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Before contest
Codeforces Round (Div. 1)
4 days
Before contest
Codeforces Round (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
data structures
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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Custom test
Problems
#
Name
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x501
1340A
Nastya and Strange Generator
brute force
,
data structures
,
greedy
,
implementation
1500
x13391
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x206
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x2178
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x8315
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10807
1334F
Strange Function
binary search
,
data structures
,
dp
,
greedy
2500
x1291
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12525
1332G
No Monotone Triples
data structures
3100
x295
1329D
Dreamoon Likes Strings
constructive algorithms
,
data structures
3100
x393
1329C
Drazil Likes Heap
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1703
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1643
1326E
Bombs
data structures
,
two pointers
2400
x2178
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x27897
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x27729
1322E
Median Mountain Range
data structures
3300
x300
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x4181
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x804
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1494
1320C
World of Darkraft: Battle for Azathoth
brute force
,
data structures
,
sortings
2000
x3085
1320A
Journey Planning
data structures
,
dp
,
greedy
,
math
,
sortings
1400
x16172
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x800
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x532
1313C2
Skyscrapers (hard version)
data structures
,
dp
,
greedy
1900
x6434
1313C1
Skyscrapers (easy version)
brute force
,
data structures
,
dp
,
greedy
1500
x10376
1312G
Autocompletion
data structures
,
dfs and similar
,
dp
2600
x979
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x4214
1310A
Recommendations
data structures
,
greedy
,
sortings
1700
x5158
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6310
1304F2
Animal Observation (hard version)
data structures
,
dp
,
greedy
2400
x1509
1304F1
Animal Observation (easy version)
data structures
,
dp
2300
x1746
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x5178
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x782
1302C
Segment tree or Fenwick?
data structures
x382
1301E
Nanosoft
binary search
,
data structures
,
dp
,
implementation
2500
x1494
1299C
Water Balance
data structures
,
geometry
,
greedy
2100
x3899
1297I
Falling Blocks
*special problem
,
data structures
x31
1297F
Movie Fan
*special problem
,
data structures
,
greedy
,
implementation
,
sortings
x117
1296E2
String Coloring (hard version)
data structures
,
dp
2000
x4995
1296C
Yet Another Walking Robot
data structures
,
implementation
1500
x14760
1295E
Permutation Separation
data structures
,
divide and conquer
2200
x2518
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x11679
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x13289
1290E
Cartesian Tree
data structures
3300
x537
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5317
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8543
1288E
Messenger Simulator
data structures
2000
x3553
1287B
Hyperset
brute force
,
data structures
,
implementation
1500
x9413
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x511
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x575
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4664
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1822
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x317
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x3145
1284B
New Year and Ascent Sequence
binary search
,
combinatorics
,
data structures
,
dp
,
implementation
,
sortings
1400
x10807
1283C
Friends and Gifts
constructive algorithms
,
data structures
,
math
1500
x13084
1282E
The Cake Is a Lie
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
2400
x1139
1279C
Stack of Presents
data structures
,
implementation
1400
x11656
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3947
1278C
Berry Jam
data structures
,
dp
,
greedy
,
implementation
1700
x7949
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x3109
1276C
Beautiful Rectangle
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
greedy
,
math
2300
x1652
1271D
Portals
data structures
,
dp
,
greedy
,
implementation
,
sortings
2100
x3006
1270H
Number of Components
data structures
3300
x699
1268C
K Integers
binary search
,
data structures
2300
x1702
1266E
Spaceship Solitaire
data structures
,
greedy
,
implementation
2100
x2227
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3608
1265E
Beautiful Mirrors
data structures
,
dp
,
math
,
probabilities
2100
x3615
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12541
1264C
Beautiful Mirrors with queries
data structures
,
probabilities
2400
x1137
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x865
1263E
Editor
data structures
,
implementation
2100
x2768
1260F
Colored Tree
data structures
,
trees
2700
x534
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4202
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7515
1254D
Tree Queries
data structures
,
probabilities
,
trees
2700
x1204
1253E
Antenna Coverage
data structures
,
dp
,
greedy
,
sortings
2200
x2802
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1844
1252G
Performance Review
data structures
2100
x1413
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x341
1252C
Even Path
data structures
,
implementation
1600
x3706
1251E2
Voting (Hard Version)
binary search
,
data structures
,
greedy
2400
x2607
1251E1
Voting (Easy Version)
data structures
,
dp
,
greedy
2300
x2311
1250C
Trip to Saint Petersburg
data structures
2100
x1302
1249D2
Too Many Segments (hard version)
data structures
,
greedy
,
sortings
1800
x5202
1239C
Queue in the Train
data structures
,
greedy
,
implementation
2300
x1331
1238G
Adilbek and the Watering System
data structures
,
greedy
,
sortings
2700
x405
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x122
1237D
Balanced Playlist
binary search
,
data structures
,
implementation
2000
x4156
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x15715
1236E
Alice and the Unfair Game
binary search
,
data structures
,
dp
,
dsu
2500
x652
1236D
Alice and the Doll
brute force
,
data structures
,
greedy
,
implementation
2300
x1661
1234D
Distinct Characters Queries
data structures
1600
x14807
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16829
1227D2
Optimal Subsequences (Hard Version)
data structures
,
greedy
1800
x4310
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6378
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x2020
1221F
Choose a Square
binary search
,
data structures
,
sortings
2400
x1036
1220F
Gardener Alex
binary search
,
data structures
2700
x682
1218F
Workout plan
data structures
,
greedy
1500
x2919
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