Frequency Counting
6 min · Python examples
Use a dictionary to count how many times each value appears.
Techniques · Frequency Counting0/5 cleared
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Many problems boil down to "how often does each thing show up?" A dictionary (hash map) is perfect: keys are the items, values are counts.
Increment with counts[x] = counts.get(x, 0) + 1 as you scan the input once.
You
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Target output: 3
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