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c++14stdvectorstdstring

Conversion of std::string indices to integer in a std::vector

I want to access the last two index of std::string in a std::vector and then converting them to integer.But somehow I can not access it.Is there any optimal way for that?Thanks in advance

eg:say if the string is 6513494.Then the expected output for vector[i]will be 9 and 4 

int n;string s;cin>>n;
vector<string>v;
for(int i=0;i<n;++i)
{
    cin>>s;v.push_back(s);
}
for(int i=0;i<v.size();++i)if(v[s[s.size()-1]]-'0'==0&&v[s[s.size()-2]]-'0')cout<<v[i]<<endl;
Solution

  • Try this, I believe it will help with what you wanted :)

        int n, val, ln;
    string s;
    cin>>n;
    vector<int>v;

    for(int i=0;i<n;++i)
    {
        cin>>s;
        ln = s.size();
        val = (s[ln-2]-'0') * 10 + (s[ln-1]-'0');
        v.push_back(val);
    }

    for(int i=0;i<v.size();++i){
        printf("%d\n", v[i]);
    }