Jewels and Stones

help
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1

http://www.codechef.com/viewsolution/6419925

CAN ANY ONE GIVE A TEST CASE WHERE ABOVE SOLUTION FAILS, I AM NOT ALE TO FIGURE OUT help.
for the problem,----
http://www.codechef.com/problems/STONES/

2

Try this
1
aaa
a
Answer should be 1.

3

thnx a lot!!!