Hackerrank StringStream Solution
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stringstream is a stream class to operate on strings. It basically implements input/output operations on memory (string) based streams. stringstream can be helpful in different type of parsing. The following operators/functions are commonly used here
- Operator >> Extracts formatted data.
- Operator << Inserts formatted data.
- Method str() Gets the contents of underlying string device object.
- Method str(string) Sets the contents of underlying string device object.
Its header file is sstream.
One common use of this class is to parse comma-separated integers from a string (e.g., "23,4,56").
stringstream ss("23,4,56");
char ch;
int a, b, c;
ss >> a >> ch >> b >> ch >> c; // a = 23, b = 4, c = 56You have to complete the function vector parseInts(string str). str will be a string consisting of comma-separated integers, and you have to return a vector of int representing the integers.
Note If you want to know how to push elements in a vector, solve the first problem in the STL chapter.
Input Format
The first and only line consists of n integers separated by commas.
Output Format
Print the integers after parsing it.
P.S.: I/O will be automatically handled. You need to complete the function only.
Sample Input
23,4,56Sample Output
23
4
56Solution in cpp#
Approach 1.
#include <sstream>
#include <vector>
#include <iostream>
using namespace std;
vector<int> parseInts(string str) {
vector<int> result;
stringstream ss;
ss << str;
int temp;
char ch;
while(ss >> temp) {
result.push_back(temp);
ss >> ch;
}
return result;
}
int main() {
string str;
cin >> str;
vector<int> integers = parseInts(str);
for(int i = 0; i < integers.size(); i++) {
cout << integers[i] << "\n";
}
return 0;
}Approach 2.
#include <sstream>
#include <vector>
#include <iostream>
using namespace std;
vector<int> parseInts(string str) {
// Complete this function
vector<int> par;
char ch;
int tmp;
stringstream ss(str);
while (ss >> tmp) {
par.push_back(tmp);
ss >> ch;
}
return par;
}
int main() {
string str;
cin >> str;
vector<int> integers = parseInts(str);
for(int i = 0; i < integers.size(); i++) {
cout << integers[i] << "\n";
}
return 0;
}Approach 3.
#include <sstream>
#include <vector>
#include <iostream>
using namespace std;
vector<int> parseInts(string str) {
// Complete this function
stringstream ss(str);
char ch;
int temp;
vector<int> par;
while (ss >> temp) {
par.push_back(temp);
ss >> ch;
}
return par;
}
int main() {
string str;
cin >> str;
vector<int> integers = parseInts(str);
for(int i = 0; i < integers.size(); i++) {
cout << integers[i] << "\n";
}
return 0;
}
