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  1. #include <unordered_map>
  2. #include <algorithm>
  3. #include <string>
  4. #include <iostream>
  5.  
  6. int main() {
  7.     std::string input = "hello world";
  8.     std::unordered_map<char, unsigned int> counts;
  9.     std::for_each(std::begin(input), std::end(input), [&counts](char c) {
  10.         counts[c]++;
  11.     });
  12.     for(auto& kv: counts) {
  13.         std::cout << kv.first << ": " << kv.second << "\n";
  14.     }
  15.     return 0;
  16. }
Success #stdin #stdout 0s 3476KB
comments (?)
stdin 
Standard input is empty
stdout 
r: 1
 : 1
d: 1
o: 2
w: 1
l: 3
e: 1
h: 1
https://ideone.com/8NFWnu
считаем количество разных символов в строке
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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