sign in
sign up
forgot
Toggle navigation
PROBLEMS
STATUS
RANKS
DISCUSS
CONTESTS
sign in
Classical
Challenge
Partial
Tutorial
Riddle
Basics
#tags
ID
NAME
QUALITY
USERS
ACC %
DIFFICULTY
C
I
4580
ABCDEF
178
6040
13
16
7386
Activities
46
1147
15
19
28404
Ada and Field
28
259
21
17
297
Aggressive cows
679
15133
16
22
15454
How to Handle the Fans
30
1226
11
11
4560
The Double HeLiX
105
5677
11
10
28407
Busqueda Binaria
1
290
1
1
28467
Búsqueda Binaria 2
1
178
27380
Painting Hat
5
229
12
13
19301
Operators (new ver)
1
28
42
17
43
Copying Books
28
1763
19
19
36671
Bipartite Permutation (Hard)
2
3
26
34
14742
Building Bridges(HARD)
9
331
13
15
6168
Building Bridges
22
1333
10
15
110
Fill the Cisterns
25
1171
20
21
5296
Air Combat
54
35669
Consecutive Letters
3
54
17
17
13780
Audition
13
564
16
19
6956
IOI2009 Mecho
3
150
28
23
10810
Its a Murder!
42
1903
16
17
34389
Duck Game
0
27039
Assembly line
15
384
15
14
11814
Eko
99
3644
12
13
5161
Factorial vs Power
13
968
13
14
5970
Finding Primes
20
1020
16
14
18530
Font Size
4
183
12
3
5978
Frequent Prime Ranges
5
592
13
10
18185
Give Away
19
247
23
20
2738
Number Guessing Game
37
4556
6
12
9734
Hacking the random number generator
46
4439
7
6
4200
Hamster flight
12
1065
5
12
8002
Horrible Queries
323
8203
20
18
18247
Arrangement Validity
7
147
17
22
4415
Power of Integer
1
261
17
26
8985
Line up
16
299
17
18
1431
Projections Of A Polygon
2
104
9
1
36667
Solution to all the problems
7
28
13
9
20063
Large subsequence Problem
16
398
9
13
34356
Ludic Numbers (medium)
1
4
50
50
3975
Most Servings Meal
6
279
26
28
148
Land for Motorways
1
193
17
17
34479
Möbius function zero distribution
4
5
6
17
4061
Polygon
2
196
17
12
4483
Roads Repair
6
167
17
24
27321
Increasing numbers
12
256
12
19
2905
Not a Triangle
72
3864
11
11
25024
Nth Prime
2
33
26
34
12151
Pizzamania
29
1802
5
4
3273
Order statistic set
119
2524
22
21
16579
Count the Pairs
29
971
5
5
#binary-search
Binary search algorithm finds the position of a target value within a sorted array