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Before contest
Codeforces Round 974 (Div. 3)
14:09:20
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Difficulty:
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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
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x25237
1360D
Buying Shovels
math
,
number theory
1300
x32952
1360C
Similar Pairs
constructive algorithms
,
graph matchings
,
greedy
,
sortings
1100
x32769
1360B
Honest Coach
greedy
,
sortings
800
x47761
1360A
Minimal Square
greedy
,
math
800
x50365
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x538
1359E
Modular Stability
combinatorics
,
math
,
number theory
2000
x6100
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x9428
1359C
Mixing Water
binary search
,
math
1700
x13798
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27751
1359A
Berland Poker
brute force
,
greedy
,
math
1000
x29570
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x448
1358E
Are You Fired?
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x2312
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8147
1358C
Celex Update
math
1600
x17347
1358B
Maria Breaks the Self-isolation
greedy
,
sortings
1000
x24899
1358A
Park Lighting
greedy
,
math
800
x39315
1357E2
Root of quantum Fourier transform
x51
1357E1
Power of quantum Fourier transform
x193
1357D5
Quantum Classification - Dataset 7
x82
1357D4
Quantum Classification - Dataset 6
x85
1357D3
Quantum Classification - Dataset 5
x105
1357D2
Quantum Classification - Dataset 4
x112
1357D1
Quantum Classification - Dataset 3
x125
1357C2
Prepare superposition of basis states with the same parity
x303
1357C1
Prepare superposition of basis states with 0s
x348
1357B2
"Is the number divisible by 3?" oracle
x214
1357B1
"Is the bit string balanced?" oracle
x214
1357A7
Distinguish Y, XZ, -Y and -XZ
x182
1357A6
Distinguish four Pauli gates
x167
1357A5
Distinguish Rz(θ) from Ry(θ)
x240
1357A4
Distinguish Rz from R1
x351
1357A3
Distinguish H from X
x478
1357A2
Distinguish I, CNOTs and SWAP
x510
1357A1
Figure out direction of CNOT
x632
1356D2
Quantum Classification - 2
*special problem
x127
1356D1
Quantum Classification - 1
*special problem
x136
1356C
Prepare state |01⟩ + |10⟩ + |11⟩
*special problem
x302
1356B2
Decrement
*special problem
x282
1356B1
Increment
*special problem
x282
1356A5
Distinguish Z from -Z
*special problem
x330
1356A4
Distinguish I ⊗ X from CNOT
*special problem
x459
1356A3
Distinguish Z from S
*special problem
x461
1356A2
Distinguish I from Z
*special problem
x488
1356A1
Distinguish I from X
*special problem
x603
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x858
1355E
Restorer Distance
binary search
,
greedy
,
math
,
sortings
,
ternary search
2100
x5110
1355D
Game With Array
constructive algorithms
,
math
1400
x17984
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10631
1355B
Young Explorers
dp
,
greedy
,
sortings
1200
x25599
1355A
Sequence with Digits
brute force
,
implementation
,
math
1200
x26510
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x783
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x1197
1354E
Graph Coloring
dfs and similar
,
dp
,
graphs
2100
x3324
1354D
Multiset
binary search
,
data structures
1900
x8745
1354C2
Not So Simple Polygon Embedding
binary search
,
brute force
,
geometry
,
math
2000
x6069
1354C1
Simple Polygon Embedding
binary search
,
geometry
,
math
,
ternary search
1400
x15671
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x30766
1354A
Alarm Clock
math
900
x23751
1353F
Decreasing Heights
brute force
,
dp
2200
x3322
1353E
K-periodic Garland
brute force
,
dp
,
greedy
1900
x7131
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x18058
1353C
Board Moves
math
1000
x35327
1353B
Two Arrays And Swaps
greedy
,
sortings
800
x49403
1353A
Most Unstable Array
constructive algorithms
,
greedy
,
math
800
x40561
1352G
Special Permutation
constructive algorithms
1600
x21115
1352F
Binary String Reconstruction
constructive algorithms
,
dfs and similar
,
math
1500
x17067
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x20456
1352D
Alice, Bob and Candies
implementation
1300
x26073
1352C
K-th Not Divisible by n
binary search
,
math
1200
x54052
1352B
Same Parity Summands
constructive algorithms
,
math
1200
x37441
1352A
Sum of Round Numbers
implementation
,
math
800
x78811
1351C
Skier
data structures
,
implementation
1400
x8538
1351B
Square?
brute force
,
implementation
,
math
900
x16950
1351A
A+B (Trial Problem)
implementation
800
x23725
1350B
Orac and Models
dp
,
math
,
number theory
1400
x22060
1350A
Orac and Factors
math
900
x26057
1349F2
Slime and Sequences (Hard Version)
dp
,
fft
,
math
3500
x112
1349F1
Slime and Sequences (Easy Version)
dp
,
fft
,
math
3100
x412
1349E
Slime and Hats
constructive algorithms
,
dp
,
greedy
3500
x92
1349D
Slime and Biscuits
math
,
probabilities
3200
x902
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4519
1349B
Orac and Medians
constructive algorithms
,
greedy
,
math
2000
x8136
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x16987
1348F
Phoenix and Memory
data structures
,
dfs and similar
,
graphs
,
greedy
2600
x810
1348E
Phoenix and Berries
brute force
,
dp
,
greedy
,
math
2400
x2215
1348D
Phoenix and Science
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x8842
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14604
1348B
Phoenix and Beauty
constructive algorithms
,
data structures
,
greedy
,
sortings
1400
x25289
1348A
Phoenix and Balance
greedy
,
math
800
x39406
1346I
Pac-Man 2.0
*special problem
,
dp
2900
x49
1346H
Game with Segments
*special problem
,
data structures
,
games
2700
x50
1346G
Two IP Cameras
*special problem
,
math
,
number theory
2300
x135
1346F
Dune II: Battle For Arrakis
*special problem
,
data structures
,
greedy
,
math
2000
x228
1346E
Magic Tricks
*special problem
,
dp
,
graphs
1700
x378
1346D
Constructing the Dungeon
*special problem
,
graphs
,
greedy
1600
x502
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x605
1346B
Boot Camp
*special problem
,
greedy
1400
x1205
1346A
Color Revolution
*special problem
,
math
1000
x2029
1345B
Card Constructions
binary search
,
brute force
,
dp
,
math
1100
x26370
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