AcWing 793. 高精度乘法

#include <bits/stdc++.h>using namespace std;vector<int> mul(vector<int> &A,int b){ int t=0; vector<int> C; 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,C; for(int i=a.size()-1;i>=0;i--) A.push_back(a[i]-‘0‘); C=mul(A,b); for(int i=C.size()-1;i>=0;i--) printf("%d",C[i]); return 0;}