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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. template<typename T>
  6. ostream& operator << (ostream& os, vector<T>& vec){
  7.   os << "{";
  8.   for(int i=0; i<vec.size(); i++){
  9.     os << vec[i] << ( i+1 == vec.size() ? "" : "," );
  10.   }
  11.   os << "}";
  12.   return os;
  13. }
  14.  
  15. template<typename V, typename H>
  16. void resize(vector<V>& vec, const H head){
  17.   vec.resize(head);
  18. }
  19.  
  20. template<typename V, typename H, typename ... T>
  21. void resize(vector<V>& vec, const H& head, const T ... tail){
  22.   vec.resize(head);
  23.   for(auto& v: vec) resize(v, tail...);
  24. }
  25.  
  26. int main(){
  27.   vector<vector<vector<int>>> A;
  28.   resize(A, 2,2,3);
  29.  
  30.   cout << A << endl;
  31.   return 0;
  32. }
Success #stdin #stdout 0s 3416KB
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stdin
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Standard input is empty
stdout
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{{{0,0,0},{0,0,0}},{{0,0,0},{0,0,0}}}
https://ideone.com/s4aha1
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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