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Contest is running
Codeforces Round 937 (Div. 4)
00:20:35
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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
174A
Problem About Equation
math
1100
x2572
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2571
22D
Segments
greedy
,
sortings
1900
x2571
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2570
316A1
Special Task
greedy
1100
x2570
1422D
Returning Home
graphs
,
shortest paths
,
sortings
2300
x2569
1203F2
Complete the Projects (hard version)
dp
,
greedy
2300
x2569
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2569
19A
World Football Cup
implementation
1400
x2569
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2568
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2568
1234E
Special Permutations
math
2000
x2566
763B
Timofey and rectangles
constructive algorithms
,
geometry
2100
x2566
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2565
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2564
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2560
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2560
513B2
Permutations
bitmasks
,
divide and conquer
,
math
1800
x2559
1415E
New Game Plus!
constructive algorithms
,
greedy
,
math
2200
x2558
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2556
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2554
494B
Obsessive String
dp
,
strings
2000
x2553
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2551
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2550
707D
Persistent Bookcase
bitmasks
,
data structures
,
dfs and similar
,
implementation
2200
x2550
1250B
The Feast and the Bus
brute force
,
constructive algorithms
,
greedy
,
math
1800
x2549
142A
Help Farmer
brute force
,
math
1600
x2546
1097D
Makoto and a Blackboard
dp
,
math
,
number theory
,
probabilities
2200
x2543
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2541
1263E
Editor
data structures
,
implementation
2100
x2540
39B
Company Income Growth
greedy
1300
x2540
117C
Cycle
dfs and similar
,
graphs
2000
x2536
203B
Game on Paper
brute force
,
implementation
1300
x2535
1108F
MST Unification
binary search
,
dsu
,
graphs
,
greedy
2100
x2532
1185G1
Playlist for Polycarp (easy version)
bitmasks
,
combinatorics
,
dp
2100
x2530
77B
Falling Anvils
math
,
probabilities
1800
x2529
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2526
1059D
Nature Reserve
binary search
,
geometry
,
ternary search
2200
x2525
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2525
911G
Mass Change Queries
data structures
2500
x2523
599D
Spongebob and Squares
brute force
,
math
1900
x2523
413A
Data Recovery
implementation
1200
x2523
609D
Gadgets for dollars and pounds
binary search
,
greedy
,
two pointers
2000
x2517
121B
Lucky Transformation
strings
1500
x2517
1081E
Missing Numbers
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1900
x2516
690D1
The Wall (easy)
1200
x2516
543D
Road Improvement
dp
,
trees
2300
x2515
1542D
Priority Queue
combinatorics
,
dp
,
implementation
,
math
,
ternary search
2200
x2514
571B
Minimization
dp
,
greedy
,
sortings
2000
x2513
1303E
Erase Subsequences
dp
,
strings
2200
x2510
435C
Cardiogram
implementation
1600
x2510
632E
Thief in a Shop
divide and conquer
,
dp
,
fft
,
math
2400
x2509
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2509
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2508
935D
Fafa and Ancient Alphabet
math
,
probabilities
1900
x2506
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2505
1223E
Paint the Tree
dp
,
sortings
,
trees
2100
x2505
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2505
1154F
Shovels Shop
dp
,
greedy
,
sortings
2100
x2505
770C
Online Courses In BSU
*special problem
,
dfs and similar
,
graphs
,
implementation
1500
x2502
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2502
1556E
Equilibrium
data structures
,
dp
,
greedy
2200
x2499
372B
Counting Rectangles is Fun
brute force
,
divide and conquer
,
dp
1900
x2498
853B
Jury Meeting
greedy
,
sortings
,
two pointers
1800
x2497
222E
Decoding Genome
dp
,
matrices
1900
x2494
487C
Prefix Product Sequence
constructive algorithms
,
math
,
number theory
2300
x2493
335A
Banana
binary search
,
constructive algorithms
,
greedy
1400
x2493
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2492
1267J
Just Arrange the Icons
greedy
,
implementation
,
math
1800
x2492
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2492
1214E
Petya and Construction Set
constructive algorithms
,
graphs
,
math
,
sortings
,
trees
2000
x2490
929A
Прокат велосипедов
*special problem
,
greedy
,
implementation
1400
x2490
786C
Till I Collapse
data structures
,
divide and conquer
2400
x2490
1528C
Trees of Tranquillity
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2489
1495C
Garden of the Sun
constructive algorithms
,
graphs
2300
x2488
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2487
999F
Cards and Joy
dp
2000
x2484
928B
Chat
*special problem
,
dp
1400
x2479
223A
Bracket Sequence
data structures
,
expression parsing
,
implementation
1700
x2477
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2473
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2469
1848D
Vika and Bonuses
binary search
,
brute force
,
math
,
ternary search
2200
x2467
101B
Buses
binary search
,
data structures
,
dp
1700
x2467
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2466
370B
Berland Bingo
implementation
1300
x2466
1767C
Count Binary Strings
data structures
,
dp
2100
x2465
523C
Name Quest
*special problem
,
greedy
1400
x2465
691C
Exponential notation
implementation
,
strings
1800
x2464
1725H
Hot Black Hot White
constructive algorithms
,
math
1800
x2462
749D
Leaving Auction
binary search
,
data structures
2000
x2462
1184D1
Parallel Universes (Easy)
implementation
1600
x2460
755D
PolandBall and Polygon
data structures
2000
x2460
171D
Broken checker
*special problem
,
brute force
1300
x2455
1029F
Multicolored Markers
binary search
,
brute force
,
math
,
number theory
2000
x2452
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2450
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2449
38E
Let's Go Rolling!
dp
,
sortings
1800
x2449
1228E
Another Filling the Grid
combinatorics
,
dp
,
math
2300
x2445
955C
Sad powers
binary search
,
math
,
number theory
2100
x2441
911E
Stack Sorting
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x2440
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