Initialize
i = index of first 'a'
j = index of first 'b'
n = array length.
MinDist = n+1;
while(i < n && j < n){
MinDist = min(MinDist, abs(i-j))
if(i < j)
i = index of next 'a'
else
j = index of next 'b'
}
--
Best Regards,
Harshal Choudhary.
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