Frequency Counting
6 min · C examples
Use a dictionary to count how many times each value appears.
C · Frequency Counting0/5 cleared
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Many problems boil down to "how often does each thing show up?" C has no built-in hash map, but a fixed-size array works great when items are letters: index by ch - 'a'.
Increment with counts[ch - 'a']++ as you scan the input once.
You
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