Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round 987 (Div. 2)
31:23:20
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
1999E
Triple Operations
dp
,
implementation
,
math
1300
x18572
1999D
Slavic's Exam
greedy
,
implementation
,
strings
1100
x26849
1999C
Showering
greedy
,
implementation
800
x34894
1999B
Card Game
brute force
,
constructive algorithms
,
implementation
1000
x32197
1999A
A+B Again?
implementation
,
math
800
x54544
1998E2
Eliminating Balls With Merging (Hard Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
2500
x689
1998E1
Eliminating Balls With Merging (Easy Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
2200
x1827
1998D
Determine Winning Islands in Race
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
2100
x3297
1998C
Perform Operations to Maximize Score
binary search
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x6105
1998B
Minimize Equal Sum Subarrays
constructive algorithms
,
math
,
number theory
1000
x23644
1998A
Find K Distinct Points with Fixed Center
constructive algorithms
,
implementation
,
math
800
x23856
1997F
Chips on a Line
brute force
,
combinatorics
,
dp
,
greedy
,
math
2700
x898
1997E
Level Up
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
2200
x3118
1997D
Maximize the Root
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1500
x12460
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x21932
1997B
Make Three Regions
constructive algorithms
,
two pointers
1100
x20582
1997A
Strong Password
brute force
,
implementation
,
strings
800
x28925
1996G
Penacony
brute force
,
data structures
,
graphs
,
greedy
,
hashing
2200
x1758
1996F
Bomb
binary search
,
greedy
,
math
1900
x4745
1996E
Decode
combinatorics
,
data structures
,
implementation
,
math
1600
x9752
1996D
Fun
binary search
,
brute force
,
combinatorics
,
math
,
number theory
1500
x15904
1996C
Sort
dp
,
greedy
,
sortings
,
strings
1200
x22827
1996B
Scale
greedy
,
implementation
800
x32460
1996A
Legs
binary search
,
math
,
ternary search
800
x42975
1995E2
Let Me Teach You a Lesson (Hard Version)
data structures
,
dp
,
matrices
,
two pointers
2900
x300
1995E1
Let Me Teach You a Lesson (Easy Version)
2-sat
,
data structures
,
dp
,
matrices
,
two pointers
2700
x379
1995D
Cases
bitmasks
,
brute force
,
dp
,
strings
2300
x2354
1995C
Squaring
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
number theory
1800
x8546
1995B2
Bouquet (Hard Version)
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1700
x8755
1995B1
Bouquet (Easy Version)
binary search
,
brute force
,
greedy
,
sortings
,
two pointers
1100
x17930
1995A
Diagonals
brute force
,
greedy
,
implementation
,
math
800
x24171
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
3500
x704
1994G
Minecraft
bitmasks
,
brute force
,
dp
,
graphs
,
math
2600
x1263
1994F
Stardew Valley
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x1201
1994E
Wooden Game
bitmasks
,
greedy
,
math
,
trees
2000
x4494
1994D
Funny Game
constructive algorithms
,
dsu
,
graphs
,
greedy
,
math
,
number theory
,
trees
1900
x5741
1994C
Hungry Games
binary search
,
dp
,
two pointers
1600
x10737
1994B
Fun Game
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x16509
1994A
Diverse Game
constructive algorithms
,
greedy
,
implementation
800
x20177
1993F2
Dyn-scripted Robot (Hard Version)
chinese remainder theorem
,
math
,
number theory
2800
x413
1993F1
Dyn-scripted Robot (Easy Version)
brute force
,
chinese remainder theorem
,
constructive algorithms
,
math
,
number theory
2400
x993
1993E
Xor-Grid Problem
bitmasks
,
constructive algorithms
,
dp
,
implementation
2700
x538
1993D
Med-imize
binary search
,
dp
,
greedy
2200
x3735
1993C
Light Switches
implementation
,
math
1400
x13584
1993B
Parity and Sum
constructive algorithms
,
greedy
1100
x22671
1993A
Question Marks
greedy
,
implementation
800
x29311
1992G
Ultra-Meow
combinatorics
,
dp
,
math
2000
x3124
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x5745
