Create a map m to count the frequency of each implicit character c of the string s.

• Note: The character c is explicit in Rust and C++

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Kotlin

var m = s.groupingBy{ it }.eachCount()

Java

Map<String, Long> m = Stream.of(s.split("")).collect(Collectors.groupingBy(it -> it, Collectors.counting()));

Javascript

let m = new Map(Object.entries(_.countBy(s.split(''))));

Python3

m = Counter(s)

Rust

let m = s.chars().fold(HashMap::new(), |mut m, c| { *m.entry(c).or_insert(0) += 1; m });

C++

using Map = unordered_map<char, int>;
Map m;
for (auto c: s) ++m[c];