AcWing 793. 高精度乘法
原题链接
简单
作者:
我是java同学
,
2022-12-01 11:11:22
,
所有人可见
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阅读 123
#include <iostream>
#include <vector>
using namespace std;
vector<int> mul(vector<int> &A, int b)
{
vector<int> C;
int t = 0;
for (int i = 0; i <= A.size() || t; i ++)
{
if (i < A.size()) t += A[i] * b;
C.push_back(t % 10);
t /= 10;
}
while (C.size() > 1 && C.back() == 0) C.pop_back();
return C;
}
int main()
{
string a;
int b;
vector<int> A;
cin >> a >> b;
for (int i = a.size() - 1; i >= 0; i --) A.push_back(a[i] - '0');
vector<int> C = mul(A, b);
for (int i = C.size() - 1; i >= 0; i --) cout << C[i];
cout << endl;
return 0;
}