Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
42:50:00
Register now »
→ 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
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
1187E
Tree Painting
dfs and similar
,
dp
,
trees
2100
x7402
1185G1
Playlist for Polycarp (easy version)
bitmasks
,
combinatorics
,
dp
2100
x2553
1185F
Two Pizzas
bitmasks
,
brute force
2100
x1800
1185E
Polycarp and Snakes
brute force
,
implementation
2000
x2438
1184E2
Daleks' Invasion (medium)
dfs and similar
,
graphs
,
shortest paths
,
trees
2100
x898
1184A2
Heidi Learns Hashing (Medium)
brute force
,
number theory
2100
x928
1183G
Candy Box (hard version)
greedy
,
implementation
,
sortings
2000
x2276
1183F
Topforces Strikes Back
brute force
,
math
,
sortings
2100
x1763
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4507
1176F
Destroy it!
dp
,
implementation
,
sortings
2100
x1736
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2421
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2708
1165F2
Microtransactions (hard version)
binary search
,
greedy
,
implementation
2000
x2019
1165F1
Microtransactions (easy version)
binary search
,
greedy
2000
x1763
1163D
Mysterious Code
dp
,
strings
2100
x1210
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1696
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2512
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x5883
1154F
Shovels Shop
dp
,
greedy
,
sortings
2100
x2537
1152D
Neko and Aki's Prank
dp
,
greedy
,
trees
2100
x2341
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3031
1147C
Thanos Nim
games
2000
x3088
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1060
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2676
1132F
Clear the String
dp
2000
x7248
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3027
1129B
Wrong Answer
constructive algorithms
2000
x2148
1120C
Compress String
dp
,
strings
2100
x1870
1117D
Magic Gems
dp
,
math
,
matrices
2100
x4001
1108F
MST Unification
binary search
,
dsu
,
graphs
,
greedy
2100
x2548
1108E2
Array and Segments (Hard version)
data structures
,
implementation
2100
x2114
1106E
Lunar New Year and Red Envelopes
data structures
,
dp
2100
x2314
1103B
Game with modulo
binary search
,
constructive algorithms
,
interactive
2000
x3166
1102F
Elongated Matrix
binary search
,
bitmasks
,
brute force
,
dp
,
graphs
2000
x1900
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4392
1098B
Nice table
brute force
,
constructive algorithms
,
greedy
,
math
2100
x1465
1092E
Minimal Diameter Forest
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2000
x1615
1090L
Berland University
greedy
,
math
2000
x1246
1090K
Right Expansion Of The Mind
math
2000
x1048
1090I
Minimal Product
2000
x1024
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2754
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1845
1082E
Increasing Frequency
binary search
,
dp
,
greedy
2000
x4000
1080D
Olya and magical square
constructive algorithms
,
implementation
,
math
2000
x1519
1077F2
Pictures with Kittens (hard version)
data structures
,
dp
2100
x2864
1070E
Getting Deals Done
binary search
,
data structures
2100
x1189
1070C
Cloud Computing
data structures
,
greedy
2000
x1995
1066F
Yet another 2D Walking
dp
2100
x1759
1061D
TV Shows
data structures
,
greedy
,
implementation
,
sortings
2000
x2292
1060E
Sergey and Subway
dfs and similar
,
dp
,
trees
2000
x2972
1057C
Tanya and Colored Candies
*special problem
,
dp
2000
x863
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1971
1044C
Optimal Polygon Perimeter
dp
,
geometry
2100
x1199
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x2275
1033D
Divisors
interactive
,
math
,
number theory
2000
x2302
1032E
The Unbearable Lightness of Weights
dp
,
math
2100
x1472
1030E
Vasya and Good Sequences
bitmasks
,
dp
2000
x2967
1029F
Multicolored Markers
binary search
,
brute force
,
math
,
number theory
2000
x2467
1029E
Tree with Small Distances
dp
,
graphs
,
greedy
2100
x2767
1028D
Order book
combinatorics
,
data structures
,
greedy
2100
x1708
1027E
Inverse Coloring
combinatorics
,
dp
,
math
2100
x1858
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x3294
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1950
1019B
The hat
binary search
,
interactive
2000
x1891
1010D
Mars rover
dfs and similar
,
graphs
,
implementation
,
trees
2000
x2338
1009E
Intercity Travelling
combinatorics
,
math
,
probabilities
2000
x2882
1006F
Xor-Paths
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2100
x4628
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1606
1003E
Tree Constructing
constructive algorithms
,
graphs
2100
x2421
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x3904
999F
Cards and Joy
dp
2000
x2509
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6340
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x2856
995A
Tesla
constructive algorithms
,
implementation
2100
x1499
993C
Careful Maneuvering
bitmasks
,
brute force
,
geometry
2100
x1479
992D
Nastya and a Game
brute force
,
implementation
,
math
2100
x1583
990E
Post Lamps
brute force
,
greedy
2100
x1973
988F
Rain and Umbrellas
dp
2100
x2192
988E
Divisibility by 25
brute force
,
greedy
2100
x3636
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3242
985D
Sand Fortress
binary search
,
constructive algorithms
,
math
2100
x2253
980D
Perfect Groups
dp
,
math
,
number theory
2100
x2407
976E
Well played!
greedy
,
sortings
2100
x2161
975D
Ghosts
geometry
,
math
2000
x1867
965C
Greedy Arkady
math
2000
x2053
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2693
961D
Pair Of Lines
geometry
2000
x4090
960F
Pathwalks
data structures
,
dp
,
graphs
2100
x2665
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1677
958C2
Encryption (medium)
dp
2000
x1134
958A2
Death Stars (medium)
hashing
,
strings
2000
x875
955C
Sad powers
binary search
,
math
,
number theory
2100
x2454
954G
Castle Defense
binary search
,
data structures
,
greedy
,
two pointers
2000
x1893
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x975
954E
Water Taps
binary search
,
greedy
,
sortings
2000
x1798
952E
Cheese Board
2000
x623
940E
Cashback
data structures
,
dp
,
greedy
,
math
2000
x3399
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5023
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x3028
933B
A Determined Cleanup
math
2000
x1873
←
1
2
3
4
5
6
...
8
9
→
User lists
Name