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Problems
#
Name
309A
Morning run
binary search
,
math
,
two pointers
2000
x530
306D
Polygon
constructive algorithms
,
geometry
2300
x327
306C
White, Black and White Again
combinatorics
,
number theory
2100
x627
306B
Optimizer
data structures
,
greedy
,
sortings
2100
x517
306A
Candies
implementation
800
x8175
305E
Playing with String
games
2300
x731
305D
Olya and Graph
combinatorics
,
math
2200
x555
305C
Ivan and Powers of Two
greedy
,
implementation
1600
x2658
305B
Continued Fractions
brute force
,
implementation
,
math
1700
x2289
305A
Strange Addition
brute force
,
constructive algorithms
,
implementation
1600
x5222
304B
Calendar
brute force
,
implementation
1300
x3158
304A
Pythagorean Theorem II
brute force
,
math
1200
x12039
303E
Random Ranking
dp
,
math
,
probabilities
3000
x383
303D
Rotatable Number
math
,
number theory
2600
x352
303C
Minimum Modular
brute force
,
graphs
,
math
,
number theory
2400
x967
303B
Rectangle Puzzle II
implementation
,
math
1700
x1424
303A
Lucky Permutation Triple
constructive algorithms
,
implementation
,
math
1300
x8570
302B
Eugeny and Play List
binary search
,
implementation
,
two pointers
1200
x9391
302A
Eugeny and Array
implementation
800
x9761
301E
Yaroslav and Arrangements
dp
2800
x406
301D
Yaroslav and Divisors
data structures
2200
x3022
301C
Yaroslav and Algorithm
constructive algorithms
2500
x488
301B
Yaroslav and Time
binary search
,
graphs
,
shortest paths
2100
x2796
301A
Yaroslav and Sequence
constructive algorithms
1800
x3256
300E
Empire Strikes Back
binary search
,
math
,
number theory
2300
x1105
300D
Painting Square
dp
,
fft
2300
x855
300C
Beautiful Numbers
brute force
,
combinatorics
1800
x11758
300B
Coach
brute force
,
dfs and similar
,
graphs
1500
x7148
300A
Array
brute force
,
constructive algorithms
,
implementation
1100
x27211
299B
Ksusha the Squirrel
brute force
,
implementation
900
x6440
299A
Ksusha and Array
brute force
,
number theory
,
sortings
1000
x9460
298B
Sail
brute force
,
greedy
,
implementation
1200
x15801
298A
Snow Footprints
greedy
,
implementation
1300
x11659
297E
Mystic Carvings
data structures
3000
x433
297D
Color the Carpet
constructive algorithms
2500
x628
297C
Splitting the Uniqueness
constructive algorithms
2400
x1020
297B
Fish Weight
constructive algorithms
,
greedy
1600
x3766
297A
Parity Game
constructive algorithms
1700
x3860
296B
Yaroslav and Two Strings
combinatorics
,
dp
2000
x2682
296A
Yaroslav and Permutations
greedy
,
math
1100
x26038
295E
Yaroslav and Points
data structures
2500
x818
295D
Greg and Caves
combinatorics
,
dp
2400
x740
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1939
295B
Greg and Graph
dp
,
graphs
,
shortest paths
1700
x17657
295A
Greg and Array
data structures
,
implementation
1400
x26006
294E
Shaass the Great
dp
,
trees
2300
x1114
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x378
294C
Shaass and Lights
combinatorics
,
number theory
1900
x4353
294B
Shaass and Bookshelf
dp
,
greedy
1700
x5036
294A
Shaass and Oskols
implementation
,
math
800
x28390
293E
Close Vertices
data structures
,
divide and conquer
,
trees
2700
x1980
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x261
293C
Cube Problem
brute force
,
math
,
number theory
2400
x635
293B
Distinct Paths
brute force
,
combinatorics
2700
x941
293A
Weird Game
games
,
greedy
1500
x3196
292E
Copying Data
data structures
1900
x4883
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x2770
292C
Beautiful IP Addresses
brute force
2000
x1312
292B
Network Topology
graphs
,
implementation
1200
x10513
292A
SMSC
implementation
1100
x2864
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1577
291D
Parallel Programming
*special problem
,
greedy
1600
x1539
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1852
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3087
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x6476
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x153
290E
HQ
*special problem
,
constructive algorithms
2500
x226
290D
Orange
*special problem
,
implementation
1400
x1904
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1672
290B
QR code
*special problem
,
implementation
1500
x2617
290A
Mysterious strings
*special problem
,
implementation
1400
x3236
289B
Polo the Penguin and Matrix
brute force
,
dp
,
implementation
,
sortings
,
ternary search
1400
x18963
289A
Polo the Penguin and Segments
brute force
,
implementation
1100
x10327
288E
Polo the Penguin and Lucky Numbers
dp
,
implementation
,
math
2800
x347
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x838
288C
Polo the Penguin and XOR operation
implementation
,
math
1700
x2457
288B
Polo the Penguin and Houses
combinatorics
1500
x3211
288A
Polo the Penguin and Strings
greedy
1300
x6754
287B
Pipeline
binary search
,
math
1700
x11537
287A
IQ Test
brute force
,
implementation
1100
x21984
286E
Ladies' Shop
constructive algorithms
,
fft
,
math
2800
x1020
286D
Tourists
data structures
,
sortings
2600
x457
286C
Main Sequence
greedy
,
implementation
2100
x1602
286B
Shifting
implementation
2200
x1172
286A
Lucky Permutation
constructive algorithms
,
math
1400
x3450
285E
Positions in Permutations
combinatorics
,
dp
,
math
2600
x1294
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1676
285C
Building Permutation
greedy
,
implementation
,
sortings
1200
x26331
285B
Find Marble
implementation
1200
x15696
285A
Slightly Decreasing Permutations
greedy
,
implementation
1100
x14138
284B
Cows and Poker Game
brute force
,
implementation
1000
x7364
284A
Cows and Primitive Roots
implementation
,
math
,
number theory
1400
x7345
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x856
283D
Cows and Cool Sequences
dp
,
math
,
number theory
2400
x641
283C
Coin Troubles
dp
2100
x1566
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3931
283A
Cows and Sequence
constructive algorithms
,
data structures
,
implementation
1600
x6872
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x4327
282D
Yet Another Number Game
dp
,
games
2100
x1615
282C
XOR and OR
constructive algorithms
,
implementation
,
math
1500
x10183
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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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