Printing all occurrence (indexes) of a particular character in a string in c++

#include <iostream>

#include <vector>

#include <algorithm>

using namespace std;

int main() {

string st="mississipi";

vector<char>s;

copy(st.begin(),st.end(),back_inserter(s)); // converting string to vector

s.push_back('\0');       //  converting string to vector

vector<char>::iterator it=s.begin();

int i=-1;

while(1){

    

it=find(s.begin()+i+1,s.end(),'s'); //once we find first 's' reduce the search range

if(it == s.end())

        break;

i=it-s.begin();  // storing index of the occurrence of 's' in string 

cout<<i;

}

return 0;

}