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Codeforces Round 937 (Div. 4)
01:14:32
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Difficulty:
—
greedy
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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Problems
#
Name
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x257
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x262
1452F
Divide Powers
constructive algorithms
,
greedy
2900
x295
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x303
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x325
1051G
Distinctification
data structures
,
dsu
,
greedy
2900
x340
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x349
1487F
Ones
dp
,
greedy
,
shortest paths
2900
x356
1738G
Anti-Increasing Addicts
constructive algorithms
,
dp
,
greedy
,
math
2900
x365
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x383
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x384
1601E
Phys Ed Online
data structures
,
dp
,
greedy
2900
x459
725F
Family Photos
games
,
greedy
2900
x478
321D
Ciel and Flipboard
dp
,
greedy
,
math
2900
x524
1428G1
Lucky Numbers (Easy Version)
dp
,
greedy
2900
x538
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x665
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x745
1768F
Wonderful Jump
dp
,
greedy
2900
x754
1198F
GCD Groups 2
greedy
,
number theory
,
probabilities
2900
x803
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x949
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1091
724E
Goods transportation
dp
,
flows
,
greedy
2900
x1194
505E
Mr. Kitayuta vs. Bamboos
binary search
,
greedy
2900
x1316
48F
Snow sellers
greedy
,
sortings
2800
x122
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x123
859F
Ordering T-Shirts
greedy
2800
x158
796F
Sequence Recovery
bitmasks
,
data structures
,
greedy
2800
x167
581E
Kojiro and Furrari
dp
,
greedy
2800
x184
1884E
Hard Design
greedy
,
implementation
,
math
2800
x253
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x292
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x311
625E
Frog Fights
data structures
,
greedy
2800
x321
1776D
Teamwork
constructive algorithms
,
greedy
,
math
2800
x328
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x329
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x343
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x363
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x365
1455F
String and Operations
dp
,
greedy
2800
x413
1852D
Miriany and Matchstick
constructive algorithms
,
dp
,
greedy
2800
x415
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x455
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x501
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x551
639E
Bear and Paradox
binary search
,
greedy
,
math
,
sortings
2800
x560
1620F
Bipartite Array
dp
,
greedy
2800
x563
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x595
1383D
Rearrange
brute force
,
constructive algorithms
,
graphs
,
greedy
,
sortings
2800
x629
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x649
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x663
360E
Levko and Game
graphs
,
greedy
,
shortest paths
2800
x672
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x681
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x708
1208G
Polygons
greedy
,
math
,
number theory
2800
x718
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x741
1693D
Decinc Dividing
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
2800
x757
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x792
1635F
Closest Pair
data structures
,
greedy
2800
x971
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1022
521D
Shop
greedy
2800
x1474
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x1896
1910G
Pool Records
*special problem
,
greedy
2700
x48
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x119
717B
R3D3’s Summer Adventure
dp
,
greedy
2700
x134
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x282
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x293
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x307
191D
Metro Scheme
graphs
,
greedy
2700
x340
1238G
Adilbek and the Watering System
data structures
,
greedy
,
sortings
2700
x386
183D
T-shirt
dp
,
greedy
,
probabilities
2700
x388
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x390
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x393
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x401
1214F
Employment
greedy
,
sortings
2700
x421
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x430
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x440
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x447
833C
Ever-Hungry Krakozyabra
brute force
,
combinatorics
,
greedy
,
math
2700
x455
938F
Erasing Substrings
bitmasks
,
dp
,
greedy
2700
x463
623D
Birthday
greedy
,
math
,
probabilities
2700
x465
1137E
Train Car Selection
data structures
,
greedy
2700
x481
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x504
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x517
1461F
Mathematical Expression
constructive algorithms
,
dp
,
greedy
2700
x521
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x526
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x534
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x548
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x551
578E
Walking!
constructive algorithms
,
greedy
2700
x603
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x612
1521E
Nastia and a Beautiful Matrix
binary search
,
constructive algorithms
,
dp
,
greedy
2700
x638
1658F
Juju and Binary String
brute force
,
constructive algorithms
,
greedy
,
math
2700
x712
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x717
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x727
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x740
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x768
578D
LCS Again
dp
,
greedy
2700
x771
1672H
Zigu Zagu
constructive algorithms
,
data structures
,
greedy
2700
x901
356D
Bags and Coins
bitmasks
,
constructive algorithms
,
dp
,
greedy
2700
x924
1344D
Résumé Review
binary search
,
greedy
,
math
2700
x939
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1029
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1288
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