18 lines
414 B
C++
18 lines
414 B
C++
#include <bits/stdc++.h>
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using namespace std;
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const int N = 1010;
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const int MOD = 1e9 + 7;
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int f[N];
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int n;
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int main() {
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cin >> n;
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f[0] = 1; // 容量为0时，前 i 个物品全不选也是一种方案
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for (int i = 1; i <= n; i++)
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for (int j = i; j <= n; j++) // 完全背包从小到大
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f[j] = (f[j] + f[j - i]) % MOD;
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cout << f[n] << endl;
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return 0;
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} |