C++ 代码

#include <iostream>
#include <cstdio>
#include <vector>
#include <string>

using namespace std;

int T;
vector<int> A, B;
string a, b;

vector<int> add(vector<int>& A, vector<int>& B)
{
    if (A.size() < B.size()) return add(B, A);

    vector<int> C;
    int t = 0;
    for (int i = 0; i < A.size(); i++)
    {
        t += A[i];
        if (i < B.size()) t += B[i];
        C.push_back(t % 10);
        t /= 10;
    }
    if (t) C.push_back(t);
    return C;
}

int main()
{
    cin >> T;
    for (int i = 1; i <= T; i++)
    {
        cin >> a >> b;
        printf("Case %d:\n", i);
        A.clear(), B.clear();
        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');
        vector<int> res = add(A, B);
        cout << a << " + " << b << " = ";
        for (int i = res.size() - 1; i >= 0; i--) cout << res[i];
        if (i != T) printf("\n\n");
        else printf("\n");
    }
    return 0;
}