BabbleDay's Blog
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BabbleDay
posted @ 2013年4月17日 13:43
in 刷题防身
, 809 阅读
难得的一次过啊。。。经典的01背包问题，那句注释是重点
#include <iostream>
#include <cstring>
#define max(a, b) ( a > b ? a: b)
using namespace std;
//store the max price with weight no more than a[i]
int a[31];
void the_case()
{
memset(a, 0, sizeof(a));
int num, p, w, maxw;
cin >> num;
while(num--)
{
cin >> p >> w;
for (int i=30; i>=w; i--)//注意是倒序，从没更新的数据实现更新
{
a[i] = max(a[i-w]+p, a[i]);
}
}
cin >> num;
int ans=0;
while(num--)
{
cin >> maxw;
ans += a[maxw];
}
cout << ans << endl;
}
int main()
{
int c;
cin >> c;
while(c--)
{
the_case();
}
}
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