Код: Выделить всё
#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <time.h>
using namespace std;
void mul(vector <int> & a, vector <int> b)
{
int k = 0;
int a0 = 0, a1 = 0, b0 = 0, b1 = 0;
if (a.size() > b.size()) swap(a,b);
if (a.size() / 2 < 10)
{
a0 = 0;
int st = 1;
for (int i = 0; i < a.size()/2; i++)
{
a0 += a[i]*st;
st *= 10;
}
a1 = 0;
int k = a.size()/2;
st = 1;
for (int i = a.size()/2; i < a.size(); i++)
{
a1 += a[i] * st;
st *= 10;
}
cout << endl;
}
if (b.size() / 2 < 10)
{
b0 = 0;
int st = 1;
k = a.size()/2;
for (int i = 0; i < b.size() - (a.size() - k); i++)
{
b0 += b[i] * st;
st *= 10;
}
b1 = 0;
st = 1;
for (int i = b.size() - (a.size() - k); i < b.size(); i++)
{
b1 += b[i] * st;
st *= 10;
}
}
int c0 = a0 * b0;
int c1 = a1 * b1;
int c2 = c0 + c1 - (a0 - a1)*(b0 - b1);
int m = 1;
for (int i = 0; i < k; i++)
{
m *= 10;
}
int m1 = m;
for (int i = 0; i < k; i++)
{
m1 *= 10;
}
cout << c0 + c2 * m + c1*m1;
}
int main()
{
double time = clock();
string s;
getline(cin,s);
vector <int> a;
for (int i = s.length() - 1; i >= 0; i--)
{
a.push_back(s[i] - '0');
}
getline(cin,s);
vector <int> b;
for (int i = s.length() - 1; i >= 0; i--)
{
b.push_back(s[i] - '0');
}
mul(a,b);
time = (clock()-time)/CLOCKS_PER_SEC;
cout << "Time: " << time << "\n";
system("pause");
return 0;
}
