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:
—
constructive algorithms
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
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1340
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x129963
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10666
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x765
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1431
260C
Balls and Boxes
constructive algorithms
,
greedy
,
implementation
1700
x2941
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x6927
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2612
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9141
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2264
241G
Challenging Balloons
constructive algorithms
1900
x541
238B
Boring Partition
constructive algorithms
1800
x1280
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2023
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x558
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1464
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x284
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2478
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3573
226D
The table
constructive algorithms
,
greedy
2100
x955
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11343
220B
Little Elephant and Array
constructive algorithms
,
data structures
1800
x9691
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x9124
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4923
213D
Stars
constructive algorithms
,
geometry
2300
x335
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x718
209B
Pixels
constructive algorithms
,
math
2100
x363
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x2980
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25683
198D
Cube Snake
constructive algorithms
2700
x105
197A
Plate Game
constructive algorithms
,
games
,
math
1600
x6191
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x801
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x508
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3887
183A
Headquarters
constructive algorithms
,
math
1700
x535
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2479
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x469
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x247
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4403
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1942
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2206
148C
Terse princess
constructive algorithms
,
greedy
1700
x3081
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x89337
145B
Lucky Number 2
constructive algorithms
1800
x2168
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2152
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x915
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2408
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1325
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x464
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x608
128D
Numbers
constructive algorithms
,
implementation
2000
x1096
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2483
126C
E-reader Display
constructive algorithms
,
greedy
2000
x714
125D
Two progressions
constructive algorithms
,
greedy
2200
x394
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x908
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1070
118B
Present from Lena
constructive algorithms
,
implementation
1000
x29131
110B
Lucky String
constructive algorithms
,
strings
1100
x10071
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x659
103C
Russian Roulette
constructive algorithms
,
greedy
1900
x939
98D
Help Monks
constructive algorithms
2500
x182
97B
Superset
constructive algorithms
,
divide and conquer
2300
x810
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x264
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x402
85A
Domino
constructive algorithms
,
implementation
1300
x1772
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2022
81D
Polycarp's Picture Gallery
constructive algorithms
,
greedy
2100
x641
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x13035
74E
Shift It!
constructive algorithms
2800
x150
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3094
63D
Dividing Island
constructive algorithms
1900
x1241
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x610
53C
Little Frog
constructive algorithms
1200
x6350
49C
Disposition
constructive algorithms
,
math
1700
x1661
48H
Black and White
constructive algorithms
2800
x137
45J
Planting Trees
constructive algorithms
1800
x923
45E
Director
constructive algorithms
,
greedy
2000
x533
44J
Triminoes
constructive algorithms
,
greedy
2000
x559
43D
Journey
brute force
,
constructive algorithms
,
implementation
2000
x1069
42D
Strange town
constructive algorithms
,
math
2300
x391
42C
Safe cracking
brute force
,
constructive algorithms
2200
x458
41E
3-cycles
constructive algorithms
,
graphs
,
greedy
1900
x1916
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3939
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x501
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x691
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2371
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2733
26E
Multithreading
constructive algorithms
2400
x368
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x831
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1376
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3250
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3283
12E
Start of the session
constructive algorithms
2100
x1175
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x12869
10E
Greedy Change
constructive algorithms
2600
x815
8B
Obsession with Robots
constructive algorithms
,
graphs
,
implementation
1400
x4272
7A
Kalevitch and Chess
brute force
,
constructive algorithms
1100
x7096
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x13203
4B
Before an Exam
constructive algorithms
,
greedy
1200
x24175
←
1
2
...
15
16
17
→
User lists
Name