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x9131
1992D
Test of Love
dp
,
greedy
,
implementation
1200
x20356
1992C
Gorilla and Permutation
constructive algorithms
,
math
900
x29023
1992B
Angry Monk
greedy
,
math
,
sortings
800
x34212
1992A
Only Pluses
brute force
,
constructive algorithms
,
greedy
,
math
,
sortings
800
x41118
1991I
Grid Game
constructive algorithms
,
games
,
graph matchings
,
greedy
,
interactive
3500
x130
1991H
Prime Split Game
bitmasks
,
dp
,
fft
,
games
,
math
,
number theory
3300
x503
1991G
Grid Reset
constructive algorithms
,
greedy
,
implementation
2700
x610
1991F
Triangle Formation
brute force
,
greedy
,
implementation
,
math
,
sortings
2200
x2320
1991E
Coloring Game
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
interactive
1900
x4214
1991D
Prime XOR Coloring
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
math
,
number theory
1900
x6653
1991C
Absolute Zero
constructive algorithms
,
greedy
,
math
1300
x14538
1991B
AND Reconstruction
bitmasks
,
constructive algorithms
,
greedy
1100
x16307
1991A
Maximize the Last Element
greedy
,
implementation
800
x21768
1990F
Polygonal Segments
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
two pointers
2800
x292
1990E2
Catch the Mole(Hard Version)
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
interactive
,
trees
2600
x864
1990E1
Catch the Mole(Easy Version)
binary search
,
data structures
,
dfs and similar
,
interactive
,
trees
2500
x923
1990D
Grid Puzzle
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
1800
x6287
1990C
Mad MAD Sum
brute force
,
greedy
,
math
1500
x11591
1990B
Array Craft
constructive algorithms
,
greedy
1200
x16476
1990A
Submission Bait
brute force
,
games
,
greedy
,
sortings
900
x22620
1989F
Simultaneous Coloring
dfs and similar
,
divide and conquer
,
graphs
3000
x449
1989E
Distance to Different
combinatorics
,
dp
,
math
2300
x1983
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5951
1989C
Two Movies
greedy
,
math
1400
x18468
1989B
Substring and Subsequence
brute force
,
greedy
,
strings
1200
x20116
1989A
Catch the Coin
implementation
800
x26324
1988F
Heartbeat
combinatorics
,
dp
,
fft
,
math
3000
x207
1988E
Range Minimum Sum
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
2300
x1424
1988D
The Omnipotent Monster Killer
brute force
,
dfs and similar
,
dp
,
trees
2000
x4919
1988C
Increasing Sequence with Fixed OR
bitmasks
,
constructive algorithms
,
greedy
1300
x16565
1988B
Make Majority
greedy
,
implementation
900
x22717
1988A
Split the Multiset
brute force
,
greedy
,
implementation
,
math
900
x23173
1987H
Fumo Temple
interactive
3500
x102
1987G2
Spinning Round (Hard Version)
divide and conquer
,
dp
,
trees
3500
x173
1987G1
Spinning Round (Easy Version)
divide and conquer
,
dp
,
trees
2900
x274
1987F2
Interesting Problem (Hard Version)
dp
2600
x1018
1987F1
Interesting Problem (Easy Version)
dp
2500
x1119
1987E
Wonderful Tree!
brute force
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2000
x3392
1987D
World is Mine
dp
,
games
1800
x7158
1987C
Basil's Garden
dp
,
greedy
1200
x17330
1987B
K-Sort
greedy
1000
x20431
1987A
Upload More RAM
greedy
,
math
800
x25321
1986G2
Permutation Problem (Hard Version)
brute force
,
data structures
,
hashing
,
math
,
number theory
2500
x1085
1986G1
Permutation Problem (Simple Version)
binary search
,
brute force
,
combinatorics
,
data structures
,
math
,
number theory
2200
x1492
1986F
Non-academic Problem
dfs and similar
,
graphs
,
trees
1900
x4560
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x8811
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x15200
1986C
Update Queries
data structures
,
greedy
,
sortings
1100
x22816
1986B
Matrix Stabilization
brute force
,
data structures
,
greedy
,
sortings
1000
x26572
1986A
X Axis
brute force
,
geometry
,
math
,
sortings
800
x40417
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
2200
x1531
←
1
2
3
4
5
...
96
97
→
User lists
Name