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Before contest
Codeforces Round (Div. 2)
3 days
→ Filter Problems
Difficulty:
—
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
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Status
Standings
Custom test
Problems
#
Name
1753C
Wish I Knew How to Sort
dp
,
math
,
probabilities
2000
x2910
474C
Captain Marmot
brute force
,
geometry
2000
x2906
1667B
Optimal Partition
data structures
,
dp
2100
x2902
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x2900
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x2894
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x2885
703D
Mishka and Interesting sum
data structures
2100
x2878
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x2867
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x2863
940E
Cashback
data structures
,
dp
,
greedy
,
math
2000
x2848
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x2846
671B
Robin Hood
binary search
,
greedy
2000
x2846
1198C
Matching vs Independent Set
constructive algorithms
,
graphs
,
greedy
,
sortings
2000
x2820
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x2806
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x2801
1203F1
Complete the Projects (easy version)
greedy
2100
x2796
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2791
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x2787
1271E
Common Number
binary search
,
combinatorics
,
dp
,
math
2100
x2784
1558C
Bottom-Tier Reversals
constructive algorithms
,
greedy
2000
x2782
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x2775
235B
Let's Play Osu!
dp
,
math
,
probabilities
2000
x2771
1606E
Arena
combinatorics
,
dp
,
math
2100
x2767
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x2767
893E
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
2000
x2767
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x2753
1030E
Vasya and Good Sequences
bitmasks
,
dp
2000
x2751
374A
Inna and Pink Pony
greedy
,
implementation
2000
x2738
388C
Fox and Card Game
games
,
greedy
,
sortings
2000
x2728
1354E
Graph Coloring
dfs and similar
,
dp
,
graphs
2100
x2727
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x2726
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x2723
1682D
Circular Spanning Tree
constructive algorithms
,
implementation
,
trees
2000
x2717
8C
Looking for Order
bitmasks
,
dp
2000
x2712
842D
Vitya and Strange Lesson
binary search
,
data structures
2000
x2711
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x2706
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x2703
576C
Points on Plane
constructive algorithms
,
divide and conquer
,
geometry
,
greedy
,
sortings
2100
x2698
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2696
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x2683
891B
Gluttony
constructive algorithms
,
greedy
2000
x2682
1009E
Intercity Travelling
combinatorics
,
math
,
probabilities
2000
x2680
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x2679
1472F
New Year's Puzzle
brute force
,
dp
,
graph matchings
,
greedy
,
sortings
2100
x2664
1265E
Beautiful Mirrors
data structures
,
dp
,
math
,
probabilities
2100
x2661
515D
Drazil and Tiles
constructive algorithms
,
greedy
2000
x2651
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2648
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2642
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2636
1060E
Sergey and Subway
dfs and similar
,
dp
,
trees
2000
x2628
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x2616
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2616
1320C
World of Darkraft: Battle for Azathoth
brute force
,
data structures
,
sortings
2000
x2614
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x2614
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x2609
689D
Friends and Subsequences
binary search
,
data structures
2100
x2603
1690G
Count the Trains
binary search
,
data structures
,
greedy
,
sortings
2000
x2586
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2567
629C
Famil Door and Brackets
dp
,
strings
2000
x2564
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x2563
1672F1
Array Shuffling
constructive algorithms
,
graphs
,
greedy
2000
x2557
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2553
641E
Little Artem and Time Machine
data structures
2000
x2542
1195E
OpenStreetMap
data structures
,
two pointers
2100
x2537
466D
Increase Sequence
combinatorics
,
dp
2100
x2512
1147C
Thanos Nim
games
2000
x2492
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x2492
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2484
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x2484
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2483
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2478
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x2461
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2444
360B
Levko and Array
binary search
,
dp
2000
x2437
264C
Choosing Balls
dp
2000
x2437
353D
Queue
constructive algorithms
,
dp
2000
x2431
763B
Timofey and rectangles
constructive algorithms
,
geometry
2100
x2429
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2426
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2425
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2419
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2414
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2407
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x2406
507E
Breaking Good
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2399
863E
Turn Off The TV
data structures
,
sortings
2000
x2397
59E
Shortest Path
graphs
,
shortest paths
2000
x2397
494B
Obsessive String
dp
,
strings
2000
x2387
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2383
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2378
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2371
1263E
Editor
data structures
,
implementation
2100
x2371
1551D2
Domino (hard version)
constructive algorithms
,
implementation
,
math
2100
x2370
522D
Closest Equals
*special problem
,
data structures
2000
x2370
1234E
Special Permutations
math
2000
x2367
1209E1
Rotate Columns (easy version)
bitmasks
,
brute force
,
dp
,
greedy
,
sortings
2000
x2357
128C
Games with Rectangle
combinatorics
,
dp
2000
x2351
1271D
Portals
data structures
,
dp
,
greedy
,
implementation
,
sortings
2100
x2345
749D
Leaving Auction
binary search
,
data structures
2000
x2342
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2341
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2341
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