杭电ACM 1002大数相加

#include<iostream>
#include<string>
#include<vector>
using namespace std;

string add(string a, string b)
{
	string max, min;
	max = a;
	min = b;
	if( a.length() < b.length() )
	{
		max = b;
		min = a;
	}

	int lmax = max.length();
	int lmin = min.length();
	for(int i=lmax-1,j=lmin-1; j>=0; --i, --j)
	{
		max[i]+=min[j] - '0';
	}

	for(int i=lmax-1; i>=1 ;--i)
	{
		if( max[i]>'9' )
		{
			max[i] = max[i] - 10;
			max[i-1]+=1;
		}
	}
	if(max[0] > '9')
	{
		max[0]-=10;
		max = '1' +max;
	}
	return max;
}

int main()
{
	string a,b;
	string aa[20];
	string bb[20];
	int T;
	cin>>T;
	vector<string> svec;

	for(int i=0; i<T; i++)
	{
		cin>>a>>b;
		aa[i] =a ;
		bb[i] = b;
		svec.push_back( add(a,b) );
	}
	cout<<endl;
	for(int i=1; i<=T; ++i)
	{
		cout<<"case "<<i<<":"<<endl;
		cout<<aa[i-1]<<" + "<<bb[i-1]<<" = "<<svec[i-1]<<endl<<endl;

	}
	return 0;
}