Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round 973 (Div. 2)
13:46:24
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
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
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1789
75C
Modified GCD
binary search
,
number theory
1600
x12573
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3296
75A
Life Without Zeros
implementation
1000
x25954
74E
Shift It!
constructive algorithms
2800
x151
74D
Hanger
data structures
2400
x369
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x1276
74B
Train
dp
,
games
,
greedy
1500
x1537
74A
Room Leader
implementation
1000
x5097
73F
Plane of Tanks
brute force
,
geometry
2900
x80
73E
Morrowindows
math
,
number theory
2400
x357
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x636
73C
LionAge II
dp
1800
x2114
73B
Need For Brake
binary search
,
greedy
,
sortings
2000
x494
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1333
72I
Goofy Numbers
*special problem
,
implementation
1500
x461
72H
Reverse It!
*special problem
,
implementation
1600
x264
72G
Fibonacci army
*special problem
,
dp
1000
x2172
72F
Oil
*special problem
,
greedy
,
math
1900
x118
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x153
72D
Perse-script
*special problem
,
expression parsing
2300
x74
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x914
72B
INI-file
*special problem
,
implementation
2200
x77
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x185
71E
Nuclear Fusion
bitmasks
,
dp
2200
x708
71D
Solitaire
brute force
,
implementation
2200
x637
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6462
71B
Progress Bar
implementation
,
math
1300
x4497
71A
Way Too Long Words
strings
800
x377872
70E
Information Reform
dp
,
implementation
,
trees
2700
x491
70D
Professor's task
data structures
,
geometry
2700
x986
70C
Lucky Tickets
binary search
,
data structures
,
sortings
,
two pointers
2200
x572
70B
Text Messaging
expression parsing
,
greedy
,
strings
1600
x1760
70A
Cookies
math
1300
x3271
69E
Subsegments
data structures
,
implementation
1800
x4323
69D
Dot
dp
,
games
1900
x990
69C
Game
implementation
2000
x581
69B
Bets
greedy
,
implementation
1200
x3246
69A
Young Physicist
implementation
,
math
1000
x163777
68E
Contact
geometry
2900
x71
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x463
68C
Synchrophasotron
brute force
2200
x308
68B
Energy exchange
binary search
1600
x4414
68A
Irrational problem
implementation
,
number theory
1100
x4922
67E
Save the City!
geometry
2500
x316
67D
Optical Experiment
binary search
,
data structures
,
dp
1900
x1411
67C
Sequence of Balls
dp
2600
x681
67B
Restoration of the Permutation
greedy
1800
x763
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2109
66E
Petya and Post
data structures
,
dp
2000
x732
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3151
66C
Petya and File System
data structures
,
implementation
1800
x1017
66B
Petya and Countryside
brute force
,
implementation
1100
x20431
66A
Petya and Java
implementation
,
strings
1300
x6351
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x93
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x424
65C
Harry Potter and the Golden Snitch
binary search
,
geometry
2100
x784
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1341
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1810
64I
Sort the Table
*special problem
,
sortings
2400
x87
64H
Table Bowling
*special problem
,
sortings
2300
x112
64G
Path Canonization
*special problem
2200
x119
64F
Domain
*special problem
,
expression parsing
2000
x180
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x240
64D
Presents
*special problem
,
greedy
1800
x287
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x337
64B
Expression
*special problem
,
expression parsing
1500
x1012
64A
Factorial
*special problem
,
implementation
1300
x2795
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x752
63D
Dividing Island
constructive algorithms
1900
x1255
63C
Bulls and Cows
brute force
,
implementation
1700
x1674
63B
Settlers' Training
implementation
1200
x4812
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x11294
62E
World Evil
dp
,
flows
2700
x229
62D
Wormhouse
dfs and similar
,
graphs
2300
x359
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x251
62B
Tyndex.Brome
binary search
,
implementation
1800
x1284
62A
A Student's Dream
greedy
,
math
1300
x3434
61E
Enemy is weak
data structures
,
trees
1900
x10881
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6517
61C
Capture Valerian
math
2000
x708
61B
Hard Work
strings
1300
x3849
61A
Ultra-Fast Mathematician
implementation
800
x109555
60E
Mushroom Gnomes
math
,
matrices
2600
x325
60D
Savior
brute force
,
dsu
,
math
2500
x407
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x563
60B
Serial Time!
dfs and similar
,
dsu
1400
x4561
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3603
59E
Shortest Path
graphs
,
shortest paths
2000
x3377
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x625
59C
Title
expression parsing
1600
x2079
59B
Fortune Telling
implementation
,
number theory
1200
x6846
59A
Word
implementation
,
strings
800
x173264
58E
Expression
dp
2400
x361
58D
Calendar
greedy
,
strings
2000
x726
58C
Trees
brute force
1800
x2020
58B
Coins
greedy
1300
x12171
58A
Chat room
greedy
,
strings
1000
x128613
57E
Chess
math
,
shortest paths
3000
x259
57D
Journey
dp
,
math
2500
x337
←
1
2
...
93
94
95
96
97
98
→
User lists
Name