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PROBLEMS
STATUS
RANKS
DISCUSS
CONTESTS
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Classical
Challenge
Partial
Tutorial
Riddle
Basics
#tags
ID
NAME
QUALITY
USERS
ACC %
DIFFICULTY
C
I
4580
ABCDEF
216
7769
14
16
7386
Activities
61
1415
16
19
28404
Ada and Field
33
547
21
17
297
Aggressive cows
1055
39834
16
23
15454
How to Handle the Fans
39
1505
12
11
4560
The Double HeLiX
146
8770
12
10
28407
Busqueda Binaria
464
1
1
28467
Búsqueda Binaria 2
1
332
27380
Painting Hat
6
252
11
12
19301
Operators (new ver)
3
40
38
17
43
Copying Books
44
2710
19
19
36671
Bipartite Permutation (Hard)
6
51
32
34
14742
Building Bridges(HARD)
10
443
14
17
6168
Building Bridges
27
1637
11
17
110
Fill the Cisterns
28
1398
21
20
5296
Air Combat
-1
64
34
35669
Consecutive Letters
8
433
16
19
13780
Audition
17
639
17
17
6956
IOI2009 Mecho
3
159
28
23
10810
Its a Murder!
55
2351
16
17
27039
Assembly line
17
511
17
14
11814
Eko
171
14557
13
14
5161
Factorial vs Power
14
1111
13
15
5970
Finding Primes
22
1326
16
15
18530
Font Size
7
199
15
5
5978
Frequent Prime Ranges
9
688
13
13
18185
Give Away
31
993
20
18
2738
Number Guessing Game
42
4626
8
13
9734
Hacking the random number generator
61
5724
8
6
4200
Hamster flight
13
1149
5
13
37921
Birthday Present
3
37
42
34
36951
HowManyLis
6
122
19
21
8002
Horrible Queries
396
10699
19
18
37465
Do you know Factorials
1
7
18247
Arrangement Validity
11
211
17
21
4415
Power of Integer
1
268
17
26
8985
Line up
19
388
16
17
1431
Projections Of A Polygon
2
115
9
1
36667
Solution to all the problems
12
141
15
10
20063
Large subsequence Problem
20
441
10
14
34356
Ludic Numbers (medium)
5
59
36
39
3975
Most Servings Meal
8
349
28
28
148
Land for Motorways
3
205
17
17
34479
Möbius function zero distribution
4
15
6
17
4061
Polygon
4
211
21
17
4483
Roads Repair
7
177
20
23
27321
Increasing numbers
17
547
13
19
2905
Not a Triangle
92
4959
11
11
25024
Nth Prime
6
84
34
39
12151
Pizzamania
28
2128
5
4
#binary-search
Binary search algorithm finds the position of a target value within a sorted array