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 1 struct FastIO {
 2     static const int S = 1310720;
 3     int wpos;
 4     char wbuf[S];
 5     FastIO() : wpos(0) { }
 6     inline int xchar() {
 7         static char buf[S];
 8         static int len = 0, pos = 0;
 9         if (pos == len) pos = 0, len = fread(buf, 1, S, stdin);
10         if (pos == len) return -1;
11         return buf[pos++];
12     }
13     inline int xint() {
14         int c = xchar(), x = 0, s = 1;
15         while (c <= 32) c = xchar();
16         if (c == '-') s = -1, c = xchar();
17         for (; '0' <= c && c <= '9'; c = xchar()) x = x * 10 + c - '0';
18         return x * s;
19     }
20     ~FastIO() {
21         if (wpos) fwrite(wbuf, 1, wpos, stdout), wpos = 0;
22     }
23 } io;

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