Problem
Given a string S, find the minimum number of insertions required to make all characters unique (only insert new characters, not replace).
Input format
Input
input.txt
- String S (1–26, lowercase, may have repeats)
Output format
Output
output.txt
- Integer: minimum number of insertions needed
Example
input
aabc
output
2
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Sample cases (from the problem)
Sample Case 1
Input
aabc
Expected output
2
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