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Before contest
Codeforces Round 950 (Div. 3)
04:24:25
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Difficulty:
—
bitmasks
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
1583F
Defender of Childhood Dreams
bitmasks
,
constructive algorithms
,
divide and conquer
2500
x1228
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5309
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x327
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x787
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11885
1567B
MEXor Mixup
bitmasks
,
greedy
1000
x21751
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x17098
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19171
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4225
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x5952
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x29014
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8363
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x310
1556F
Sports Betting
bitmasks
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
2500
x1182
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6589
1554C
Mikasa
binary search
,
bitmasks
,
greedy
,
implementation
1800
x8606
1554B
Cobb
bitmasks
,
brute force
,
greedy
,
math
1700
x12496
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x676
1553C
Penalty
bitmasks
,
brute force
,
dp
,
greedy
1200
x17397
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x456
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6737
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1452
1548D1
Gregor and the Odd Cows (Easy)
bitmasks
,
geometry
,
math
,
number theory
2300
x1432
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x16159
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x397
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7468
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5197
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x81
1530F
Bingo
bitmasks
,
combinatorics
,
dp
,
math
,
probabilities
2600
x754
1527A
And Then There Were K
bitmasks
800
x34188
1523F
Favorite Game
bitmasks
,
dp
3300
x405
1523D
Love-Hate
bitmasks
,
brute force
,
dp
,
probabilities
2400
x2088
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x391
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x11581
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x18273
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x218
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
1200
x23140
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x13913
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x705
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1431
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x769
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x857
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16243
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x1491
1494B
Berland Crossword
bitmasks
,
brute force
,
greedy
,
implementation
1400
x14015
1494A
ABC String
bitmasks
,
brute force
,
implementation
900
x20471
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x378
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x869
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x5953
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x6934
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x972
1479C
Continuous City
bitmasks
,
constructive algorithms
2500
x1261
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2256
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6180
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1860
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2802
1466E
Apollo versus Pan
bitmasks
,
brute force
,
math
1800
x7047
1463F
Max Correct Set
bitmasks
,
dp
,
math
3100
x556
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x18865
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2875
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4234
1450G
Communism
bitmasks
,
dp
,
trees
3500
x234
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3410
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x216
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1296
1438D
Powerful Ksenia
bitmasks
,
constructive algorithms
,
math
2200
x4082
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x633
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1271
1423J
Bubble Cup hypothesis
bitmasks
,
constructive algorithms
,
dp
,
math
2400
x739
1423I
Lookup Tables
bitmasks
3000
x103
1421A
XORwice
bitmasks
,
greedy
,
math
800
x27486
1420B
Rock and Lever
bitmasks
,
math
1200
x24010
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4202
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5210
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x581
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1560
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1538
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x907
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x779
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x13579
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x445
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3242
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4951
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x432
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x18468
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x564
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x4781
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11276
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x923
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x1119
1362C
Johnny and Another Rating Drop
bitmasks
,
greedy
,
math
1400
x17198
1362B
Johnny and His Hobbies
bitmasks
,
brute force
1200
x18447
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1391
1360H
Binary Median
binary search
,
bitmasks
,
brute force
,
constructive algorithms
2100
x4297
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11907
1342F
Make It Ascending
bitmasks
,
brute force
,
dp
3000
x693
1340B
Nastya and Scoreboard
bitmasks
,
dp
,
graphs
,
greedy
1700
x7630
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x3013
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8140
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x291
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