stringstreamwhitespace, C++ (vc++)

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//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64

#include <iostream>
#include <stack>
#include <vector>
#include <sstream>

using namespace std;

stack<int> operands;
stack<char> operators;

template <typename T>
void print_stack(string name, stack<T> _stack) {
    cout<<"Dumping "<<name<<" => ";
    for(;!_stack.empty(); _stack.pop()) {
        cout<<_stack.top()<<" ";
    }
    cout<<endl;
}

void build_stack(const string& str) {
    istringstream ss(str);
    
    char op;
    int op1, op2;
    ss>>skipws>>op1;
    operands.push(op1);
    while(!ss.eof()) {
        ss>>op;
        operators.push(op);
        ss>>op2;
        operands.push(op2);
    }
}

int main()
{
    vector<string> inputs = {" 3+5 / 2 ", " 3+5/2", " 3+5 /2", " 3+5/2 "};
    for(const auto& str : inputs) {
        build_stack(str);
        cout<<"stack for "<<str<<" -> "<<endl;
        print_stack("operands", operands);
        print_stack("operators", operators);
        
        operators = {};
        operands = {};
        cout<<endl;
    }
}

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Compilation time: 2,09 sec, absolute running time: 0,34 sec, absolute service time: 2,44 sec