I like "高精"

#include <iostream>
#include <string>
#include <vector>
using namespace std;
vector<int> stringToVector(const string& num) 
{
vector<int>digits(num.length());
for (int i=0;i<num.length();++i)
{
digits[num.length()-i-1]=num[i]-'0';
}
return digits;
}
string highPrecisionAddition(const string& num1, const string& num2) 
{
vector<int>digits1=stringToVector(num1);
vector<int>digits2=stringToVector(num2);
int maxLength=max(digits1.size(),digits2.size());
vector<int> result(maxLength+1,0);
for (int i=0; i<maxLength;++i) 
{
if (i<digits1.size()) result[i]+=digits1[i];
if (i<digits2.size()) result[i]+=digits2[i];
if (result[i] >=10) 
{
result[i+1]+=result[i]/10;
result[i]%=10;
}
}
string sum;
bool leadingZero = true;
for (int i=result.size()-1;i>=0;--i)
{
if (result[i]==0&&leadingZero&&i!=0) continue;
leadingZero=false;
sum+=result[i]+'0';
}
return sum;
}
int main() 
{
string num1, num2;
cin>>num1>>num2;
cout<<highPrecisionAddition(num1, num2)<<endl;
return 0;
}