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Educational Codeforces Round 165 (Rated for Div. 2)
39:09:26
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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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Problems
#
Name
332E
Binary Key
dp
,
greedy
,
implementation
2400
x294
32E
Hide-and-Seek
geometry
,
implementation
2400
x321
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x332
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x341
277C
Game
games
,
implementation
2400
x446
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x475
380B
Sereja and Tree
graphs
,
implementation
2400
x527
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x560
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x615
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x623
920D
Tanks
dp
,
greedy
,
implementation
2400
x683
1186F
Vus the Cossack and a Graph
dfs and similar
,
graphs
,
greedy
,
implementation
2400
x747
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x789
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x800
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x822
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x842
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x889
416D
Population Size
greedy
,
implementation
,
math
2400
x902
1091E
New Year and the Acquaintance Estimation
binary search
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
sortings
2400
x974
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x995
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1003
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1018
641D
Little Artem and Random Variable
dp
,
implementation
,
math
,
probabilities
2400
x1046
526E
Transmitting Levels
dp
,
implementation
2400
x1052
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1058
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1064
1205C
Palindromic Paths
implementation
,
interactive
2400
x1115
679C
Bear and Square Grid
dfs and similar
,
dsu
,
implementation
2400
x1131
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1135
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1179
1343F
Restore the Permutation by Sorted Segments
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1230
1374F
Cyclic Shifts Sorting
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1255
908F
New Year and Rainbow Roads
graphs
,
greedy
,
implementation
2400
x1369
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1386
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1398
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1426
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1434
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1437
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1493
1329C
Drazil Likes Heap
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1502
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1704
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1785
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1787
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1823
1369E
DeadLee
data structures
,
dfs and similar
,
greedy
,
implementation
,
sortings
2400
x2013
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2057
1358E
Are You Fired?
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x2077
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x2153
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x118
40C
Berland Square
implementation
,
math
2300
x239
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x247
241F
Race
brute force
,
implementation
2300
x259
77D
Domino Carpet
dp
,
implementation
2300
x309
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x321
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x347
43E
Race
brute force
,
implementation
,
two pointers
2300
x370
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x386
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x474
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x497
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x510
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x581
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x609
883C
Downloading B++
binary search
,
implementation
2300
x614
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x673
1250E
The Coronation
graphs
,
implementation
2300
x796
1070G
Monsters and Potions
brute force
,
dp
,
greedy
,
implementation
2300
x814
628E
Zbazi in Zeydabad
data structures
,
implementation
2300
x830
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x845
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x855
1468M
Similar Sets
data structures
,
graphs
,
implementation
2300
x904
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x909
878B
Teams Formation
data structures
,
implementation
2300
x1027
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1088
558D
Guess Your Way Out! II
data structures
,
implementation
,
sortings
2300
x1105
936C
Lock Puzzle
constructive algorithms
,
implementation
,
strings
2300
x1149
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1152
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1182
793C
Mice problem
geometry
,
implementation
,
math
,
sortings
2300
x1230
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1261
762D
Maximum path
dp
,
greedy
,
implementation
2300
x1285
1239C
Queue in the Train
data structures
,
greedy
,
implementation
2300
x1304
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1307
1385G
Columns Swaps
2-sat
,
dfs and similar
,
dsu
,
graphs
,
implementation
2300
x1314
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1347
1244F
Chips
constructive algorithms
,
implementation
2300
x1362
1004D
Sonya and Matrix
brute force
,
constructive algorithms
,
implementation
2300
x1389
723F
st-Spanning Tree
dsu
,
graphs
,
greedy
,
implementation
2300
x1438
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1445
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1606
1610E
AmShZ and G.O.A.T.
binary search
,
brute force
,
greedy
,
implementation
,
math
2300
x1624
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x1639
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1644
1236D
Alice and the Doll
brute force
,
data structures
,
greedy
,
implementation
2300
x1644
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1710
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1779
1607F
Robot on the Board 2
brute force
,
dfs and similar
,
graphs
,
implementation
2300
x1883
85D
Sum of Medians
binary search
,
brute force
,
data structures
,
implementation
2300
x1905
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x1910
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1964
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2043
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