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- #include <iostream>
- using namespace std;
- const int n = 3;
- int used[n + 1];
- int a[n];
- void print() {
- for (int i = 0; i < n; ++i) {
- cout << a[i] << ' ';
- }
- cout << '\n';
- }
- void rec(int idx) {
- for (int i = 1; i <= n; ++i) {
- if (!used[i]) {
- used[i] = true;
- a[idx] = i;
- if (idx == n - 1) {
- print();
- }
- else {
- rec(idx + 1);
- }
- used[i] = false;
- }
- }
- }
- int main() {
- for (int i = 1; i <= n; ++i) {
- used[i] = false;
- }
- rec(0);
- return 0;
- }
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