class
greedy
,
sortings
1100
x25052
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x25038
1791E
Negatives and Positives
dp
,
greedy
,
sortings
1100
x24875
478A
Initial Bet
implementation
1100
x24871
1463A
Dungeon
binary search
,
math
1100
x24290
1676E
Eating Queries
binary search
,
greedy
,
sortings
1100
x24162
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x23798
1703D
Double Strings
brute force
,
data structures
,
strings
1100
x23788
1382B
Sequential Nim
dp
,
games
1100
x23772
1365A
Matrix Game
games
,
greedy
,
implementation
1100
x23482
1342B
Binary Period
constructive algorithms
,
strings
1100
x23087
1370B
GCD Compression
constructive algorithms
,
math
,
number theory
1100
x22980
1557B
Moamen and k-subarrays
greedy
,
sortings
1100
x22675
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x22442
651A
Joysticks
dp
,
greedy
,
implementation
,
math
1100
x22374
1626B
Minor Reduction
greedy
,
strings
1100
x22175
1108B
Divisors of Two Integers
brute force
,
greedy
,
math
,
number theory
1100
x22175
1873E
Building an Aquarium
binary search
,
sortings
1100
x22041
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x21930
258A
Little Elephant and Bits
greedy
,
math
1100
x21876
1547C
Pair Programming
greedy
,
two pointers
1100
x21869
1857B
Maximum Rounding
greedy
,
implementation
,
math
1100
x21810
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x21788
1722D
Line
greedy
,
sortings
1100
x21778
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x21769
300A
Array
brute force
,
constructive algorithms
,
implementation
1100
x21692
1872C
Non-coprime Split
math
,
number theory
1100
x21626
296A
Yaroslav and Permutations
greedy
,
math
1100
x21571
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21398
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21215
1333B
Kind Anton
greedy
,
implementation
1100
x21180
1702C
Train and Queries
data structures
,
greedy
1100
x21133
1739B
Array Recovery
constructive algorithms
,
greedy
,
math
1100
x21127
1618C
Paint the Array
math
1100
x21008
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x21004
1509B
TMT Document
greedy
1100
x20977
1669D
Colorful Stamp
implementation
1100
x20782
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x20691
1401B
Ternary Sequence
constructive algorithms
,
greedy
,
math
1100
x20684
1529B
Sifid and Strange Subsequences
greedy
,
math
,
sortings
1100
x20275
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20266
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20195
1850E
Cardboard for Pictures
binary search
,
geometry
,
implementation
,
math
1100
x20173
630C
Lucky Numbers
combinatorics
,
math
1100
x20043
1407A
Ahahahahahahahaha
constructive algorithms
,
math
1100
x20004
1791G1
Teleporters (Easy Version)
greedy
,
sortings
1100
x19971
1914C
Quests
greedy
,
math
1100
x19848
1506B
Partial Replacement
greedy
,
implementation
1100
x19805
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x19518
1633C
Kill the Monster
brute force
,
math
1100
x19469
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19436
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x19435
1593D1
All are Same
math
,
number theory
1100
x19382
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x19326
1708B
Difference of GCDs
constructive algorithms
,
math
1100
x19202
66B
Petya and Countryside
brute force
,
implementation
1100
x19174
1455C
Ping-pong
constructive algorithms
,
games
,
math
1100
x19157
1729C
Jumping on Tiles
constructive algorithms
,
strings
1100
x19132
1712C
Sort Zero
greedy
,
sortings
1100
x19072
1471B
Strange List
brute force
,
greedy
,
implementation
,
math
1100
x19058
1332A
Exercising Walk
greedy
,
implementation
,
math
1100
x19048
1631B
Fun with Even Subarrays
dp
,
greedy
1100
x19046
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19034
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19017
767A
Snacktower
data structures
,
implementation
1100
x19008
1481B
New Colony
brute force
,
greedy
,
implementation
1100
x18977
1616B
Mirror in the String
greedy
,
strings
1100
x18949
1426C
Increase and Copy
binary search
,
constructive algorithms
,
math
1100
x18940
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x18890
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x18774
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x18627
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x18586
1594B
Special Numbers
bitmasks
,
math
1100
x18574
1692D
The Clock
brute force
,
implementation
1100
x18504
287A
IQ Test
brute force
,
implementation
1100
x18467
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