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Frequency Counting

6 min · Java examples

Use a dictionary to count how many times each value appears.

Examples in:PythonJavaScriptTypeScriptJavaC++CC#KotlinGoOCamlRubyPHPDartElixirRustScalaSwift
Java · Frequency Counting0/5 cleared

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Many problems boil down to "how often does each thing show up?" A HashMap is perfect: keys are the items, values are counts.

Increment with counts.put(x, counts.getOrDefault(x, 0) + 1) as you scan the input once.

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