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Codeforces Round 961 (Div. 2)
17:19:42
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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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Problems
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Status
Standings
Custom test
Problems
#
Name
280B
Maximum Xor Secondary
data structures
,
implementation
,
two pointers
1800
x4483
280A
Rectangle Puzzle
geometry
2000
x1453
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1420
279D
The Minimum Number of Variables
bitmasks
,
dp
2200
x719
279C
Ladder
dp
,
implementation
,
two pointers
1700
x8145
279B
Books
binary search
,
brute force
,
implementation
,
two pointers
1400
x50161
279A
Point on Spiral
brute force
,
geometry
,
implementation
1400
x5549
278B
New Problem
brute force
,
strings
1500
x3435
278A
Circle Line
implementation
800
x11557
277E
Binary Tree on Plane
flows
,
trees
2400
x1254
277D
Google Code Jam
dp
,
probabilities
2800
x331
277C
Game
games
,
implementation
2400
x448
277B
Set of Points
constructive algorithms
,
geometry
2300
x791
277A
Learning Languages
dfs and similar
,
dsu
1400
x18447
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1573
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x13418
276C
Little Girl and Maximum Sum
data structures
,
greedy
,
implementation
,
sortings
1500
x25160
276B
Little Girl and Game
games
,
greedy
1300
x27896
276A
Lunch Rush
implementation
900
x27164
275B
Convex Shape
constructive algorithms
,
implementation
1700
x2800
275A
Lights Out
implementation
900
x29324
274E
Mirror Room
data structures
,
implementation
3000
x306
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1017
274C
The Last Hole!
brute force
,
geometry
2600
x348
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4943
274A
k-Multiple Free Set
binary search
,
greedy
,
sortings
1500
x9948
273E
Dima and Game
dp
,
games
2600
x363
273D
Dima and Figure
dp
2400
x391
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1210
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2601
272C
Dima and Staircase
data structures
,
implementation
1500
x6721
272B
Dima and Sequence
implementation
,
math
1400
x3976
272A
Dima and Friends
implementation
,
math
1000
x24020
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x482
271D
Good Substrings
data structures
,
strings
1800
x10771
271C
Secret
constructive algorithms
,
implementation
1500
x2921
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x12717
271A
Beautiful Year
brute force
800
x131942
270B
Multithreading
data structures
,
greedy
,
implementation
1400
x4105
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x44388
269E
String Theory
geometry
,
math
,
strings
3100
x108
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x446
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1627
269B
Greenhouse Effect
dp
1700
x6221
269A
Magical Boxes
greedy
,
math
1600
x3495
268E
Playlist
math
,
probabilities
,
sortings
2100
x982
268D
Wall Bars
dp
2300
x504
268C
Beautiful Sets of Points
constructive algorithms
,
implementation
1500
x13508
268B
Buttons
implementation
,
math
1000
x31607
268A
Games
brute force
800
x83544
267C
Berland Traffic
math
,
matrices
2700
x160
267B
Dominoes
dfs and similar
,
graphs
2000
x621
267A
Subtractions
math
,
number theory
900
x7313
266E
More Queries to Array...
data structures
,
math
2500
x771
266D
BerDonalds
graphs
,
math
,
shortest paths
2400
x759
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1340
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x130371
266A
Stones on the Table
implementation
800
x183416
265B
Roadside Trees (Simplified Edition)
greedy
,
implementation
1000
x17036
265A
Colorful Stones (Simplified Edition)
implementation
800
x35458
264E
Roadside Trees
data structures
,
dp
3000
x427
264D
Colorful Stones
dp
,
two pointers
2500
x411
264C
Choosing Balls
dp
2000
x2806
264B
Good Sequences
dp
,
number theory
1500
x9883
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10678
263E
Rhombus
brute force
,
data structures
,
dp
2500
x397
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3393
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1064
263B
Squares
greedy
,
implementation
,
sortings
900
x8816
263A
Beautiful Matrix
implementation
800
x233343
262B
Roma and Changing Signs
greedy
1200
x11140
262A
Roma and Lucky Numbers
implementation
800
x19475
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x407
261D
Maxim and Increasing Subsequence
dp
2600
x556
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x765
261B
Maxim and Restaurant
dp
,
math
,
probabilities
1900
x1377
261A
Maxim and Discounts
greedy
,
sortings
1400
x5129
260E
Dividing Kingdom
binary search
,
brute force
,
data structures
2500
x453
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1520
260C
Balls and Boxes
constructive algorithms
,
greedy
,
implementation
1700
x2943
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3784
260A
Adding Digits
implementation
,
math
1400
x14373
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x13831
259A
Little Elephant and Chess
brute force
,
strings
1000
x9001
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1078
258D
Little Elephant and Broken Sorting
dp
,
math
,
probabilities
2600
x1238
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1770
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1429
258A
Little Elephant and Bits
greedy
,
math
1100
x22459
257E
Greedy Elevator
data structures
,
implementation
2200
x281
257D
Sum
greedy
,
math
1900
x1561
257C
View Angle
brute force
,
geometry
,
math
1800
x4248
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x6952
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6431
256E
Lucky Arrays
data structures
2400
x659
256D
Liars and Serge
dp
2700
x256
255E
Furlo and Rublo and Game
games
,
implementation
,
math
2200
x836
255D
Mr. Bender and Square
binary search
,
implementation
,
math
1800
x1940
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4665
255B
Code Parsing
implementation
1200
x4914
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