Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round 987 (Div. 2)
10:19:01
Register now »
*has extra registration
→ 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
58B
Coins
greedy
1300
x12265
57C
Array
combinatorics
,
math
1900
x2681
57B
Martian Architecture
implementation
1600
x1022
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2912
56C
Corporation Mail
data structures
,
expression parsing
,
implementation
1700
x1172
56B
Spoilt Permutation
implementation
1300
x3735
55C
Pie or die
games
1900
x1655
55B
Smallest number
brute force
1600
x2873
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x776
54A
Presents
implementation
1300
x2080
53D
Physical Education
sortings
1500
x2045
53B
Blog Photo
binary search
,
implementation
1700
x1417
52B
Right Triangles
combinatorics
1600
x2067
51C
Three Base Stations
binary search
,
greedy
1800
x2009
51B
bHTML Tables Analisys
expression parsing
1700
x874
51A
Cheaterius's Problem
implementation
1300
x1835
50B
Choosing Symbol Pairs
strings
1500
x5716
49D
Game
brute force
,
dp
,
implementation
1800
x1919
49C
Disposition
constructive algorithms
,
math
1700
x1695
49B
Sum
math
1500
x2492
48D
Permutations
greedy
1500
x2530
48C
The Race
math
1800
x784
46E
Comb
data structures
,
dp
1900
x965
46D
Parking Lot
data structures
,
implementation
1800
x984
46C
Hamsters and Tigers
two pointers
1600
x2455
45J
Planting Trees
constructive algorithms
1800
x946
45I
TCMCF+++
greedy
1400
x2492
45D
Event Dates
greedy
,
meet-in-the-middle
,
sortings
1900
x1700
45C
Dancing Lessons
data structures
1900
x916
44H
Phone Number
dp
1700
x1750
44E
Anfisa the Monkey
dp
1400
x5168
44D
Hyperdrive
math
1800
x716
44C
Holidays
implementation
1300
x3487
44B
Cola
implementation
1500
x2008
43C
Lucky Tickets
greedy
1300
x4285
42B
Game of chess unfinished
implementation
1700
x955
42A
Guilty --- to the kitchen!
greedy
,
implementation
1400
x2858
41E
3-cycles
constructive algorithms
,
graphs
,
greedy
1900
x1978
41D
Pawn
dp
1900
x2430
41C
Email address
expression parsing
,
implementation
1300
x3766
41B
Martian Dollar
brute force
1400
x4054
40B
Repaintings
math
1600
x1173
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x4052
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x3000
39H
Multiplication Table
implementation
1300
x2774
39F
Pacifist frogs
implementation
1300
x1573
39B
Company Income Growth
greedy
1300
x2681
38E
Let's Go Rolling!
dp
,
sortings
1800
x2588
38D
Vasya the Architect
implementation
1900
x499
38C
Blinds
brute force
1400
x2184
37C
Old Berland Language
data structures
,
greedy
,
trees
1900
x1733
37B
Computer Game
greedy
,
implementation
1800
x924
36B
Fractal
implementation
1600
x1511
36A
Extra-terrestrial Intelligence
implementation
1300
x3025
35D
Animals
dp
,
greedy
1700
x3362
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6917
35B
Warehouse
implementation
1700
x1022
34D
Road Map
dfs and similar
,
graphs
1600
x5215
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4249
33C
Wonderful Randomized Sum
greedy
1800
x3027
33B
String Problem
shortest paths
1800
x4602
32D
Constellation
implementation
1600
x1288
32C
Flea
math
1700
x2173
31C
Schedule
implementation
1700
x1825
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4345
30C
Shooting Gallery
dp
,
probabilities
1800
x1972
30B
Codeforces World Finals
implementation
1700
x1202
30A
Accounting
brute force
,
math
1400
x3481
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4996
29B
Traffic Lights
implementation
1500
x2989
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4707
28A
Bender Problem
implementation
1600
x801
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2814
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5384
26B
Regular Bracket Sequence
greedy
1400
x19710
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x11535
25C
Roads in Berland
graphs
,
shortest paths
1900
x6387
25A
IQ test
brute force
1300
x87153
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1263
24B
F1 Champions
implementation
1500
x1784
24A
Ring road
graphs
1400
x5226
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3378
22D
Segments
greedy
,
sortings
1900
x2754
22C
System Administrator
graphs
1700
x3147
22B
Bargaining Table
brute force
,
dp
1500
x4244
21A
Jabber ID
implementation
,
strings
1900
x1885
20C
Dijkstra?
graphs
,
shortest paths
1900
x33260
20A
BerOS file system
implementation
1700
x6240
19B
Checkout Assistant
dp
1900
x4848
19A
World Football Cup
implementation
1400
x2764
18B
Platforms
brute force
,
math
1700
x2152
18A
Triangle
brute force
,
geometry
1500
x6072
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4891
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x5176
16D
Logging
implementation
,
strings
1900
x1612
16C
Monitor
binary search
,
number theory
1800
x4790
15B
Laser
math
1800
x1474
14E
Camels
dp
1900
x1716
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4590
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3402
←
1
2
...
29
30
31
32
→
User lists
Name