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F - Fabricating Sculptures
https://codeforces.com/gym/102428/submission/177271004
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Gym/102428/F/F.cpp
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36
Gym/102428/F/F.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 = 5e3 + 5;
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const int mod = 1e9 + 7;
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int m, n, f[N][N], s[N];
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> m >> n;
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for (int i = m; i <= n; i++) {
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f[1][i] = 1;
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s[i] = 1;
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}
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for (int i = 2; i <= m; i++) {
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f[i][m] = 1;
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s[i + m]++;
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for (int j = m + 1; j <= n; j++) {
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f[i][j] = (f[i - 1][j] + s[j]) % mod;
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s[i + j] = (s[i + j] + f[i][j]) % mod;
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}
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}
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cout << f[m][n] << endl;
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return 0;
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}
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