Solution: Reverse a String¶

Naive ¶

reverse-string-naive.cpp¶

#include <string>
#include <iostream>

using namespace std;



int main()
{
    string s;
    cin >> s;

    string reversed_s;

    for (int i=s.size()-1; i>=0; i--)
        reversed_s += s[i];

    cout << reversed_s << endl;

    return 0;
}

Using `std::reverse<>`¶

reverse-string-reverse.cpp¶

#include <string>
#include <iostream>
#include <algorithm>

using namespace std;


int main()
{
    string s;
    cin >> s;

    std::reverse(s.begin(), s.end());

    cout << s << endl;

    return 0;
}

Using `std::reverse_copy<>`¶

reverse-string-reverse-copy.cpp¶

#include <string>
#include <iostream>
#include <algorithm>

using namespace std;


int main()
{
    string s("abc");

    string reversed_s(s.size(), '*');
    std::reverse_copy(s.cbegin(), s.cend(), reversed_s.begin());
    cout << reversed_s << endl;

    return 0;
}