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Jaemin/Combinatorics/Combinatorics_이항계수와쿼리_13977/Combinatorics_이항계수와쿼리_13977.sln

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Jaemin/Combinatorics/Combinatorics_이항계수와쿼리_13977/Combinatorics_이항계수와쿼리_13977/Combinatorics_이항계수와쿼리_13977.cpp

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+#include <iostream>
+#include <vector>
+#include <algorithm>
+#include <math.h>
+using namespace std;
+int M, N, K;
+const int p = 1000000007;
+long long factorial[4000001];
+void fact() {
+	factorial[0] = 1;
+	for (int i = 0; i < 4000000; i++) {
+		factorial[i + 1] = factorial[i] * (i + 1);
+		factorial[i + 1] %= p;
+	}
+}
+int main() {
+	ios_base::sync_with_stdio(false);
+	cin.tie(NULL);
+	cout.tie(NULL);
+
+	// ���丮�� DP ���� O(N)
+	fact();
+	cin >> M;
+	for (int epoch = 0; epoch < M; epoch++) {
+		cin >> N >> K;
+
+		long long left = factorial[N];
+		long long mid = factorial[N-K];
+		long long right = factorial[K];
+		long long num = p - 2;
+
+		long long right_pow = 1;
+		long long mid_pow = 1;
+		while (num != 0) {
+			if (num % 2 != 0) {
+				right_pow *= right;
+				right_pow %= p;
+				mid_pow *= mid;
+				mid_pow %= p;
+			}
+			mid *= mid;
+			mid %= p;
+			right *= right;
+			right %= p;
+			num /= 2;
+		}
+
+		long long ret = ((left * right_pow) % p * mid_pow) % p;
+
+		cout << ret << '\n';
+	}
+
+	return 0;
+}

Jaemin/Combinatorics/Combinatorics_이항계수와쿼리_13977/Combinatorics_이항계수와쿼리_13977/Combinatorics_이항계수와쿼리_13977.vcxproj

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Jaemin/Combinatorics/Combinatorics_이항계수와쿼리_13977/Combinatorics_이항계수와쿼리_13977/Combinatorics_이항계수와쿼리_13977.vcxproj.filters

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