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2838 . Escape from the Hell
TopCoder
Input Format
Output Format
Sample Input 1
3 9 6 3 5 2 3 1 2 2 2
Sample Output 1
2
Sample Input 2
5 20 3 2 4 2 6 3 8 4 10 5 4 2 3 4 5
Sample Output 2
-1
Sample Input 3
5 20 6 5 7 3 10 3 10 14 4 7 2 5 3 9 2
Sample Output 3
3
Sample Input 4
4 12 8 4 6 4 2 1 2 1 1 1 4 4
Sample Output 4
-1
Hints
Problem Source
Migrated from old NTUJ.
Subtasks
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