There is a run error
hello @ashish_arora369
for i =0 ,i-1 will be -1 and in the highlighted part u will try to access -1 index ,which will give u error.
here it should be ==
also u r overcomplicating this
the idea is simple use hastable/array to store frequency (make it of size 256).
now iterate the string from start to end and increment the count of current charater in ur hashtable.
and then print that character which has maximum count
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