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Before contest
Codeforces Round 941 (Div. 1)
12:36:17
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Before contest
Codeforces Round 941 (Div. 2)
12:36:15
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dsu
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
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x6910
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x686
433D
Nanami's Digital Board
dsu
,
implementation
2000
x1036
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1270
187C
Weak Memory
dfs and similar
,
dsu
2000
x1297
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1748
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2258
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2732
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2795
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2859
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2903
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3022
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3113
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x3260
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3535
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3646
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3655
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3791
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4050
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4779
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5019
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x5772
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6191
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9112
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2244
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x2303
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2331
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2887
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x2986
566D
Restructuring Company
data structures
,
dsu
1900
x3087
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3091
437D
The Child and Zoo
dsu
,
sortings
1900
x3132
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3183
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3254
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3312
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3589
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3646
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3687
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3726
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4383
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4663
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x4989
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5055
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5144
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5515
1095F
Make It Connected
dsu
,
graphs
,
greedy
1900
x5829
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x6867
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x6954
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x7733
547B
Mike and Feet
binary search
,
data structures
,
dp
,
dsu
1900
x8190
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10292
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1135
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2533
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2578
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x3875
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x3880
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4297
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4911
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5302
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5752
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6509
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6593
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7284
765D
Artsem and Saunders
constructive algorithms
,
dsu
,
math
1700
x2440
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3139
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5281
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5601
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x6203
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6520
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7072
1850H
The Third Letter
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1700
x7450
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7459
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7755
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8377
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x8796
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x8821
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10226
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10411
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x16090
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4391
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5136
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6766
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6802
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x6899
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7098
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7295
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8683
722C
Destroying Array
data structures
,
dsu
1600
x8802
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10080
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10198
1702E
Split Into Two Sets
dfs and similar
,
dsu
,
graphs
1600
x12265
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2425
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2439
1575J
Jeopardy of Dropped Balls
binary search
,
brute force
,
dsu
,
implementation
1500
x3639
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4458
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5114
490B
Queue
dsu
,
implementation
1500
x5896
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8511
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8656
1675E
Replace With the Previous, Minimize
dsu
,
greedy
,
strings
1500
x10062
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