#include <iostream>
#include <string>
#include <vector>
 
std::vector<int> obter_posicoes(std::string texto, std::string elemento){
    std::vector<int> posicoes;
    std::size_t posicao = texto.find(elemento);
 
    while (posicao!=std::string::npos){
        posicoes.push_back(posicao);
        posicao = texto.find("(",posicao+1);
    }
 
    return posicoes;
}
 
int main ()
{
    std::string texto ("Na(CO5(Pt");
    std::vector<int> posicoes = obter_posicoes(texto, "(");
 
    for (auto posicao : posicoes){
        std::cout<<posicao<< " ";
    }
 
 
    return 0;
}
 

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