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//究极读入挂
inline char nc(){
static char buf[100000],*p1=buf,*p2=buf;
return p1==p2&&(p2=(p1=buf)+fread(buf,1,100000,stdin),p1==p2)?EOF:*p1++;
}
inline int read(){
char ch=nc();int sum=0;
while(!(ch>='0'&&ch<='9'))ch=nc();
while(ch>='0'&&ch<='9')sum=sum*10+ch-48,ch=nc();
return sum;
}

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