[AcWing 793] 高精度乘法
作者:互联网
点击查看代码
#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;
cin >> a >> b;
vector<int> A;
for (int i = a.size() - 1; i >= 0; i --) A.push_back(a[i] - '0');
auto C = mul(A, b);
for (int i = C.size() - 1; i >= 0; i --) printf("%d", C[i]);
return 0;
}
- i < A.size( ) | | t 设置的很巧妙;
- 123 × 0 用模板计算后会是 000,所以记得去掉前导的 0;
标签:include,793,int,back,AcWing,vector,mul,size,乘法 来源: https://www.cnblogs.com/wKingYu/p/16192123.html