采药--01背包

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luogu 1048

Code:

#include <bits/stdc++.h>
using namespace std;
#define maxm 110
#define maxt 1010
int T,m,c[maxm],w[maxm],f[maxt];

inline void init_() {
	freopen("a.txt","r",stdin);
}

inline int read_() {
	int x=0,f=1;
	char c=getchar();
	while(c<'0'||c>'9') {
		if(c=='-') f=-1;
		c=getchar();
	}
	while(c>='0'&&c<='9') {
		x=x*10+c-'0';
		c=getchar();
	}
	return x*f;
}

inline void readda_() {
	T=read_();m=read_();
	for(int i=1;i<=m;i++) {
		c[i]=read_();w[i]=read_();
	}
}

inline void clean_() {
	memset(f,0,sizeof(f));
}

inline void work_() {
	clean_();
	for(int i=1;i<=m;i++) {
		for(int j=T;j>=c[i];j--) {
			f[j]=max(f[j],f[j-c[i]]+w[i]);
		}
	}
	printf("%d",f[T]);
}

int main() {
	init_();
	readda_();
	work_();
	return 0;
}