题解 | #称砝码#

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int n;
    int cnt = 1;
    scanf("%d", &n);
    int *weight = (int *)malloc(sizeof(int) * n);
    int *num = (int *)malloc(sizeof(int) * n);
    for(int i=0; i<n; i++)
    {
        scanf("%d ", weight+i);
    }
    for(int i=0; i<n; i++)
    {
        scanf("%d ", num+i);
        cnt += weight[i] * num[i];
    }
    int *sum = (int *)malloc(sizeof(int) * cnt);
    sum[0] = 1;
    for(int i=0; i<n; i++)
    {
        for(int j=0; j<num[i]; j++)
        {
            for(int k=cnt-1; k>=0; k--)
            {
                if(sum[k])
                    sum[k + weight[i]] = 1;
            }
        }
    }
    int count = 0;
    for(int i=0; i<cnt; i++)
    {
        if(sum[i])
            count++;
    }
    printf("%d\n", count);
    free(weight);
    weight = NULL;
    free(num);
    num = NULL;
    free(sum);
    sum = NULL;
    return 0;
}