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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
42:34:10
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binary search
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
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1534
1725B
Basketball Together
binary search
,
greedy
,
sortings
1000
x11587
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x12950
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12847
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x7084
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x303
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2037
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4252
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x464
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2349
1709D
Rorororobot
binary search
,
data structures
,
greedy
,
math
1700
x8053
1707E
Replace
binary search
,
data structures
3500
x557
1707A
Doremy's IQ
binary search
,
constructive algorithms
,
greedy
,
implementation
1600
x12803
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2352
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x6649
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1977
1703F
Yet Another Problem About Pairs Satisfying an Inequality
binary search
,
data structures
,
dp
,
greedy
,
sortings
1300
x18064
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5470
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x15674
1700D
River Locks
binary search
,
dp
,
greedy
,
math
1900
x5821
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x8653
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x4251
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x13917
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5163
1693F
I Might Be Wrong
binary search
,
greedy
,
two pointers
3400
x274
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x19828
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5457
1690G
Count the Trains
binary search
,
data structures
,
greedy
,
sortings
2000
x3219
1690E
Price Maximization
binary search
,
greedy
,
math
,
two pointers
1500
x14451
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x556
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1335
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3030
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x9475
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4555
1676E
Eating Queries
binary search
,
greedy
,
sortings
1100
x24526
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x6146
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x2090
1671C
Dolce Vita
binary search
,
brute force
,
greedy
,
math
1200
x15854
1670D
Very Suspicious
binary search
,
brute force
,
geometry
,
greedy
,
implementation
,
math
1700
x4943
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x22914
1666E
Even Split
binary search
,
constructive algorithms
,
greedy
,
math
2500
x677
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x8028
1661F
Teleporters
binary search
,
greedy
2600
x549
1661C
Water the Trees
binary search
,
greedy
,
math
1700
x8945
1659C
Line Empire
binary search
,
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9616
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x4695
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x985
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x362
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4804
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4004
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2318
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3178
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1455
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x926
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1108
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4455
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12224
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5492
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x84
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x822
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15175
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3783
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10593
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x576
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3167
1624D
Palindromes Coloring
binary search
,
greedy
,
sortings
,
strings
1400
x16205
1623C
Balanced Stone Heaps
binary search
,
greedy
1600
x11278
1622C
Set or Decrease
binary search
,
brute force
,
greedy
,
sortings
1600
x12325
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1710
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2259
1619D
New Year's Problem
binary search
,
greedy
,
sortings
1800
x7227
1617C
Paprika and Permutation
binary search
,
greedy
,
math
,
sortings
1300
x14433
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x307
1614E
Divan and a Cottage
binary search
,
data structures
2600
x809
1613C
Poisoned Dagger
binary search
1200
x22459
1612C
Chat Ban
binary search
,
math
1300
x15732
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6162
1611B
Team Composition: Programmers and Mathematicians
binary search
,
constructive algorithms
,
math
800
x28375
1610E
AmShZ and G.O.A.T.
binary search
,
brute force
,
greedy
,
implementation
,
math
2300
x1624
1610C
Keshi Is Throwing a Party
binary search
,
greedy
1600
x10654
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9470
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x147
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x423
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x995
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x167
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1322
1593C
Save More Mice
binary search
,
greedy
,
greedy
1000
x23871
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2156
1592A
Gamer Hemose
binary search
,
greedy
,
math
,
sortings
800
x21556
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x266
1584E
Game with Stones
binary search
,
data structures
,
games
,
greedy
2300
x1217
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3516
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1709
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3577
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1049
1575J
Jeopardy of Dropped Balls
binary search
,
brute force
,
dsu
,
implementation
1500
x3639
1575B
Building an Amusement Park
binary search
,
geometry
2300
x450
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4347
1574C
Slay the Dragon
binary search
,
greedy
,
sortings
,
ternary search
1300
x16488
1572E
Polygon
binary search
,
dp
,
geometry
3000
x277
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