7-123 4006 A+B问题

#include <algorithm>
#include <cstdint>
#include <iostream>
#include <limits>
#include <numeric>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>

using i32 = std::int32_t;
using i64 = std::int64_t;
using u32 = std::uint32_t;
using u64 = std::uint64_t;
using pii = std::pair<i32, i32>;
using pll = std::pair<i64, i64>;
using vi = std::vector<i32>;
using vll = std::vector<i64>;
using vpii = std::vector<pii>;
using vpll = std::vector<pll>;

void solve();

int main()
{
    std::cin.tie(nullptr)->sync_with_stdio(false);
    solve();
}

i32 exstoi(const std::string &str)
{
    std::string temp;
    for (auto &item : str)
    {
        if (std::isdigit(item) || item == '-')
        {
            temp += item;
        }
    }
    return std::stoi(temp);
}

void solve()
{
    bool endl = false;
    std::string a, b;
    while (std::cin >> a >> b)
    {
        if (endl)
        {
            std::cout << '\n';
        }
        auto new_a = exstoi(a), new_b = exstoi(b);
        std::cout << new_a + new_b;
        endl = true;
    }
}