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Educational Codeforces Round 169 (Rated for Div. 2)
12:12:35
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Difficulty:
—
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
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x14415
1512G
Short Task
brute force
,
dp
,
math
,
number theory
1700
x8049
1512E
Permutation by Sum
brute force
,
greedy
,
math
1600
x10324
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11344
1506E
Restoring the Permutation
constructive algorithms
,
implementation
1500
x12964
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x21455
1505C
Fibonacci Words
*special problem
,
implementation
1400
x6393
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x6121
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x6992
1503A
Balance the Bits
constructive algorithms
,
greedy
1600
x13306
1499C
Minimum Grid Path
brute force
,
data structures
,
greedy
,
math
1500
x12550
1498C
Planar Reflections
brute force
,
data structures
,
dp
1600
x9562
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16773
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8234
1497C2
k-LCM (hard version)
constructive algorithms
,
math
1600
x16978
1494B
Berland Crossword
bitmasks
,
brute force
,
greedy
,
implementation
1400
x14232
1493B
Planet Lapituletti
brute force
,
implementation
1300
x11796
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15931
1491C
Pekora and Trampoline
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x7858
1490F
Equalize the Array
binary search
,
data structures
,
greedy
,
math
,
sortings
1500
x15900
1490E
Accidental Victory
binary search
,
data structures
,
greedy
1400
x18835
1487D
Pythagorean Triples
binary search
,
brute force
,
math
,
number theory
1500
x17579
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x14015
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x11924
1486B
Eastern Exhibition
binary search
,
geometry
,
shortest paths
,
sortings
1500
x15724
1485C
Floor and Mod
binary search
,
brute force
,
math
,
number theory
1700
x9827
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x9327
1482B
Restore Modulo
implementation
,
math
1500
x9137
1481C
Fence Painting
brute force
,
constructive algorithms
,
greedy
1600
x11543
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x11412
1478C
Nezzar and Symmetric Array
implementation
,
math
,
sortings
1700
x9681
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8539
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x11264
1476B
Inflation
binary search
,
brute force
,
greedy
,
math
1300
x19847
1475E
Advertising Agency
combinatorics
,
math
,
sortings
1600
x13445
1475C
Ball in Berland
combinatorics
,
graphs
,
math
1400
x20806
1474C
Array Destruction
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1700
x12524
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9536
1473C
No More Inversions
constructive algorithms
,
math
1500
x12605
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7946
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x22049
1469D
Ceil Divisions
brute force
,
constructive algorithms
,
math
,
number theory
1700
x9353
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10672
1468K
The Robot
brute force
,
implementation
1600
x5066
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3691
1468D
Firecrackers
binary search
,
sortings
1700
x4608
1468C
Berpizza
data structures
,
implementation
1400
x7685
1467B
Hills And Valleys
brute force
,
implementation
1700
x10884
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x11145
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x17530
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x19189
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9571
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13584
1462D
Add to Neighbour and Remove
greedy
,
math
,
number theory
1400
x16601
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9173
1461C
Random Events
dp
,
math
,
probabilities
1500
x11115
1461B
Find the Spruce
brute force
,
dp
,
implementation
1400
x12553
1459B
Move and Turn
dp
,
math
1300
x14498
1458A
Row GCD
math
,
number theory
1600
x17209
1455D
Sequence and Swaps
dp
,
greedy
,
sortings
1600
x12199
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x20165
1453C
Triangles
greedy
,
implementation
1700
x6015
1453B
Suffix Operations
constructive algorithms
,
implementation
1400
x13292
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x7916
1452B
Toy Blocks
binary search
,
greedy
,
math
,
sortings
1400
x14623
1451D
Circle Game
games
,
geometry
,
math
1700
x9456
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15417
1446A
Knapsack
constructive algorithms
,
greedy
,
sortings
1300
x15348
1444A
Division
brute force
,
math
,
number theory
1500
x12894
1443C
The Delivery Dilemma
binary search
,
greedy
,
sortings
1400
x15141
1443B
Saving the City
dp
,
greedy
,
math
,
sortings
1300
x15690
1439A1
Binary Table (Easy Version)
constructive algorithms
,
implementation
1500
x9319
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12608
1436C
Binary Search
binary search
,
combinatorics
1500
x10740
1433E
Two Round Dances
combinatorics
,
math
1300
x18328
1431D
Used Markers
*special problem
,
greedy
1500
x454
1431C
Black Friday
*special problem
,
implementation
1600
x702
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x1007
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8757
1427B
Chess Cheater
greedy
,
implementation
,
sortings
1400
x10843
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x15839
1425H
Huge Boxes of Animal Toys
constructive algorithms
1300
x4129
1425F
Flamingoes of Mystery
interactive
1400
x5474
1425A
Arena of Greed
games
,
greedy
1400
x6460
1424G
Years
data structures
,
sortings
1300
x5750
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4797
1422C
Bargain
combinatorics
,
dp
,
math
1700
x8179
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14317
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12710
1420C1
Pokémon Army (easy version)
constructive algorithms
,
dp
,
greedy
1300
x17408
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x15212
1419C
Killjoy
greedy
,
implementation
,
math
1500
x15247
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x19338
1418B
Negative Prefixes
greedy
,
sortings
1300
x16549
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x12274
1415C
Bouncing Ball
brute force
,
dp
,
implementation
1400
x10817
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6457
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7935
1409D
Decrease the Sum of Digits
greedy
,
math
1500
x19199
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8783
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