inline int read(){ int x=0,f=1;char ch=getchar(); while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();} while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();} return x*f; } //f->signal x->number
經過getchar來取代cin不斷對緩衝區的操做,加快速度code
調用n=read()便可ci
n=read()