考试订错3---2

#include<cstdio> #include<iostream> using namespace std; #define inf 1000000007 #define N 10000010 char xB[1<<15],*xS=xB,*xTT=xB; #define getc() (xS==xTT&&(xTT=(xS=xB)+fread(xB,1,1<<15,stdin),xS==xTT)

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