为什么错

#include<cstdio>
#include<cstring>
using namespace std;
struct node
{
int a[51000],len;
node()
{
len=0;
memset(a,0,sizeof(a));
}
};
node chengfa(node x1,node x2)
{
node x0;int i,j;
x0.len=x1.len+x2.len-1;
for (i=1;i<=x1.len;i++)
for (j=1;j<=x2.len;j++)
{
x0.a[i+j-1]+=x1.a[i]*x2.a[j];
}
for (i=1;i<=x0.len;i++)
{
x0.a[i+1]+=x0.a[i]/10;
x0.a[i]%=10;
}
i=x0.len;
while (x0.a[i]>10)
{
x0.a[i+1]+=x0.a[i]/10;
x0.a[i]%=10;
i++;
}
x0.len=i;
return x0;
}
int a[51000],b[51000];
int main()
{
node x,x1,x2;

int k;
char s1[1100],s2[1100];
scanf("%s",s1+1);
k=strlen(s1+1);
for (int i=1;i<=k;i++)
x1.a[i]=s1[k-i+1]-'0';
x1.len=k;

scanf("%s",s2+1);
k=strlen(s2+1);
for (int i=1;i<=k;i++)
x2.a[i]=s2[k-i+1]-'0';
x2.len=k;

x=chengfa(x1,x2);
for (int i=x.len;i>=1;i--)
{
printf("%d",x.a[i]);
}
return 0;
}

1 条评论

  • @ 2015-08-13 10:26:07

    #include <cstdio>
    #include <cstring>
    using namespace std;
    struct Bigint
    {
    int n,a[20005];
    Bigint()
    {
    n = 0;
    memset(a,0,sizeof(a));
    }
    void operator = (const char string[10005])
    {
    n = strlen(string);
    for (int i = 0;i < n;i++)
    a[i] = string[n-1-i]-'0';
    }
    Bigint operator * (const Bigint &x)
    {
    Bigint t;t.n = n+x.n-1;
    for (int i = 0;i < n;i++)
    for (int j = 0;j < x.n;j++)
    t.a[i+j] += a[i]*x.a[j];
    for (int i = 0;i < t.n;i++)
    {
    t.a[i+1] += t.a[i] / 10;
    t.a[i] %= 10;
    }
    if (t.a[t.n]) t.n++;
    return t;
    }
    };
    int main()
    {
    char x[10005],y[10005];
    scanf("%s%s",x,y);
    Bigint a,b;
    a = x;
    b = y;
    Bigint ans;
    ans = a*b;
    for (int i = ans.n-1;i >= 0;i--)
    printf("%d",ans.a[i]);
    printf("\n");
    return 0;
    }

  • 1

信息

ID
1040
难度
7
分类
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标签
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递交数
16503
已通过
3154
通过率
19%
被复制
23
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