read

Posted 2020-09-21 YXY_1211

 1 int read()
 2 {
 3     int t=0,f=1;
 4     char ch=getchar();
 5     while(ch<‘0‘ || ch>‘9‘)
 6     {
 7         if(ch==‘-‘) {f=-1;ch=getchar();}
 8     }
 9     while(ch>=‘0‘ && ch<=‘9‘) {t=t*10+ch-‘0‘;ch=getchar();}
10     return t*f;
11 }

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