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小技巧从900+MS到500+MS。。不用cin也不用scanf...用这段。。
inline void scan(long int &x)
{
while(c=getchar(), c<'0'||c>'9');
x=c-'0';
while(c=getchar(), c>='0'&&c<='9') x=x*10+c-'0';
}
快非常多。
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