快读模板
inline long long read()
{
long long x=0,k=1;
char c=getchar();
while (c<'0' || c>'9') {if (c=='-') k=-1;c=getchar();}
while (c>='0' && c<='9') {x=x*10+c-48;c=getchar();}
return x*k;
}
{
long long x=0,k=1;
char c=getchar();
while (c<'0' || c>'9') {if (c=='-') k=-1;c=getchar();}
while (c>='0' && c<='9') {x=x*10+c-48;c=getchar();}
return x*k;
}
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