The question ： Yes n Kind of food , Every kind of food can bring Qiuqiu a sense of happiness a, And it will bring her b A lot of calories , And then make sure she doesn't eat more calories a day than m, Altogether n Kind of food , Ask what you can get

What is the greatest happiness ？

Problem solving report ： At first I thought it was 01 knapsack , I didn't look at the question , Then I found that the title didn't say that every kind of food can only be eaten once , It's a complete backpack , At first I thought the second set of test data was wrong , speechless ...

``` #include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;

int a[],b[],ans[];

int main()
{
int n,m;
while(scanf("%d",&n)!=EOF)
{
for(int i = ;i < n;++i)
scanf("%d%d",&a[i],&b[i]);
scanf("%d",&m);
memset(ans,,sizeof(ans));
for(int i = ;i < n;++i)
for(int k = ;k <= m / b[i];++k)
for(int j = m;j >= k * b[i];--j)
ans[j] = max(ans[j],ans[j-k * b[i]] + k * a[i]);
int Mtot = ans[];
for(int i = ;i <= m;++i)
Mtot = max(ans[i],Mtot);
printf("%d\n",Mtot);
}
return ;
}```

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