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- #include <bits/stdc++.h>
- #define int long long
- using namespace std;
- int build(int n, int k) {
- int res = 0;
- vector<vector<int>> b;
- b.resize(n + 1);
- for (int i = 0; i < n + 1; ++i) {
- b[i].resize(n + 1);
- }
- for (int i = 0; i <= n; ++i) {
- b[i][0] = 1;
- b[i][i] = 1;
- for (int t = 1; t < i; ++t) {
- b[i][t] = b[i - 1][t - 1] + b[i - 1][t];
- }
- }
- res = b[n][k];
- return res;
- }
- int32_t main() {
- ios_base::sync_with_stdio(0);
- cin.tie(0);
- cout.tie(0);
- int n, k;
- cin >> n >> k;
- int res = build(n, k);
- cout << res << '\n';
- return 0;
- }
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