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28 lines
786 B
28 lines
786 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 1100;
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int f[N], v[N], w[N];
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// 视频讲解
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// https://www.bilibili.com/video/BV1u7411t7E5
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/**
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需要理解的是，二维降为一维，为什么要用倒序
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*/
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int main() {
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//输入+输出重定向
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freopen("../1299.txt", "r", stdin);
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int n, m;
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cin >> m >> n;
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for (int i = 1; i <= n; i++) cin >> v[i] >> w[i];
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for (int i = 1; i <= n; i++) {
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for (int j = m; j >= v[i]; j--) { //如果继续正序，会先算小的，与原来的概念就不一样了，只有从后向前算，依赖的才没有改变
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if (v[i] <= j) f[j] = max(f[j], f[j - v[i]] + w[i]);
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}
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}
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cout << f[m] << endl;
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//关闭文件
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fclose(stdin);
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return 0;
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} |