
Problem Name 
Online Judge 
Contest 
Difficulty Level 
1 
What Goes Up 
UVA 

1 
2 
Strategic Defense Initiative 
UVA 

1 
3 
Building Bridges 
SPOJ 

1 
4 
Easy Longest Increasing Subsequence 
SPOJ 

1 
5 
Wavio Sequence 
UVA 

1 
6 
Stacking Boxes 
UVA 

1 
7 
The Tower of Babylon 
UVA 

1 
8 
In Danger 
SPOJ 

1 
9 
History Grading 
UVA 

1 
10 
Testing the CATCHER 
UVA 

1 
11 
Trainsorting 
UVA 

2 
12 
Another Longest Increasing Subsequence Problem 
SPOJ 

2 
13 
Tower of Cubes 
UVA 

2 
14 
Is Bigger Smarter? 
TJU 

2 
15 
Supernumbers in a permutation 
SPOJ 

2 
16 
BATMAN3 
SPOJ 

2 
17 
Murcia's Skyline 
UVA 

2 
18 
Greenhouse Effect 
Codeforces 
Codeforces Round #165 (Div. 1) & Codeforces Round #165 (Div. 2) 
3 
19 
Building Bridges(HARD) 
SPOJ 

3 
20 
Tiling Up Blocks 
UVA 

3 
21 
Bubble Sort Graph 
Codeforces 
Codeforces Round #198 (Div. 2) & Codeforces Round #198 (Div. 1) 
3 