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Educational Codeforces Round 165 (Rated for Div. 2)
31:26:44
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Difficulty:
—
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
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x3889
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x3875
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3810
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3727
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3721
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3695
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3656
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3647
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3646
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3640
1575J
Jeopardy of Dropped Balls
binary search
,
brute force
,
dsu
,
implementation
1500
x3639
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3589
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3577
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3535
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3312
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x3260
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3254
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3231
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3184
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3139
437D
The Child and Zoo
dsu
,
sortings
1900
x3132
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3118
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3104
566D
Restructuring Company
data structures
,
dsu
1900
x3088
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3028
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x2989
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2958
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2906
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2891
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2860
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2795
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2790
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2741
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2734
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2640
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2578
1108F
MST Unification
binary search
,
dsu
,
graphs
,
greedy
2100
x2548
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2540
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2533
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2523
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2489
765D
Artsem and Saunders
constructive algorithms
,
dsu
,
math
1700
x2441
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2441
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2427
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2427
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2355
1537F
Figure Fixing
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
2200
x2353
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2352
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2349
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2340
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2333
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2329
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2319
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x2304
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2301
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2279
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2259
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2244
891C
Envy
data structures
,
dsu
,
graphs
2300
x2212
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2186
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2161
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2055
506D
Mr. Kitayuta's Colorful Graph
brute force
,
dfs and similar
,
dsu
,
graphs
2400
x2025
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1960
896E
Welcome home, Chtholly
data structures
,
dsu
3100
x1960
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1947
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1939
715C
Digit Tree
dfs and similar
,
divide and conquer
,
dsu
,
trees
2700
x1917
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x1910
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1874
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1836
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1834
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1802
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1779
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1748
1691E
Number of Groups
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2300
x1742
553C
Love Triangles
dfs and similar
,
dsu
,
graphs
2200
x1726
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1720
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1720
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1682
1844E
Great Grids
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2400
x1680
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1680
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1656
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1641
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1598
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1588
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1582
1253F
Cheap Robot
binary search
,
dsu
,
graphs
,
shortest paths
,
trees
2500
x1574
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1532
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1528
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1510
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1504
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1492
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1473
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1456
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
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1449
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1440
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1440
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