超极快读快写
#include <bits/stdc++.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdint.h>
#include <ctype.h>
#include <cstring>
using namespace std;
constexpr size_t MSIZE = 1 << 25;
constexpr size_t PRE_DATA_SIZE = 0x10000;
const int PROT = PROT_READ;
const int FLAGS = MAP_PRIVATE;
char* c = nullptr;
uint64_t pre_data[PRE_DATA_SIZE];
using u32 = uint64_t;
inline void init_pre_data() {fill_n(pre_data, PRE_DATA_SIZE, UINT32_MAX);for (size_t i = 0; i < 10; ++i) {for (size_t j = 0; j < 10; ++j) {uint16_t key = (('0' + j) << 8) | ('0' + i);pre_data[key] = i + j * 10;}}
}inline u32 readu() {while (*c <= ' ') ++c;u32 x = 0;while (true) {uint16_t key;memcpy(&key, c, sizeof(key));if (pre_data[key] != UINT32_MAX) {x = x * 100 + pre_data[key];c += 2; } else {break;}}if (isdigit(static_cast<unsigned char>(*c))) {x = x * 10 + (*c - '0');++c;}return x;
}inline void write_str(const char* s) {while (*s != '\0') {putchar_unlocked(*s);++s;}
}inline void write_u32(u32 x) {static char buf[12]; char* ptr = buf + 11;*ptr = '\0'; if (x == 0) {*(--ptr) = '0'; } else {while (x > 0) {*(--ptr) = (x % 10) + '0';x /= 10;}}write_str(ptr);putchar_unlocked('\n');
}
inline void cleanup() {if (c != MAP_FAILED && c != nullptr) {munmap(c, MSIZE);}
}int main() {int fd = open("/dev/stdin", O_RDONLY);if (fd == -1) {perror("open stdin failed");exit(EXIT_FAILURE);}c = static_cast<char*>(mmap( nullptr, MSIZE, PROT,FLAGS, fd, 0));close(fd); if (c == MAP_FAILED) {perror("mmap failed");exit(EXIT_FAILURE);}atexit(cleanup);init_pre_data();u32 k = readu();while (k >= 4) {write_u32(readu() ^ readu());write_u32(readu() ^ readu());write_u32(readu() ^ readu());write_u32(readu() ^ readu());k -= 4;}while (k-- > 0) {write_u32(readu() ^ readu());}return 0;
}
