C++ Code removes first character from vector to int conversion - c++

Question

Below is my code, CP Code represents a template.
For sometime, I have been trying to figure out why the function splitStringOutInt removes the first character. For example, the input is 11 12 13, but the output is [1, 12, 13]. I am very lost, also I am new to C++ so if there is a better method to convert a string line input to an array/vector, please let me know.
// START CP CODE
#include <sstream>
#include <iostream>
#include <vector>
#include <string>
using namespace std;
string cinLine()
{
cin.ignore();
string tempVar {};
getline(cin, tempVar);
return tempVar;
}
long long int stringToInt(string num)
{
long long int convertedVal = 0;
stringstream strConverterOBJ;
strConverterOBJ << num;
strConverterOBJ >> convertedVal;
return convertedVal;
}
int printIntVector(vector<long long int> lst)
{
cout << "[";
for(int i=0; i<lst.size(); i++){
if(i!=lst.size()-1) {
cout << lst.at(i) << ", ";
}else{
cout << lst.at(i);
}
}
cout << "]" << endl;
return 0;
}
string printStrVector(vector<string> lst)
{
for(int i=0; i<lst.size(); i++){
if(i!=lst.size()-1) {
cout << lst.at(i) << endl;
}else{
cout << lst.at(i);
}
}
return "";
}
vector<long long int> splitStringOutInt(char divider, string str)
{
vector<long long int> intList;
for(long long int j=0; j<=str.length(); j++){
long long int answer {};
if(str[j] == divider || j == str.length()){
answer = stringToInt(str.substr(0, j+1));
str.erase(0,j+1);
intList.insert(intList.end(), answer);
j=0;
}
}
return intList;
}
// END CP CODE
int main()
{
vector<long long int> inp1;
inp1 = splitStringOutInt(' ', cinLine());
printIntVector(inp1);
return 0;
}