In this where we are storing the last occurrence of the character how can we access the array element with visited[a[i]] where a[i] is a character?
Regarding maintaining the array
@sukhwinder9813 We are maintaining a map of character with index of last occurrence.
So a[i] is the character and visited array is the map which maps character with index location. visited[a[i]] will store the index of last occurrence of character a[i]. a[i] is a character so its ascii value will be treated in visited[a[i]].
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