2005NOIP 采药简单DP

#include < stdio.h >
#include < string .h >

int  t, n;
int  time[ 101 ], v[ 101 ];
int  f[ 101 ][ 1001 ];


void  DP()
{
    int i, j;
    for(i=n-1;i>=0;i--)
        for(j=0;j<=t;j++)
        {
            if(j>=time[i])f[i][j] = f[i+1][j] > f[i+1][j-time[i]]+v[i] ? f[i+1][j] : f[i+1][j-time[i]]+v[i];
            else
                f[i][j]=f[i+1][j];
        }
}

int  main()
{
    while(scanf("%d%d",&t,&n)==2)
    {
        memset(f,0,sizeof(f));
        int i;
        for(i=0;i<n;i++)
            scanf("%d%d",&time[i],&v[i]);

        DP();
        printf("%d\n",f[0][t]);
    }

    return 0;
}