Tpb32 3/2/2020

#include <iostream>
#include <cstring>
using namespace std;

#define tokens " "
#define NMAX 1000
char v[NMAX][NMAX], s[NMAX], revs[NMAX];
int n;

void rev(char s[])
{
    int n = strlen(s);
    for (int i = 0; i < n / 2; i++)
        swap(s[i], s[n - i - 1]);
}

int main()
{
    cin.getline(s, NMAX);
    char *p = strtok(s, tokens);
    while (p)
    {
        strcpy(v[n], p);
        n++;
        p = strtok(NULL, tokens);
    }

    for (int i = 0; i < n - 1; i++)
        for (int j = i + 1; j < n; j++)
        {
            strcpy(revs, v[j]);
            rev(revs);
            if (!strcmp(revs, v[i]))
                cout << v[i] << ' ' << v[j] << endl;
        }
    return 0;
}