text: // #include <iostream>
  // using namespace std;
  
  // see: https://www.cnblogs.com/Braveliu/p/4231818.html
  
  #include<cstdio>
  
  int main() {
      // int a = 20, b = 10;
      // auto fun = [=, &b](int c)->int { return b += a+c;};
      // cout << "fun(100) :" << fun(100) << endl;
      
      int a = 10;
      auto fun = [=](int b)->int {return a+b;};
      int c = fun(100);
      printf("%d", c);
  }
  