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34 lines
609 B
34 lines
609 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 100010;
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int n, k;
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vector<int> path;
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bool st[N];
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void dfs(int step) {
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if (step == k + 1) {
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cout << "(";
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for (int i = 0; i < path.size() - 1; ++i) {
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cout << path[i] << ",";
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}
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cout << path.back() << ")";
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return;
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}
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for (int i = 1; i <= n; i++) {
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if (!st[i]) {
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path.push_back(i);
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st[i] = true;
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dfs(step + 1);
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st[i] = false;
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path.pop_back();
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}
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}
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}
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int main() {
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cin >> n >> k;
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dfs(1);
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return 0;
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}
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