Function readn

code/tricks/fast_input.cpp:1–12

void readn(register int *n) {
  int sign = 1;
  register char c;
  *n = 0;
  while((c = getc_unlocked(stdin)) != '\n') {
    switch(c) {
      case '-': sign = -1; break;
      case ' ': goto hell;
      case '\n': goto hell;
      default: *n *= 10; *n += c - '0'; break; } }
hell:
  *n *= sign; }
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