AcWing 791. 高精度加法

#include<bits/stdc++.h>
using namespace std;
vector<int> add(vector<int> &A, vector<int> &B) {
    vector<int> C;
    int t = 0;
    for (int i = 0; i < A.size()||i < B.size(); i ++ ) {
        if(i<A.size()) t+=A[i];
        if(i<B.size()) t+=B[i];
        C.push_back(t % 10);
        t /= 10;
    }
    if (t) C.push_back(1);
    return C;
}
int main() {
    string a,b;
    vector<int>A,B;
    cin>>a>>b;//a=123456
    for(int i=a.size()-1; i>=0; i--)  A.push_back(a[i]-‘0‘);
    for(int i=b.size()-1; i>=0; i--)  B.push_back(b[i]-‘0‘);
    auto C=add(A,B);
    for(int i=C.size()-1; i>=0; i--) printf("%d",C[i]);
    return 0;
}