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Before contest
Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
3 days
Register now »
*has extra registration
Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
3 days
Register now »
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→ Filter Problems
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two pointers
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
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probabilities
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ternary search
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Name
788A
Functions again
dp
,
two pointers
1600
x10202
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x133
777C
Alyona and Spreadsheet
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1600
x6817
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x295
771F
Bear and Isomorphic Points
geometry
,
two pointers
3300
x89
769B
News About Credit
*special problem
,
greedy
,
two pointers
1200
x3442
767D
Cartons of milk
binary search
,
data structures
,
greedy
,
sortings
,
two pointers
2100
x2414
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2989
762B
USB vs. PS/2
greedy
,
implementation
,
sortings
,
two pointers
1400
x10572
749C
Voting
greedy
,
implementation
,
two pointers
1500
x6253
748E
Santa Claus and Tangerines
binary search
,
data structures
,
greedy
,
two pointers
2100
x1598
746F
Music in Car
data structures
,
greedy
,
two pointers
2200
x903
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x149
734C
Anton and Making Potions
binary search
,
dp
,
greedy
,
two pointers
1600
x5683
733E
Sleep in Class
constructive algorithms
,
data structures
,
math
,
two pointers
2400
x1065
733C
Epidemic in Monstropolis
constructive algorithms
,
dp
,
greedy
,
two pointers
1800
x3543
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x607
716B
Complete the Word
greedy
,
two pointers
1300
x13001
702C
Cellular Network
binary search
,
implementation
,
two pointers
1500
x22813
701C
They Are Everywhere
binary search
,
strings
,
two pointers
1500
x19770
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x136
682E
Alyona and Triangles
geometry
,
two pointers
2600
x715
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x22418
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x749
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x10743
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3755
650B
Image Preview
binary search
,
brute force
,
dp
,
two pointers
1900
x3490
645C
Enduring Exodus
binary search
,
two pointers
1600
x4300
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2845
639D
Bear and Contribution
data structures
,
greedy
,
sortings
,
two pointers
2400
x1066
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x621
627E
Orchestra
two pointers
3000
x709
620D
Professor GukiZ and Two Arrays
binary search
,
two pointers
2200
x2000
618F
Double Knapsack
constructive algorithms
,
two pointers
3000
x1828
616D
Longest k-Good Segment
binary search
,
data structures
,
two pointers
1600
x12357
613B
Skills
binary search
,
brute force
,
dp
,
greedy
,
sortings
,
two pointers
1900
x2475
611G
New Year and Cake
geometry
,
two pointers
2900
x464
610D
Vika and Segments
constructive algorithms
,
data structures
,
geometry
,
two pointers
2300
x1734
609D
Gadgets for dollars and pounds
binary search
,
greedy
,
two pointers
2000
x3162
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x12067
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x39081
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x759
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x234
581F
Zublicanes and Mumocrates
dp
,
trees
,
two pointers
2400
x1034
580B
Kefa and Company
binary search
,
sortings
,
two pointers
1500
x31894
577B
Modulo Sum
combinatorics
,
data structures
,
dp
,
two pointers
1900
x14845
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2433
524D
Social Network
greedy
,
two pointers
2100
x1006
519D
A and B and Interesting Substrings
data structures
,
dp
,
two pointers
1800
x6898
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1526
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x5360
505C
Mr. Kitayuta, the Treasure Hunter
dfs and similar
,
dp
,
two pointers
1900
x7299
498B
Name That Tune
dp
,
probabilities
,
two pointers
2400
x1298
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x7503
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x56704
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x4208
484B
Maximum Value
binary search
,
math
,
sortings
,
two pointers
2100
x7727
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x41862
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x13528
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x862
439D
Devu and his Brother
binary search
,
sortings
,
ternary search
,
two pointers
1700
x6846
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x11932
430B
Balls Game
brute force
,
two pointers
1400
x4119
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x16878
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1394
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x10057
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x748
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x272
391A
Genetic Engineering
implementation
,
two pointers
x1810
387B
George and Round
brute force
,
greedy
,
two pointers
1200
x12970
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x949
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3803
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x783
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x89657
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x1129
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x15577
371E
Subway Innovation
greedy
,
math
,
two pointers
2000
x1438
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1722
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x627
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x5718
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x3211
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x8296
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x577
309B
Context Advertising
dp
,
two pointers
2100
x818
309A
Morning run
binary search
,
math
,
two pointers
2000
x530
302B
Eugeny and Play List
binary search
,
implementation
,
two pointers
1200
x9386
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x261
281B
Nearest Fraction
brute force
,
implementation
,
two pointers
1700
x3412
280B
Maximum Xor Secondary
data structures
,
implementation
,
two pointers
1800
x5248
279C
Ladder
dp
,
implementation
,
two pointers
1700
x8922
279B
Books
binary search
,
brute force
,
implementation
,
two pointers
1400
x72336
264D
Colorful Stones
dp
,
two pointers
2500
x451
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x11803
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x438
253D
Table with Letters - 2
brute force
,
two pointers
2000
x924
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x12363
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x21324
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x1009
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x232
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x6641
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