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Before contest
Codeforces Round 941 (Div. 1)
13:16:17
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Before contest
Codeforces Round 941 (Div. 2)
13:16:17
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data structures
combine-tags-by-or
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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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Problems
#
Name
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1710
1028D
Order book
combinatorics
,
data structures
,
greedy
2100
x1708
1062E
Company
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
2300
x1702
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1696
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1696
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1681
1110F
Nearest Leaf
data structures
,
trees
2600
x1675
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1674
909D
Colorful Points
data structures
,
greedy
,
implementation
2100
x1672
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1667
1268C
K Integers
binary search
,
data structures
2300
x1664
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1659
893F
Subtree Minimum Query
data structures
,
trees
2300
x1657
1580C
Train Maintenance
brute force
,
data structures
,
implementation
2200
x1655
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1652
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1649
551E
GukiZ and GukiZiana
binary search
,
data structures
,
implementation
2500
x1648
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1646
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1645
1236D
Alice and the Doll
brute force
,
data structures
,
greedy
,
implementation
2300
x1644
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1643
1039D
You Are Given a Tree
data structures
,
dp
,
trees
2800
x1643
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x1639
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1631
819B
Mister B and PR Shifts
data structures
,
implementation
,
math
1900
x1620
1373F
Network Coverage
binary search
,
constructive algorithms
,
data structures
,
greedy
2400
x1618
442C
Artem and Array
data structures
,
greedy
2500
x1618
1593G
Changing Brackets
constructive algorithms
,
data structures
,
dp
,
greedy
2200
x1612
827C
DNA Evolution
data structures
,
strings
2100
x1612
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1608
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1605
121E
Lucky Array
data structures
2400
x1605
1446D1
Frequency Problem (Easy Version)
data structures
,
greedy
2600
x1603
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1603
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1602
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1596
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1594
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1582
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1574
899F
Letters Removing
data structures
,
strings
2100
x1571
1468A
LaIS
data structures
,
dp
,
greedy
2200
x1563
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1560
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1559
1399F
Yet Another Segments Subset
data structures
,
dp
,
graphs
,
sortings
2300
x1554
916E
Jamie and Tree
data structures
,
trees
2400
x1551
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1546
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1544
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1540
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1536
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1527
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1524
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1524
1304F1
Animal Observation (easy version)
data structures
,
dp
2300
x1522
1045G
AI robots
data structures
2200
x1521
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1520
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1519
396C
On Changing Tree
data structures
,
graphs
,
trees
x1519
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1519
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1517
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1511
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1508
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1505
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1505
594D
REQ
data structures
,
number theory
2500
x1504
1329C
Drazil Likes Heap
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1502
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1499
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1498
538F
A Heap of Heaps
brute force
,
data structures
,
math
,
sortings
2200
x1495
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1493
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1491
37C
Old Berland Language
data structures
,
greedy
,
trees
1900
x1490
1093E
Intersection of Permutations
data structures
2400
x1482
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1477
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1473
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1465
869E
The Untended Antiquity
data structures
,
hashing
2400
x1465
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1464
1276C
Beautiful Rectangle
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
greedy
,
math
2300
x1463
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1455
1444C
Team-Building
data structures
,
dfs and similar
,
dsu
,
graphs
2500
x1454
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1454
1197E
Culture Code
binary search
,
combinatorics
,
data structures
,
dp
,
shortest paths
,
sortings
2300
x1452
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1449
316E1
Summer Homework
brute force
,
data structures
1500
x1447
1852C
Ina of the Mountain
data structures
,
dp
,
greedy
,
math
2400
x1445
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1440
748E
Santa Claus and Tangerines
binary search
,
data structures
,
greedy
,
two pointers
2100
x1440
1041F
Ray in the tube
data structures
,
divide and conquer
,
dp
,
math
2500
x1438
610D
Vika and Segments
constructive algorithms
,
data structures
,
geometry
,
two pointers
2300
x1434
1167F
Scalar Queries
combinatorics
,
data structures
,
math
,
sortings
2300
x1431
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1429
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1421
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1418
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1417
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1407
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1394
739C
Alyona and towers
data structures
2500
x1391
500E
New Year Domino
data structures
,
dp
,
dsu
2300
x1389
862E
Mahmoud and Ehab and the function
binary search
,
data structures
,
sortings
2100
x1388
853C
Boredom
data structures
2100
x1387
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