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  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4.  
  5. int main()
  6. {
  7. 	std::vector<std::vector<int>> matrix = { { 1, 2 }, {3, 4, 5}, {6} };
  8. 	size_t size = 0;
  9. 	std::for_each(matrix.begin(), matrix.end(), [&size](std::vector<int> &vec) {
  10.         size += vec.size();
  11.     });
  12.     std::cout << size << '\n';
  13. }
Success #stdin #stdout 0s 3272KB
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https://ideone.com/Vt2E1g
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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