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37 lines
731 B
37 lines
731 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 1e6 + 10;
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int a[N];
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void mul(int a[], int b, int &len) {
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int t = 0;
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for (int i = 1; i <= len; i++) {
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t += a[i] * b;
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a[i] = t % 10;
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t /= 10;
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}
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while (t) {
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a[++len] = t % 10;
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t /= 10;
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}
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//去前导0
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while (len > 1 && !a[len]) len--;
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}
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int main() {
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int T;
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cin >> T;
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while (T--) {
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int n, x;
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scanf("%d %d", &n, &x);
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int al = 0, cnt = 0;
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a[++al] = 1;
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for (int i = 2; i <= n; i++) mul(a, i, al);
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for (int i = 1; i <= al; i++)
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if (a[i] == x) cnt++;
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printf("%d\n", cnt);
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}
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return 0;
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} |