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Before contest
Codeforces Round (Div. 2)
6 days
→ 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
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Status
Standings
Custom test
Problems
#
Name
1301D
Time to Run
constructive algorithms
,
graphs
,
implementation
2000
x4009
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9346
1301B
Motarack's Birthday
binary search
,
greedy
,
ternary search
1500
x14237
1301A
Three Strings
implementation
,
strings
800
x19380
1300B
Assigning to Classes
greedy
,
implementation
,
sortings
1000
x23472
1300A
Non-zero
implementation
,
math
800
x21013
1299E
So Mean
interactive
,
math
3400
x164
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x440
1299C
Water Balance
data structures
,
geometry
,
greedy
2100
x3946
1299B
Aerodynamic
geometry
1800
x5249
1299A
Anu Has a Function
brute force
,
greedy
,
math
1500
x12036
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2892
1296E2
String Coloring (hard version)
data structures
,
dp
2000
x5042
1296E1
String Coloring (easy version)
constructive algorithms
,
dp
,
graphs
,
greedy
,
sortings
1800
x7488
1296D
Fight with Monsters
greedy
,
sortings
1500
x14262
1296C
Yet Another Walking Robot
data structures
,
implementation
1500
x14826
1296B
Food Buying
math
900
x30224
1296A
Array with Odd Sum
math
800
x41773
1295F
Good Contest
combinatorics
,
dp
,
probabilities
2700
x1243
1295E
Permutation Separation
data structures
,
divide and conquer
2200
x2535
1295D
Same GCDs
math
,
number theory
1800
x8910
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12922
1295B
Infinite Prefixes
math
,
strings
1700
x9309
1295A
Display The Number
greedy
900
x22829
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5792
1294E
Obtain a Permutation
greedy
,
implementation
,
math
1900
x4923
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x11749
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x34824
1294B
Collecting Packages
implementation
,
sortings
1200
x21822
1294A
Collecting Coins
math
800
x46840
1293B
JOE is on TV!
combinatorics
,
greedy
,
math
1000
x21213
1293A
ConneR and the A.R.C. Markland-N
binary search
,
brute force
,
implementation
1100
x15413
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x311
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x353
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x811
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x2066
1292B
Aroma's Search
brute force
,
constructive algorithms
,
geometry
,
greedy
,
implementation
1700
x6368
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x13354
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x662
1291B
Array Sharpening
greedy
,
implementation
1300
x14175
1291A
Even But Not Even
greedy
,
math
,
strings
900
x19565
1290F
Making Shapes
dp
3500
x380
1290E
Cartesian Tree
data structures
3300
x549
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x828
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1733
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5440
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8569
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x515
1288E
Messenger Simulator
data structures
2000
x3589
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x7189
1288C
Two Arrays
combinatorics
,
dp
1600
x12900
1288B
Yet Another Meme Problem
math
1100
x17058
1288A
Deadline
binary search
,
brute force
,
math
,
ternary search
1100
x18292
1287B
Hyperset
brute force
,
data structures
,
implementation
1500
x9443
1287A
Angry Students
greedy
,
implementation
800
x20598
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x244
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x518
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x593
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x649
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1436
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4712
1286A
Garland
dp
,
greedy
,
sortings
1800
x8818
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x1149
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1838
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7725
1285C
Fadi and LCM
brute force
,
math
,
number theory
1400
x23506
1285B
Just Eat It!
dp
,
greedy
,
implementation
1300
x22718
1285A
Mezo Playing Zoma
math
800
x28089
1284G
Seollal
graphs
3300
x174
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x323
1284E
New Year and Castle Construction
combinatorics
,
geometry
,
math
,
sortings
2500
x1302
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x3160
1284C
New Year and Permutation
combinatorics
,
math
1600
x8037
1284B
New Year and Ascent Sequence
binary search
,
combinatorics
,
data structures
,
dp
,
implementation
,
sortings
1400
x10835
1284A
New Year and Naming
implementation
,
strings
800
x18010
1283F
DIY Garland
constructive algorithms
,
greedy
,
trees
2200
x1858
1283E
New Year Parties
dp
,
greedy
1800
x6551
1283D
Christmas Trees
graphs
,
greedy
,
shortest paths
1800
x7796
1283C
Friends and Gifts
constructive algorithms
,
data structures
,
math
1500
x13145
1283B
Candies Division
math
900
x21668
1283A
Minutes Before the New Year
math
800
x49937
1282E
The Cake Is a Lie
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
2400
x1146
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2238
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4312
1282B2
K for the Price of One (Hard Version)
dp
,
greedy
,
sortings
1600
x10193
1282B1
K for the Price of One (Easy Version)
dp
,
greedy
,
sortings
1400
x11491
1282A
Temporarily unavailable
implementation
,
math
900
x14795
1281B
Azamon Web Services
greedy
1600
x8296
1281A
Suffix Three
implementation
800
x17948
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x62
1280E
Kirchhoff's Current Loss
math
2900
x202
1280D
Miss Punyverse
dp
,
greedy
,
trees
2500
x1010
1280C
Jeremy Bearimy
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2682
1280B
Beingawesomeism
implementation
,
math
1800
x3943
1280A
Cut and Paste
implementation
,
math
1700
x5409
1279F
New Year and Handle Change
binary search
,
dp
2800
x887
1279E
New Year Permutations
combinatorics
,
dp
2700
x377
1279D
Santa's Bot
combinatorics
,
math
,
probabilities
1700
x6336
1279C
Stack of Presents
data structures
,
implementation
1400
x11700
1279B
Verse For Santa
binary search
,
brute force
,
implementation
1300
x13663
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