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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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→ Filter Problems
Difficulty:
—
implementation
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
391A
Genetic Engineering
implementation
,
two pointers
x1698
507D
The Maths Lecture
dp
,
implementation
2200
x1676
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1675
1662D
Evolution of Weasels
greedy
,
implementation
,
strings
x1671
909D
Colorful Points
data structures
,
greedy
,
implementation
2100
x1670
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1669
910B
Door Frames
greedy
,
implementation
1600
x1669
413B
Spyke Chatting
implementation
1300
x1668
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1662
1580C
Train Maintenance
brute force
,
data structures
,
implementation
2200
x1651
76E
Points
implementation
,
math
1700
x1650
551E
GukiZ and GukiZiana
binary search
,
data structures
,
implementation
2500
x1647
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1644
1236D
Alice and the Doll
brute force
,
data structures
,
greedy
,
implementation
2300
x1642
95A
Hockey
implementation
,
strings
1600
x1640
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x1635
958A1
Death Stars (easy)
implementation
1400
x1634
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1632
656B
Scrambled
*special problem
,
implementation
1700
x1628
63C
Bulls and Cows
brute force
,
implementation
1700
x1624
653C
Bear and Up-Down
brute force
,
implementation
1900
x1622
1610E
AmShZ and G.O.A.T.
binary search
,
brute force
,
greedy
,
implementation
,
math
2300
x1621
819B
Mister B and PR Shifts
data structures
,
implementation
,
math
1900
x1620
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1614
1120A
Diana and Liana
greedy
,
implementation
,
two pointers
1900
x1613
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1595
84C
Biathlon
binary search
,
implementation
1700
x1584
992D
Nastya and a Game
brute force
,
implementation
,
math
2100
x1579
958F1
Lightsabers (easy)
implementation
1500
x1579
703C
Chris and Road
geometry
,
implementation
2100
x1579
770D
Draw Brackets!
*special problem
,
implementation
1400
x1567
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1557
883H
Palindromic Cut
brute force
,
implementation
,
strings
1800
x1551
730A
Toda 2
greedy
,
implementation
1800
x1548
317B
Ants
brute force
,
implementation
2000
x1541
520D
Cubes
games
,
greedy
,
implementation
2100
x1530
1910A
Username
*special problem
,
implementation
1100
x1523
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1520
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1520
130A
Hexagonal numbers
*special problem
,
implementation
900
x1517
1080D
Olya and magical square
constructive algorithms
,
implementation
,
math
2000
x1514
490E
Restoring Increasing Sequence
binary search
,
brute force
,
greedy
,
implementation
2000
x1513
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1513
234D
Cinema
implementation
1600
x1513
5D
Follow Traffic Rules
implementation
,
math
2100
x1512
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1504
16D
Logging
implementation
,
strings
1900
x1502
847I
Noise Level
dfs and similar
,
implementation
,
math
1900
x1498
1329C
Drazil Likes Heap
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1497
995A
Tesla
constructive algorithms
,
implementation
2100
x1497
837E
Vasya's Function
binary search
,
implementation
,
math
2100
x1491
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1488
847K
Travel Cards
greedy
,
implementation
,
sortings
1800
x1480
39F
Pacifist frogs
implementation
1300
x1475
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1474
452D
Washer, Dryer, Folder
greedy
,
implementation
1900
x1470
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1450
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1444
1531A
Зингер | color
*special problem
,
implementation
x1443
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1443
723F
st-Spanning Tree
dsu
,
graphs
,
greedy
,
implementation
2300
x1437
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1433
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1430
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1424
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1421
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1416
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1408
36B
Fractal
implementation
1600
x1399
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1398
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1395
524A
Возможно, вы знаете этих людей?
implementation
1600
x1392
427E
Police Patrol
greedy
,
implementation
,
math
,
ternary search
2000
x1391
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1387
1004D
Sonya and Matrix
brute force
,
constructive algorithms
,
implementation
2300
x1387
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1382
550E
Brackets in Implications
constructive algorithms
,
greedy
,
implementation
,
math
2200
x1375
1650F
Vitaly and Advanced Useless Algorithms
dp
,
greedy
,
implementation
2200
x1370
1244F
Chips
constructive algorithms
,
implementation
2300
x1361
53B
Blog Photo
binary search
,
implementation
1700
x1360
175B
Plane of Tanks: Pro
implementation
1400
x1358
239B
Easy Tape Programming
brute force
,
implementation
1500
x1355
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1347
908F
New Year and Rainbow Roads
graphs
,
greedy
,
implementation
2400
x1345
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1335
331A1
Oh Sweet Beaverette
brute force
,
implementation
1400
x1332
303B
Rectangle Puzzle II
implementation
,
math
1700
x1329
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1318
461C
Appleman and a Sheet of Paper
data structures
,
implementation
2200
x1308
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1307
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1305
1239C
Queue in the Train
data structures
,
greedy
,
implementation
2300
x1304
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1297
21B
Intersection
implementation
,
math
2000
x1296
1385G
Columns Swaps
2-sat
,
dfs and similar
,
dsu
,
graphs
,
implementation
2300
x1294
106D
Treasure Island
brute force
,
implementation
1700
x1289
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1287
762D
Maximum path
dp
,
greedy
,
implementation
2300
x1282
286C
Main Sequence
greedy
,
implementation
2100
x1282
734F
Anton and School
bitmasks
,
constructive algorithms
,
implementation
,
math
2500
x1275
139B
Wallpaper
implementation
,
math
1600
x1270
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