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  1. #include <unordered_map>
  2. #include <algorithm>
  3. #include <iostream>
  4. #include <string>
  5. #include <stack>
  6.  
  7. template<typename BiIter> void run(BiIter first, BiIter last) {
  8.     std::size_t dp=0;
  9.     std::unordered_map<std::size_t, int> data;
  10.     std::stack<BiIter> jmps;
  11.  
  12.     for(auto it=first; it!=last; ++it) {
  13.         switch(*it) {
  14.         case '>': ++dp;       break;
  15.         case '<': --dp;       break;
  16.         case '+': ++data[dp]; break;
  17.         case '-': --data[dp]; break;
  18.         case '.': 
  19.             std::cout << static_cast<char>(data[dp]);
  20.             break;
  21.         case ',': {
  22.             char c;
  23.             std::cin >> c;
  24.             data[dp]=c;
  25.             break;
  26.         }
  27.         case '[': 
  28.             if(data[dp]==0) 
  29.                it=std::find(it, last, ']');
  30.             else 
  31.                jmps.push(it);
  32.             break;
  33.         case ']': 
  34.             it=jmps.top()-1;
  35.             jmps.pop();
  36.             break;
  37.         }   
  38.     }   
  39. }   
  40. void run(const std::string& code) { run(code.begin(), code.end()); }
  41. int main() {
  42.     std::string program="++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.";
  43.     run(program);
  44. }
Success #stdin #stdout 0s 3024KB
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Hello World!
https://ideone.com/hleNL8
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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