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- inline int scan( ) {
- int n=0;
- int ch=getchar_unlocked();
- while( ch <48 )ch=getchar_unlocked();
- while( ch >47 )
- n = (n<<3)+(n<<1) + ch-'0', ch=getchar_unlocked();
- return n;
- }
- n = (n<<3)+(n<<1) + ch-'0', ch=getchar_unlocked();
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