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Educational Codeforces Round 166 (Rated for Div. 2)
04:38:48
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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
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
x297
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
x962
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
x4149
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
x12902
1977A
Little Nikita
math
x21391
1975I
Mind Bloom
dp
x13
1975H
378QAQ and Core
greedy
,
strings
x31
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
x120
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
x479
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
x1453
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
x4039
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
x10190
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
x12696
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
x14669
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x2985
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x2512
1974E
Money Buys Happiness
dp
1800
x5482
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x11052
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x11838
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x25142
1974A
Phone Desktop
greedy
,
math
800
x27218
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x127
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x581
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1498
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x6431
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x11129
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x19720
1972B
Coin Games
games
900
x17545
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x19416
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1228
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x7049
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x7489
1971E
Find the Car
binary search
,
math
,
sortings
1500
x10617
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x20727
1971C
Clock and Strings
implementation
900
x25879
1971B
Different String
implementation
,
strings
800
x29401
1971A
My First Sorting Problem
implementation
,
sortings
800
x35408
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x205
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x374
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x835
1970F3
Playing Quidditch (Hard)
implementation
2300
x279
1970F2
Playing Quidditch (Medium)
implementation
2300
x270
1970F1
Playing Quidditch (Easy)
implementation
2300
x340
1970E3
Trails (Hard)
dp
,
matrices
2200
x432
1970E2
Trails (Medium)
dp
,
matrices
2000
x762
1970E1
Trails (Easy)
dp
1800
x1169
1970D3
Arithmancy (Hard)
interactive
3100
x71
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x136
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x433
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x887
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1473
1970C1
Game on Tree (Easy)
games
1400
x1882
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x337
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x523
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x735
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x353
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x356
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2722
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x137
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1019
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3611
1969C
Minimizing the Sum
dp
,
implementation
1700
x6633
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x15413
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x17013
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1487
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3361
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4278
1968E
Cells Arrangement
constructive algorithms
1600
x8428
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x12371
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x20696
1968B
Prefiquence
greedy
,
two pointers
800
x24276
1968A
Maximize?
brute force
,
math
,
number theory
800
x28680
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x38
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x67
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x137
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x485
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1387
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3283
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x10690
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x9998
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x12489
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x15453
1965F
Conference
data structures
,
flows
3300
x94
1965E
Connected Cubes
constructive algorithms
,
games
3100
x192
1965D
Missing Subarray Sum
constructive algorithms
2900
x293
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1524
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5411
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x11026
1958J
Necromancer
*special problem
3200
x15
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x22
1958H
Composite Spells
*special problem
,
dp
2600
x64
1958G
Observation Towers
*special problem
2400
x91
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x153
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x205
1958D
Staircase
*special problem
1600
x359
1958C
Firewood
*special problem
1500
x487
1958B
Clock in the Pool
*special problem
,
math
1400
x667
1958A
1-3-5
*special problem
,
dp
1100
x1114
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x302
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x362
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