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Algorithms/Combination(Recursion).cpp at master · MyFirstRandomTest/Algorithms · GitHub

32 lines (28 loc) · 393 Bytes

#include <cstdio>
#define MOD 1000000000
#define MAX 1000
int C[MAX][MAX];
void init_C()
	for (int i = 0; i < MAX; i++)
		C[i][0] = 1;
	for (int i = 1; i < MAX; i++)
		for (int j = 1; j <= i; j++)
			C[i][j] = (C[i - 1][j] + C[i - 1][j - 1]) % MOD;
	while (scanf("%d%d", &n, &m) > 0)
		printf("%d\n", C[n][m]);

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