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23 lines
453 B
23 lines
453 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 100010, mod = 5000011;
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int n, k;
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int f[N], s[N];
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int main() {
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cin >> n >> k;
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f[0] = s[0] = 1;
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for (int i = 1; i <= n; i++) {
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if (i - k - 1 > 0)
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f[i] = s[i - k - 1]; // 利用前缀和优化
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else
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f[i] = f[0];
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s[i] = (s[i - 1] + f[i]) % mod; // 维护前缀和
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}
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printf("%d\n", s[n]);
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return 0;
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} |