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Educational Codeforces Round 167 (Rated for Div. 2)
20:33:57
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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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Custom test
Problems
#
Name
1498C
Planar Reflections
brute force
,
data structures
,
dp
1600
x9378
1497C2
k-LCM (hard version)
constructive algorithms
,
math
1600
x16708
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x11799
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x9142
1481C
Fence Painting
brute force
,
constructive algorithms
,
greedy
1600
x11391
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x11126
1475E
Advertising Agency
combinatorics
,
math
,
sortings
1600
x13145
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10550
1468K
The Robot
brute force
,
implementation
1600
x4990
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9040
1458A
Row GCD
math
,
number theory
1600
x16661
1455D
Sequence and Swaps
dp
,
greedy
,
sortings
1600
x12065
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x7802
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12416
1431C
Black Friday
*special problem
,
implementation
1600
x699
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4716
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11581
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x24784
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x15087
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x13634
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x16061
1374E1
Reading Books (easy version)
data structures
,
greedy
,
sortings
1600
x13665
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15210
1371D
Grid-00100
constructive algorithms
,
greedy
,
implementation
1600
x12871
1364C
Ehab and Prefix MEXs
brute force
,
constructive algorithms
,
greedy
1600
x12814
1363C
Game On Leaves
games
,
trees
1600
x18071
1358C
Celex Update
math
1600
x17134
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x17578
1352G
Special Permutation
constructive algorithms
1600
x20296
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x16317
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14310
1346D
Constructing the Dungeon
*special problem
,
graphs
,
greedy
1600
x483
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x585
1344A
Hilbert's Hotel
math
,
number theory
,
sortings
1600
x15348
1342C
Yet Another Counting Problem
math
,
number theory
1600
x13732
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x19773
1334C
Circle of Monsters
brute force
,
constructive algorithms
,
greedy
,
math
1600
x16364
1327C
Game with Chips
constructive algorithms
,
implementation
1600
x13287
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9671
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x14068
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x12049
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12755
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x11543
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8472
1288C
Two Arrays
combinatorics
,
dp
1600
x12554
1284C
New Year and Permutation
combinatorics
,
math
1600
x7912
1282B2
K for the Price of One (Hard Version)
dp
,
greedy
,
sortings
1600
x10056
1281B
Azamon Web Services
greedy
1600
x8213
1255C
League of Leesins
constructive algorithms
,
implementation
1600
x6653
1252C
Even Path
data structures
,
implementation
1600
x3639
1251C
Minimize The Integer
greedy
,
two pointers
1600
x12040
1243B2
Character Swap (Hard Version)
strings
1600
x7004
1238C
Standard Free2play
dp
,
greedy
,
math
1600
x7255
1234D
Distinct Characters Queries
data structures
1600
x14503
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6161
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x8843
1223C
Save the Nature
binary search
,
greedy
1600
x8009
1217B
Zmei Gorynich
greedy
,
math
1600
x11084
1213D2
Equalizing by Division (hard version)
brute force
,
math
,
sortings
1600
x11277
1203D1
Remove the Substring (easy version)
greedy
,
implementation
1600
x8626
1198B
Welfare State
binary search
,
brute force
,
data structures
,
sortings
1600
x9362
1198A
MP3
sortings
,
two pointers
1600
x8946
1196D2
RGB Substring (hard version)
data structures
,
dp
,
implementation
,
two pointers
1600
x9539
1188A1
Add on a Tree
trees
1600
x8327
1184D1
Parallel Universes (Easy)
implementation
1600
x2486
1184C1
Heidi and the Turing Test (Easy)
implementation
1600
x2279
1175C
Electrification
binary search
,
brute force
,
greedy
1600
x6711
1175B
Catch Overflow!
data structures
,
expression parsing
,
implementation
1600
x10392
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x8101
1165D
Almost All Divisors
math
,
number theory
1600
x15508
1163B2
Cat Party (Hard Edition)
data structures
,
implementation
1600
x7122
1151D
Stas and the Queue at the Buffet
greedy
,
math
,
sortings
1600
x8313
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x10846
1148B
Born This Way
binary search
,
brute force
,
two pointers
1600
x7311
1140C
Playlist
brute force
,
data structures
,
sortings
1600
x9343
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5947
1137A
Skyscrapers
implementation
,
sortings
1600
x4439
1133F1
Spanning Tree with Maximum Degree
graphs
1600
x7600
1121C
System Testing
implementation
1600
x1946
1115U2
Chessboard unitary
*special problem
1600
x231
1115G3
Palindrome checker oracle
*special problem
1600
x228
1115G2
OR oracle
*special problem
1600
x309
1109A
Sasha and a Bit of Relax
dp
,
implementation
1600
x8408
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8472
1096C
Polygon for the Angle
brute force
,
geometry
1600
x6702
1095D
Circular Dance
implementation
1600
x7451
1085C
Connect Three
implementation
,
math
1600
x5381
1082C
Multi-Subject Competition
greedy
,
sortings
1600
x5534
1082B
Vova and Trophies
greedy
1600
x7439
1077D
Cutting Out
binary search
,
sortings
1600
x8491
1065C
Make It Equal
greedy
1600
x7691
1062C
Banh-mi
greedy
,
implementation
,
math
1600
x5342
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4835
1059C
Sequence Transformation
constructive algorithms
,
math
1600
x7007
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5740
1056B
Divide Candies
math
,
number theory
1600
x4159
1045I
Palindrome Pairs
hashing
,
strings
1600
x4235
1041C
Coffee Break
binary search
,
data structures
,
greedy
,
two pointers
1600
x9329
1036D
Vasya and Arrays
greedy
,
two pointers
1600
x9043
1036B
Diagonal Walking v.2
math
1600
x5639
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