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Codeforces Round 976 (Div. 2) and Divide By Zero 9.0
14:14:55
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Difficulty:
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combine-tags-by-or
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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
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1332
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4420
1969C
Minimizing the Sum
dp
,
implementation
1700
x8453
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1909
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x4140
1968F
Equal XOR Segments
binary search
,
data structures
1800
x5330
1968E
Cells Arrangement
constructive algorithms
1600
x10152
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x64
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x101
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x211
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x635
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1698
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3856
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x12970
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x12196
1965F
Conference
data structures
,
flows
3300
x167
1965E
Connected Cubes
constructive algorithms
,
games
3100
x249
1965D
Missing Subarray Sum
constructive algorithms
2900
x405
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1875
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x6543
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x13371
1958J
Necromancer
*special problem
3200
x30
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x31
1958H
Composite Spells
*special problem
,
dp
2600
x74
1958G
Observation Towers
*special problem
2400
x103
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x188
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x244
1958D
Staircase
*special problem
1600
x497
1958C
Firewood
*special problem
1500
x678
1958B
Clock in the Pool
*special problem
,
math
1400
x867
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x428
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x474
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1232
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4391
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x9419
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x340
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x823
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1415
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3825
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x12651
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1224
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4399
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x6936
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x8430
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x15033
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x246
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x2185
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x5954
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x75
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x267
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x329
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x753
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3563
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x5328
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x11426
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x4249
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8971
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x14134
1949K
Make Triangle
constructive algorithms
,
math
2800
x314
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x374
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1754
1949H
Division Avoidance
greedy
,
math
3100
x118
1949G
Scooter
graphs
,
greedy
2300
x751
1949F
Dating
greedy
,
sortings
,
trees
2200
x940
1949E
Damage per Second
brute force
,
math
2900
x102
1949D
Funny or Scary?
constructive algorithms
2600
x392
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1666
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x3066
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x105
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x678
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1288
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2932
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x9239
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x942
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2502
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4630
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x10682
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x643
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x735
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x4134
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x7981
1943F
Minimum Hamming Distance
dp
3500
x105
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x293
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x429
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x742
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1446
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x2063
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3787
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x90
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x433
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x687
1942E
Farm Game
combinatorics
,
games
2300
x1650
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2740
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x6076
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3451
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5898
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x9522
1938M
Zig-zag
3500
x57
1938L
XOR Operations
2800
x291
1938K
Tree Quiz
2400
x619
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