60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
#include <cstdio>
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#include <cstring>
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#define MAXN 1001
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__int64 com[MAXN][MAXN];
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void get_Combination(int n)
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{
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int i, j;
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memset(com, 0, sizeof(com));
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com[0][0] = 1;
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for (i = 1; i <= n; i++)
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{
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com[i][0] = 1;
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for (j = 1; j <= i; j++) com[i][j] = com[i-1][j-1] + com[i-1][j];
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}
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}
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int n, m, dlen;
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__int64 d[MAXN];
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__int64 p1[MAXN], p2[MAXN];
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int main()
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{
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int i, j, k;
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get_Combination(MAXN);
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while (~scanf("%d %d", &n, &m))
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{
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memset(p1, 0, sizeof(p1));
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memset(p2, 0, sizeof(p2));
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for (i = 0; i < n; i++)
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{
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scanf("%d", &dlen);
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for (j = 0; j < dlen; j++) scanf("%I64d", &d[j]);
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if (i == 0)
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{
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for (j = 0; j < dlen; j++)
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{
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if (d[j] > m) continue;
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p1[d[j]] = com[m][d[j]];
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}
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continue;
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}
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for (j = m; j >= 0; j--)
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if (p1[j] != 0)
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{
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for (k = 0; k < dlen; k++)
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{
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if (j + d[k] > m) break;
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p2[j+d[k]] += com[m-j][d[k]] * p1[j];
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}
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p2[j] = p1[j];
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}
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for (j = 0; j <= m; j++)
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{
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p1[j] = p2[j];
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p2[j] = 0;
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}
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}
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printf("%I64d\n", p1[m]);
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}
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return 0;
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}
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