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Before contest
Codeforces Round #717 (Div. 2)
16:35:01
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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
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
x8824
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x6994
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x252
1508C
Complete the MST
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
x580
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x411
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x326
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x9295
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x874
1494B
Berland Crossword
bitmasks
,
brute force
,
greedy
,
implementation
1400
x9298
1494A
ABC String
bitmasks
,
brute force
,
implementation
900
x14465
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x224
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x502
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x4293
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x4500
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x388
1479C
Continuous City
bitmasks
,
constructive algorithms
2500
x882
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x1592
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x4464
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1359
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2323
1466E
Apollo versus Pan
bitmasks
,
brute force
,
math
1800
x5035
1463F
Max Correct Set
bitmasks
,
dp
,
math
3100
x189
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x10862
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x1920
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x2905
1450G
Communism
bitmasks
,
dp
,
trees
3500
x77
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x2160
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x60
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x819
1438D
Powerful Ksenia
bitmasks
,
constructive algorithms
,
math
2200
x2787
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x334
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x812
1423J
Bubble Cup hypothesis
bitmasks
,
constructive algorithms
,
dp
,
math
2400
x498
1423I
Lookup Tables
bitmasks
3000
x52
1421A
XORwice
bitmasks
,
greedy
,
math
800
x16234
1420B
Rock and Lever
bitmasks
,
math
1200
x13690
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x2521
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x3373
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x353
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1171
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1013
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x543
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x443
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x9182
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x251
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x2582
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x3602
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x173
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x11668
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x275
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x3603
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x7887
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x509
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x710
1362C
Johnny and Another Rating Drop
bitmasks
,
greedy
,
math
1400
x12516
1362B
Johnny and His Hobbies
bitmasks
,
brute force
1200
x14052
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x943
1360H
Binary Median
binary search
,
bitmasks
,
brute force
,
constructive algorithms
2100
x3406
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x8424
1342F
Make It Ascending
bitmasks
,
brute force
,
dp
3000
x268
1340B
Nastya and Scoreboard
bitmasks
,
dp
,
graphs
,
greedy
1700
x6291
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x2366
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x6209
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x140
1336E1
Chiori and Doll Picking (easy version)
bitmasks
,
brute force
,
combinatorics
,
math
2700
x432
1334G
Substring Search
bitmasks
,
brute force
,
fft
2900
x249
1332D
Walk on Matrix
bitmasks
,
constructive algorithms
,
math
1700
x6628
1331C
...And after happily lived ever they
bitmasks
x2907
1329B
Dreamoon Likes Sequences
bitmasks
,
combinatorics
,
math
1700
x5181
1327G
Letters and Question Marks
bitmasks
,
dp
,
string suffix structures
2800
x284
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x904
1326F2
Wise Men (Hard Version)
bitmasks
,
dp
,
math
3200
x203
1326F1
Wise Men (Easy Version)
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2600
x544
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x8147
1322D
Reality Show
bitmasks
,
dp
2800
x372
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x2643
1316E
Team Building
bitmasks
,
dp
,
greedy
,
sortings
2300
x1845
1313D
Happy New Year
bitmasks
,
dp
,
implementation
2500
x557
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x11377
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x290
1303D
Fill The Bag
bitmasks
,
greedy
1900
x4849
1302F
Keep talking and nobody explodes -- easy
bitmasks
,
brute force
,
expression parsing
x67
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x231
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x111
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x4333
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x5124
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x9848
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x164
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1361
1245F
Daniel and Spring Cleaning
bitmasks
,
brute force
,
combinatorics
,
dp
2300
x1221
1242C
Sum Balance
bitmasks
,
dfs and similar
,
dp
,
graphs
2400
x1094
1238E
Keyboard Purchase
bitmasks
,
dp
2200
x1820
1234F
Yet Another Substring Reverse
bitmasks
,
dp
2200
x1575
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x186
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x6533
1221G
Graph And Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
meet-in-the-middle
2900
x263
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x2960
1217C
The Number Of Good Substrings
binary search
,
bitmasks
,
brute force
1700
x5631
1215E
Marbles
bitmasks
,
dp
2200
x2013
1214G
Feeling Good
bitmasks
,
data structures
3200
x153
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