2389.cpp

这些是我到目前在PKU上做出的题目

#include <iostream.h>
#include <string.h>

int main()
{
	char a[51];
	int n1[51],n2[51],res[101],m1,m2,mm,i,j;
	cin>>a;
	mm=strlen(a)-1;
	m1=51;
	for (i=mm;i>=0;i--)
	{
		m1--;
		n1[m1]=a[i]-'0';
	}
	cin>>a;
	mm=strlen(a)-1;
	m2=51;
	for (i=mm;i>=0;i--)
	{
		m2--;
		n2[m2]=a[i]-'0';
	}
	for (i=0;i<=100;i++)
		res[i]=0;
	for (i=50;i>=m2;i--)
		for (j=50;j>=m1;j--)
			res[i+j]=res[i+j]+n1[j]*n2[i];
	mm=m1+m2;
	
	for (i=100;i>mm;i--)
	{
		res[i-1]=res[i-1]+res[i]/10;
		res[i]=res[i]%10;
	}
	while (res[mm]>=10)
	{
		res[mm-1]=res[mm]/10;
		res[mm]=res[mm]%10;
		mm--;
	}
	for (i=mm;i<=100;i++)
		cout<<res[i];
	cout<<"\n";
	return 0;
}