偷懒用 string ，并且只交换行下标

#include <bits/stdc++.h>
using namespace std;

#define DBG(x) cout << #x << "=" << x << endl

const int N = 5;
int idxs[] = {-1, 1, 2, 3, 4, 5};
string g[N + 1];

void solve() {
  int m, n;

  for (int i = 1; i <= N; i++)
    getline(cin, g[i]);
  cin >> m >> n;
  swap(idxs[m], idxs[n]);

  for (int i = 1; i <= N; i++)
    cout << g[idxs[i]] << endl;
}

int main() {
  solve();

  return 0;
}