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Difficulty:
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dp
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
289B
Polo the Penguin and Matrix
brute force
,
dp
,
implementation
,
sortings
,
ternary search
1400
x16746
288E
Polo the Penguin and Lucky Numbers
dp
,
implementation
,
math
2800
x283
285E
Positions in Permutations
combinatorics
,
dp
,
math
2600
x930
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1507
283D
Cows and Cool Sequences
dp
,
math
,
number theory
2400
x521
283C
Coin Troubles
dp
2100
x1230
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3607
282D
Yet Another Number Game
dp
,
games
2100
x1377
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x196
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1410
279D
The Minimum Number of Variables
bitmasks
,
dp
2200
x691
279C
Ladder
dp
,
implementation
,
two pointers
1700
x8047
277D
Google Code Jam
dp
,
probabilities
2800
x324
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x12969
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4887
273E
Dima and Game
dp
,
games
2600
x359
273D
Dima and Figure
dp
2400
x385
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x413
269B
Greenhouse Effect
dp
1700
x6114
268D
Wall Bars
dp
2300
x498
264E
Roadside Trees
data structures
,
dp
3000
x396
264D
Colorful Stones
dp
,
two pointers
2500
x406
264C
Choosing Balls
dp
2000
x2660
264B
Good Sequences
dp
,
number theory
1500
x9620
263E
Rhombus
brute force
,
data structures
,
dp
2500
x394
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x403
261D
Maxim and Increasing Subsequence
dp
2600
x553
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x759
261B
Maxim and Restaurant
dp
,
math
,
probabilities
1900
x1360
258D
Little Elephant and Broken Sorting
dp
,
math
,
probabilities
2600
x1210
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1757
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1420
256D
Liars and Serge
dp
2700
x255
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4621
254E
Dormitory
dp
,
implementation
2100
x484
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x10314
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x168
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1011
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x374
248E
Piglet's Birthday
dp
,
math
,
probabilities
2600
x561
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x2964
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x5960
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x208
238E
Meeting Her
dp
,
graphs
,
shortest paths
2600
x338
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1019
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x741
235B
Let's Play Osu!
dp
,
math
,
probabilities
2000
x3344
234F
Fence
dp
1800
x1712
234C
Weather
dp
,
implementation
1300
x5331
232E
Quick Tortoise
bitmasks
,
divide and conquer
,
dp
3000
x673
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x279
232B
Table
bitmasks
,
combinatorics
,
dp
,
math
1900
x1387
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1538
229E
Gifts
combinatorics
,
dp
,
math
,
probabilities
2600
x450
229D
Towers
dp
,
greedy
,
two pointers
2100
x2101
228C
Fractal Detector
dp
,
hashing
2000
x441
225C
Barcode
dp
,
matrices
1700
x8755
223B
Two Strings
data structures
,
dp
,
strings
1900
x1718
222E
Decoding Genome
dp
,
matrices
1900
x2529
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x8592
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6543
217C
Formurosa
divide and conquer
,
dp
,
expression parsing
2600
x312
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x538
213C
Relay Race
dp
2000
x2724
213B
Numbers
combinatorics
,
dp
1900
x1664
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1658
212C
Cowboys
combinatorics
,
dp
,
math
2100
x376
209A
Multicolored Marbles
dp
,
math
1600
x2245
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1785
208B
Solitaire
dfs and similar
,
dp
1900
x1340
204D
Little Elephant and Retro Strings
dp
2400
x396
204A
Little Elephant and Interval
binary search
,
combinatorics
,
dp
1500
x5528
201D
Brand New Problem
bitmasks
,
brute force
,
dp
2600
x388
201C
Fragile Bridges
dp
2000
x1288
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x2962
191A
Dynasty Puzzles
dp
1500
x3806
189A
Cut Ribbon
brute force
,
dp
1300
x62472
187B
AlgoRace
dp
,
shortest paths
1800
x1925
185C
Clever Fat Rat
dp
2500
x130
183D
T-shirt
dp
,
greedy
,
probabilities
2700
x391
182E
Wooden Fence
dp
1800
x1425
180E
Cubes
binary search
,
dp
,
two pointers
1800
x1719
180C
Letter
dp
1400
x7057
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x314
176D
Hyper String
dp
2500
x300
176B
Word Cut
dp
1700
x1713
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x260
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x289
174B
File List
dp
,
greedy
,
implementation
1400
x2190
173C
Spiral Maximum
brute force
,
dp
1900
x957
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2090
166E
Tetrahedron
dp
,
math
,
matrices
1500
x19948
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x346
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6190
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x11876
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1522
163A
Substring and Subsequence
dp
1700
x2617
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x462
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x13559
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4249
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