delete pics to save space

history_source/信息学奥赛一本通/2.1.7.cpp

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+#include<cstdio>
+#include<cstring>
+#define maxn 405
+struct node
+{
+	int len,num[maxn];
+	node()
+	{
+		len=1;
+		memset(num,0,sizeof(num));
+		num[1]=0;
+	}
+};
+void print(node &p)
+{
+	static int i;
+	for(i=p.len;i>0;i--) printf("%d",p.num[i]);
+	printf("\n");
+}
+void times(node &a,node &b,node &c)
+{
+	c.len=a.len+b.len-1;
+	static int i,j;
+	memset(c.num,0,sizeof(c.num));
+	for(i=1;i<=a.len;i++)
+		for(j=1;j<=b.len;j++)
+			c.num[i+j-1]+=a.num[i]*b.num[j];
+	for(i=1;i<=c.len;i++) c.num[i+1]+=c.num[i]/10,c.num[i]%=10;
+	if(c.num[c.len+1]>0) c.len++;
+}
+void input(node &a)
+{
+	static char str[maxn];
+	static int i;
+	scanf("%s",str);
+	a.len=strlen(str);
+	for(i=1;i<=a.len;i++) a.num[i]=str[a.len-i]-'0';
+}
+int main()
+{
+	node a,b,c;
+	input(a);
+	input(b);
+	times(a,b,c);
+	print(c);
+	return 0;
+}