Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
Rayan
→ Pay attention
Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
26:20:54
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
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x20276
1811B
Conveyor Belts
implementation
,
math
1000
x20815
1811A
Insert Digit
greedy
,
math
,
strings
800
x31688
1810H
Last Number
combinatorics
,
math
2900
x141
1810G
The Maximum Prefix
dp
3200
x745
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x583
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x3287
1810D
Climbing the Tree
binary search
,
math
1700
x7570
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x14801
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17702
1810A
Beautiful Sequence
brute force
,
greedy
800
x20923
1809G
Prediction
combinatorics
,
dp
,
math
2800
x453
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x789
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x873
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x6450
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x13088
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x20287
1809A
Garland
implementation
800
x24125
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x449
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x703
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1369
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2399
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3886
1808B
Playing in a Casino
math
,
sortings
1200
x17869
1808A
Lucky Numbers
brute force
,
implementation
900
x18579
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x20048
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x19503
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x6476
1807E
Interview
binary search
,
implementation
,
interactive
1300
x13541
1807D
Odd Queries
data structures
,
implementation
900
x34955
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x31118
1807B
Grab the Candies
greedy
800
x43153
1807A
Plus or Minus
implementation
800
x65284
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x301
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x363
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2902
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x946
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7769
1806B
Mex Master
constructive algorithms
,
greedy
900
x18177
1806A
Walking Master
geometry
,
greedy
,
math
800
x26166
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x359
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x956
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1664
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6835
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12781
1805B
The String Has a Target
greedy
,
strings
800
x18781
1805A
We Need the Zero
bitmasks
,
brute force
800
x24895
1804H
Code Lock
bitmasks
,
dp
3300
x190
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x207
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x975
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1489
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4717
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x12388
1804B
Vaccination
greedy
,
implementation
1000
x14406
1804A
Lame King
greedy
,
math
800
x18050
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x13507
1802A
Likes
greedy
,
implementation
800
x15973
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x422
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x608
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x487
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2312
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3547
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x6459
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8736
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x2149
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3996
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x13157
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x13129
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x24510
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x23144
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x24212
1800B
Count the Number of Pairs
greedy
,
strings
1000
x25733
1800A
Is It a Cat?
implementation
,
strings
800
x32309
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x298
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x805
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x859
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1232
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2577
1799D1
Hot Start Up (easy version)
dp
1900
x4668
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x6002
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x11556
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11676
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x516
1798E
Multitest Generator
brute force
,
dp
2300
x1646
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x10346
1798C
Candy Store
greedy
,
math
,
number theory
1700
x8350
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x16995
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x20212
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x365
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1344
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x4057
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7859
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x16624
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x17767
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x175
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x783
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4466
1796C
Maximum Set
binary search
,
math
1600
x10677
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16738
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18948
←
1
2
...
14
15
16
17
18
...
100
101
→
User lists
Name