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| #include <bits/stdc++.h>
using namespace std;
string bigAdd(string a,string b){
int cr[4001];
string res = "";
while(a.size()>b.size())
b = '0' + b;
while(b.size()>a.size())
a = '0' + a;
for(int i = 0;i<4001;i++)
cr[i] = 0;
for(int i = a.size()-1;i>=0;i--){
cr[i] += (a[i]-'0')+(b[i]-'0');
if(i > 0){
cr[i-1] += cr[i]/10;
cr[i] = cr[i]%10;
}
}
int f = 0;
for(int i = 0;i<a.size();i++){
if(f == 0 && cr[i] != 0)f = 1;
if(f == 1){
if(i == 0 && cr[i] >= 10){
res += cr[i] / 10 + '0';
cr[i] = cr[i] % 10;
}
res += cr[i] + '0';
}
}
if(f == 0)return "0";
return res;
}
string smallMulti(string a,int b){
int cr[4001];
string res = "";
for(int i = 0;i<4001;i++)
cr[i] = 0;
for(int i = a.size()-1;i>=0;i--){
cr[i] += (a[i]-'0')*b;
if(i > 0){
cr[i-1] += cr[i]/10;
cr[i] = cr[i]%10;
}
}
int f = 0;
for(int i = 0;i<a.size();i++){
if(f == 0 && cr[i] != 0)f = 1;
if(f == 1){
if(i == 0 && cr[i] >= 10){
res += cr[i] / 10 + '0';
cr[i] = cr[i] % 10;
}
res += cr[i] + '0';
}
}
if(f == 0)return "0";
return res;
}
int main(){
string a,b,res = "0";
cin >> a >> b;
for(int i = 0;i<b.size();i++){
string c = smallMulti(a,b[i]-'0');
for(int j = 0;j<b.size()-1-i;j++)
c += '0';
res = bigAdd(res,c);
}
cout << res;
return 0;
}
|