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Codeforces Round 1002 (Div. 2)
3 days
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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
251B
Playing with Permutations
implementation
,
math
1800
x1284
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x18229
250E
Mad Joe
brute force
2000
x476
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x918
250C
Movie Critics
greedy
1600
x2038
250B
Restoring IPv6
implementation
,
strings
1500
x2014
250A
Paper Work
greedy
1000
x4203
249E
Endless Matrix
math
2600
x330
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x472
248E
Piglet's Birthday
dp
,
math
,
probabilities
2600
x596
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x503
248C
Robo-Footballer
binary search
,
geometry
2000
x857
248B
Chilly Willy
math
,
number theory
1400
x5403
248A
Cupboards
implementation
800
x22957
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x3498
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9571
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2662
246B
Increase and Decrease
greedy
,
math
1300
x11481
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9387
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x7070
245G
Suggested Friends
brute force
,
graphs
2200
x465
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x901
245E
Mishap in Club
greedy
,
implementation
1400
x3319
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2358
245C
Game with Coins
greedy
1700
x1558
245B
Internet Address
implementation
,
strings
1100
x5284
245A
System Administrator
implementation
800
x8575
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4552
244A
Dividing Orange
implementation
900
x8023
243E
Matrix
data structures
3000
x192
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x223
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x531
243B
Hydra
graphs
,
sortings
2000
x1248
243A
The Brand New Function
bitmasks
1600
x4002
242E
XOR on Segment
bitmasks
,
data structures
2000
x9814
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1894
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8966
242B
Big Segment
implementation
,
sortings
1100
x16017
242A
Heads or Tails
brute force
,
implementation
1100
x6448
241G
Challenging Balloons
constructive algorithms
1900
x552
241F
Race
brute force
,
implementation
2300
x266
241E
Flights
graphs
,
shortest paths
2600
x1174
241D
Numbers
2900
x383
241C
Mirror Box
geometry
,
implementation
2000
x513
241B
Friends
binary search
,
bitmasks
,
data structures
,
math
2700
x875
241A
Old Peykan
greedy
1300
x2267
240F
TorCoder
data structures
2600
x2009
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x357
239B
Easy Tape Programming
brute force
,
implementation
1500
x1378
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x19264
238E
Meeting Her
dp
,
graphs
,
shortest paths
2600
x401
238D
Tape Programming
data structures
,
implementation
2900
x253
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1258
238B
Boring Partition
constructive algorithms
1800
x1341
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2056
237E
Build String
flows
,
graphs
2000
x1778
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x577
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5929
237B
Young Table
implementation
,
sortings
1500
x2246
237A
Free Cash
implementation
1000
x27339
236B
Easy Number Challenge
implementation
,
number theory
1300
x14674
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x224004
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x791
235D
Graph Game
graphs
3000
x511
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x2173
235B
Let's Play Osu!
dp
,
math
,
probabilities
2000
x3660
235A
LCM Challenge
number theory
1600
x18271
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x575
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1496
234F
Fence
dp
1800
x1790
234E
Champions' League
implementation
1600
x1004
234D
Cinema
implementation
1600
x1549
234C
Weather
dp
,
implementation
1300
x5613
234B
Reading
sortings
1000
x7195
234A
Lefthanders and Righthanders
implementation
1200
x4500
233B
Non-square Equation
binary search
,
brute force
,
math
1400
x7611
233A
Perfect Permutation
implementation
,
math
800
x43873
232E
Quick Tortoise
bitmasks
,
divide and conquer
,
dp
3000
x708
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x489
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x293
232B
Table
bitmasks
,
combinatorics
,
dp
,
math
1900
x1490
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2604
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1934
231D
Magic Box
brute force
,
geometry
1600
x4148
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x8745
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3645
231A
Team
brute force
,
greedy
800
x345619
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x78995
230A
Dragons
greedy
,
sortings
1000
x82274
229E
Gifts
combinatorics
,
dp
,
math
,
probabilities
2600
x474
229D
Towers
dp
,
greedy
,
two pointers
2100
x2307
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1653
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4812
229A
Shifts
brute force
,
two pointers
1500
x3554
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2539
228D
Zigzag
data structures
2100
x387
228C
Fractal Detector
dp
,
hashing
2000
x470
228B
Two Tables
brute force
,
implementation
1400
x3485
228A
Is your horseshoe on the other hoof?
implementation
800
x115726
227B
Effective Approach
implementation
1100
x28911
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