Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round (Div. 2)
3 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
brute force
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
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12514
1846E2
Rudolf and Snowflakes (hard version)
binary search
,
brute force
,
implementation
,
math
1800
x6784
1846E1
Rudolf and Snowflakes (simple version)
brute force
,
implementation
,
math
1300
x16032
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26491
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7542
1844F1
Min Cost Permutation (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
math
2600
x749
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x11571
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7501
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1738
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x954
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x923
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7614
1834F
Typewriter
brute force
,
math
2500
x501
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4489
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x13001
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2105
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x20626
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x626
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4720
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x25190
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1166
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1541
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x9083
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14800
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1207
1823B
Sort with Step
brute force
,
math
,
sortings
900
x15684
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2361
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6811
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5816
1822A
TubeTube Feed
brute force
,
implementation
800
x23948
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2312
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x4860
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13935
1821B
Sort the Subarray
brute force
,
greedy
1100
x17695
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x611
1819A
Constructive Problem
brute force
,
greedy
1300
x12346
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x256
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3969
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2942
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x533
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x840
1814B
Long Legs
brute force
,
math
1700
x9759
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5633
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x3078
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x14160
1810A
Beautiful Sequence
brute force
,
greedy
800
x20540
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x428
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2244
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3681
1808A
Lucky Numbers
brute force
,
implementation
900
x17729
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x18303
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x6055
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2741
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7405
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x853
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1559
1805A
We Need the Zero
bitmasks
,
brute force
800
x22058
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1391
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4506
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11788
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12378
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12431
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x782
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x11035
1798E
Multitest Generator
brute force
,
dp
2300
x1549
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x16227
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1225
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3832
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x170
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18680
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x21586
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23429
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1325
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x375
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1333
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13657
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11886
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x28315
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3217
1790C
Premutation
brute force
,
implementation
,
math
1000
x23392
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x540
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x782
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1618
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15968
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x17781
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3800
1788A
One and Two
brute force
,
implementation
,
math
800
x28755
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x412
1786B
Cake Assembly Line
brute force
,
sortings
1300
x8782
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x311
1784A
Monsters (easy version)
brute force
,
greedy
1000
x14761
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2059
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4290
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1286
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5376
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7319
1781B
Going to the Cinema
brute force
,
greedy
,
sortings
1000
x13375
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1412
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1344
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x17248
←
1
2
3
4
5
...
16
17
→
User lists
Name