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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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Custom test
Problems
#
Name
265A
Colorful Stones (Simplified Edition)
implementation
800
x36466
264E
Roadside Trees
data structures
,
dp
3000
x428
264D
Colorful Stones
dp
,
two pointers
2500
x419
264C
Choosing Balls
dp
2000
x2900
264B
Good Sequences
dp
,
number theory
1500
x10129
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10742
263E
Rhombus
brute force
,
data structures
,
dp
2500
x400
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3586
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1075
263B
Squares
greedy
,
implementation
,
sortings
900
x8877
263A
Beautiful Matrix
implementation
800
x241154
262B
Roma and Changing Signs
greedy
1200
x11311
262A
Roma and Lucky Numbers
implementation
800
x19833
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x413
261D
Maxim and Increasing Subsequence
dp
2600
x561
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x771
261B
Maxim and Restaurant
dp
,
math
,
probabilities
1900
x1403
261A
Maxim and Discounts
greedy
,
sortings
1400
x5156
260E
Dividing Kingdom
binary search
,
brute force
,
data structures
2500
x455
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1535
260C
Balls and Boxes
constructive algorithms
,
greedy
,
implementation
1700
x2964
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3799
260A
Adding Digits
implementation
,
math
1400
x14582
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x13918
259A
Little Elephant and Chess
brute force
,
strings
1000
x9110
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1092
258D
Little Elephant and Broken Sorting
dp
,
math
,
probabilities
2600
x1252
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1784
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1446
258A
Little Elephant and Bits
greedy
,
math
1100
x22839
257E
Greedy Elevator
data structures
,
implementation
2200
x285
257D
Sum
greedy
,
math
1900
x1569
257C
View Angle
brute force
,
geometry
,
math
1800
x4294
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x7037
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6468
256E
Lucky Arrays
data structures
2400
x666
256D
Liars and Serge
dp
2700
x256
255E
Furlo and Rublo and Game
games
,
implementation
,
math
2200
x850
255D
Mr. Bender and Square
binary search
,
implementation
,
math
1800
x1973
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4698
255B
Code Parsing
implementation
1200
x4950
255A
Greg's Workout
implementation
800
x28434
254E
Dormitory
dp
,
implementation
2100
x669
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x535
254C
Anagram
greedy
,
strings
1800
x1491
254B
Jury Size
brute force
,
implementation
1500
x2145
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x7026
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x526
253D
Table with Letters - 2
brute force
,
two pointers
2000
x830
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2593
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x10652
253A
Boys and Girls
greedy
1100
x11209
252B
Unsorting Array
brute force
,
sortings
1800
x1710
252A
Little Xor
brute force
,
implementation
1100
x5266
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x170
251D
Two Sets
bitmasks
,
math
2700
x475
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1025
251B
Playing with Permutations
implementation
,
math
1800
x1267
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x17444
250E
Mad Joe
brute force
2000
x465
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x889
250C
Movie Critics
greedy
1600
x1925
250B
Restoring IPv6
implementation
,
strings
1500
x1976
250A
Paper Work
greedy
1000
x4078
249E
Endless Matrix
math
2600
x306
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x453
248E
Piglet's Birthday
dp
,
math
,
probabilities
2600
x579
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x494
248C
Robo-Footballer
binary search
,
geometry
2000
x844
248B
Chilly Willy
math
,
number theory
1400
x5298
248A
Cupboards
implementation
800
x22169
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x3194
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9400
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2621
246B
Increase and Decrease
greedy
,
math
1300
x11250
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9229
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x6560
245G
Suggested Friends
brute force
,
graphs
2200
x431
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x875
245E
Mishap in Club
greedy
,
implementation
1400
x3271
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2292
245C
Game with Coins
greedy
1700
x1542
245B
Internet Address
implementation
,
strings
1100
x5210
245A
System Administrator
implementation
800
x8389
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4464
244A
Dividing Orange
implementation
900
x7887
243E
Matrix
data structures
3000
x190
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x214
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x529
243B
Hydra
graphs
,
sortings
2000
x1222
243A
The Brand New Function
bitmasks
1600
x3905
242E
XOR on Segment
bitmasks
,
data structures
2000
x9051
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1865
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8531
242B
Big Segment
implementation
,
sortings
1100
x15655
242A
Heads or Tails
brute force
,
implementation
1100
x6366
241G
Challenging Balloons
constructive algorithms
1900
x545
241F
Race
brute force
,
implementation
2300
x263
241E
Flights
graphs
,
shortest paths
2600
x1063
241D
Numbers
2900
x367
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