P1048 采药

Posted 2020-12-18 jackwang-sparrow

 

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define mem(a) memset(a,0,sizeof(a))
#define sc1(a) scanf("%lld",&a)
#define sc2(a,b) scanf("%lld%lld",&a,&b)
#define sc3(a,b,c) scanf("%lld%lld%lld",&a,&b,&c)
const ll MAXN=1e9+7;
const ll N=1e5+5;
ll dp[N];
int main()
{
    ll T,M,i,j;
    sc2(T,M);
    ll t[M],m[M];
    for(i=0;i<M;i++)
    {
        sc2(t[i],m[i]);
    }
    mem(dp);
    for(i=0;i<M;i++)
    {
        for(j=T;j>=t[i];j--)
        {
            dp[j]=max(dp[j],dp[j-t[i]]+m[i]);
        }
    }
    cout<<dp[T]<<endl;
}