I tried the most manual approach to do these. I am not sure if these the best way to do it . PLease someone try and lets discuss if these is an acceptable answer for interviewer or not . string timeConversion(string s) { vector result; stringstream ss(s); string strToken;

while(getline(ss,strToken,':')){
    result.push_back(strToken);
}

if(result[2][2] == 'A'){
    if(result[0] == "12"){
        result[0] = "00";
    }
}
else{
    int value = stoi(result[0]);
    if(value >= 1 && value <= 11){
        result[0] = to_string(12 + value);
    }
}

string ans = result[0] + ":" + result[1] + ":" + result[2].erase(4-2);
return ans;  

}