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LibreOJ/2361/2361.cpp
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43
LibreOJ/2361/2361.cpp
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#include <iostream>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 2005;
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int t, k, n, m, c[N][N], f[N][N];
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int main() {
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cin >> t >> k;
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c[1][1] = 1;
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for (int i = 1; i <= 2000; i++) {
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c[i][0] = c[i][i] = 1;
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}
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for (int i = 2; i <= 2000; i++) {
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for (int j = 1; j < i; j++) {
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c[i][j] = (c[i - 1][j] + c[i - 1][j - 1]) % k;
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}
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}
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for (int i = 1; i <= 2000; i++) {
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for (int j = 1; j <= i; j++) {
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f[i][j] = f[i][j - 1] + f[i - 1][j] - f[i - 1][j - 1];
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if (!c[i][j]) f[i][j]++;
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}
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f[i][i + 1] = f[i][i];
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}
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while (t--) {
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cin >> n >> m;
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std::cerr << n << m << endl;
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cout << f[n][std::min(n, m)] << endl;
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}
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return 0;
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}
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