#include <iomanip>#include <iostream>#include <vector> int main(){int sz=100;std::vector<int> v; auto cap= v.capacity();std::cout<<"Initial size: "<< v.size()<<", capacity: "<< cap<<'\n'; std::cout<<"\nDemonstrate the capacity's growth policy.""\nSize:  Capacity:  Ratio:\n"<<std::left;while(sz-->0){        v.push_back(sz);if(cap!= v.capacity()){std::cout<<std::setw(7)<< v.size()<<std::setw(11)<< v.capacity()<<std::setw(10)<< v.capacity()/static_cast<float>(cap)<<'\n';            cap= v.capacity();}} std::cout<<"\nFinal size: "<< v.size()<<", capacity: "<< v.capacity()<<'\n';}

Initial size: 0, capacity: 0 Demonstrate the capacity's growth policy.Size:  Capacity:  Ratio:1      1          inf2      2          23      4          25      8          29      16         217     32         233     64         265     128        2 Final size: 100, capacity: 128