代码

#include <bits/stdc++.h>
// fast_io
using i64 = int64_t;
using u32 = uint32_t;
using u64 = uint64_t;
int main() {
#ifdef LOCAL
    auto flush = [&]() {};
    auto ii = [&]() {
        int x;
        std::cin >> x;
        return x;
    };
    auto oo = [&](auto x, char c = 10) {
        std::cout << x << c << std::flush;
    };
#else
    char bufI[1 << 19], *ptrI = bufI, *endI = bufI + sizeof(bufI);
    char bufO[1 << 19], *ptrO = bufO, *endO = bufO + sizeof(bufO);
    fread(bufI, 1, sizeof(bufI), stdin);
    auto load = [&]() {
        memcpy(bufI, ptrI, endI - ptrI);
        fread(endI - ptrI + bufI, 1, ptrI - bufI, stdin);
        ptrI = bufI;
    };
    auto flush = [&]() {
        fwrite(bufO, 1, ptrO - bufO, stdout);
        ptrO = bufO;
    };
    auto ii = [&]() {
        if (endI - ptrI < 32) load();
        int x{};
        int n{};
        for (; *ptrI < 48; ++ptrI) n = *ptrI == 45;
        for (; *ptrI > 47; ++ptrI) x = x * 10 + *ptrI - 48;
        return n ? -x : +x;
    };
    auto oo = [&](auto x, char c = 10) {
        if (endO - ptrO < 32) flush();
        if (x < 0) x = -x, *ptrO++ = '-';
        static char buf[21];
        char *end = buf + 21;
        char *ptr = buf + 21;
        *--ptr = c;
        for (; x >= 10; x /= 10)
            *--ptr = char(48 + x % 10);
        *--ptr = char(48 + x);
        memcpy(ptrO, ptr, end - ptr);
        ptrO += end - ptr;
    };
#endif
    for (auto i = ii(); i > 0; --i) oo(ii() + ii());
    flush();
}

评测结果