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- #include <unistd.h>
- template <class T> using V = vector<T>;
- template <class T> using VV = V<V<T>>;
- struct Scanner {
- int fd = -1;
- char line[(1 << 15) + 1];
- size_t st = 0, ed = 0;
- void reread() {
- memmove(line, line + st, ed - st);
- ed -= st;
- st = 0;
- ed += ::read(fd, line + ed, (1 << 15) - ed);
- line[ed] = '\0';
- }
- bool succ() {
- while (true) {
- if (st == ed) {
- reread();
- if (st == ed) return false;
- }
- while (st != ed && isspace(line[st])) st++;
- if (st != ed) break;
- }
- if (ed - st <= 50) {
- bool sep = false;
- for (size_t i = st; i < ed; i++) {
- if (isspace(line[i])) {
- sep = true;
- break;
- }
- }
- if (!sep) reread();
- }
- return true;
- }
- template <class T, enable_if_t<is_same<T, string>::value, int> = 0>
- bool read_single(T& ref) {
- if (!succ()) return false;
- while (true) {
- size_t sz = 0;
- while (st + sz < ed && !isspace(line[st + sz])) sz++;
- ref.append(line + st, sz);
- st += sz;
- if (!sz || st != ed) break;
- reread();
- }
- return true;
- }
- template <class T, enable_if_t<is_integral<T>::value, int> = 0>
- bool read_single(T& ref) {
- if (!succ()) return false;
- bool neg = false;
- if (line[st] == '-') {
- neg = true;
- st++;
- }
- ref = T(0);
- while (isdigit(line[st])) {
- ref = 10 * ref + (line[st++] & 0xf);
- }
- if (neg) ref = -ref;
- return true;
- }
- template <class T> bool read_single(V<T>& ref) {
- for (auto& d : ref) {
- if (!read_single(d)) return false;
- }
- return true;
- }
- template <class T> bool read_single(array<T,2>& ref) {
- if (!read_single(ref[0])) return false;
- if (!read_single(ref[1])) return false;
- return true;
- }
- template <class T> bool read_single(array<T,3>& ref) {
- if (!read_single(ref[0])) return false;
- if (!read_single(ref[1])) return false;
- if (!read_single(ref[2])) return false;
- return true;
- }
- template <class T> bool read_single(array<T,4>& ref) {
- if (!read_single(ref[0])) return false;
- if (!read_single(ref[1])) return false;
- if (!read_single(ref[2])) return false;
- if (!read_single(ref[3])) return false;
- return true;
- }
- void read() {}
- template <class H, class... T> void read(H& h, T&... t) {
- bool f = read_single(h);
- assert(f);
- read(t...);
- }
- Scanner(FILE* fp) : fd(fileno(fp)) {}
- };
- struct Printer {
- public:
- template <bool F = false> void write() {}
- template <bool F = false, class H, class... T>
- void write(const H& h, const T&... t) {
- if (F) write_single(' ');
- write_single(h);
- write<true>(t...);
- }
- template <class... T> void writeln(const T&... t) {
- write(t...);
- write_single('\n');
- }
- Printer(FILE* _fp) : fp(_fp) {}
- ~Printer() { flush(); }
- private:
- static constexpr size_t SIZE = 1 << 15;
- FILE* fp;
- char line[SIZE], small[50];
- size_t pos = 0;
- void flush() {
- fwrite(line, 1, pos, fp);
- pos = 0;
- }
- void write_single(const char& val) {
- if (pos == SIZE) flush();
- line[pos++] = val;
- }
- template <class T, enable_if_t<is_integral<T>::value, int> = 0>
- void write_single(T val) {
- if (pos > (1 << 15) - 50) flush();
- if (val == 0) {
- write_single('0');
- return;
- }
- if (val < 0) {
- write_single('-');
- val = -val; // todo min
- }
- size_t len = 0;
- while (val) {
- small[len++] = char(0x30 | (val % 10));
- val /= 10;
- }
- for (size_t i = 0; i < len; i++) {
- line[pos + i] = small[len - 1 - i];
- }
- pos += len;
- }
- void write_single(const string& s) {
- for (char c : s) write_single(c);
- }
- void write_single(const char* s) {
- size_t len = strlen(s);
- for (size_t i = 0; i < len; i++) write_single(s[i]);
- }
- template <class T> void write_single(const V<T>& val) {
- auto n = val.size();
- for (size_t i = 0; i < n; i++) {
- if (i) write_single(' ');
- write_single(val[i]);
- }
- }
- };
- Scanner sc = Scanner(stdin);
- Printer pr = Printer(stdout);
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