30 lines
502 B
C++
30 lines
502 B
C++
#include<bits/stdc++.h>
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using namespace std;
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/*
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知识点内容：和为sum的方法数
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文档内容参考：
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https://www.cnblogs.com/aiguona/p/9218754.html
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*/
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int main() {
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int n, sum;
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cin >> n >> sum;
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vector<long long> a(sum + 1);
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vector<int> b(n);
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for (int i = 0; i < n; i++)
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cin >> b[i];
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a[0] = 1;
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for (int i = 0; i < n; i++)
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for (int j = sum; j >= b[i]; j--)
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a[j] += a[j - b[i]];
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cout << a[sum] << endl;
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return 0;
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} |