把 a[p] \oplus a[p+1] \oplus ... \oplus a[N] \oplus x 换为 a[p] \oplus a[p+1] \oplus \cdots \oplus a[N] \oplus x
a[p] \oplus a[p+1] \oplus ... \oplus a[N] \oplus x
a[p] \oplus a[p+1] \oplus \cdots \oplus a[N] \oplus x
效果:
原来:a[p]⊕a[p+1]⊕...⊕a[N]⊕xa[p] \oplus a[p+1] \oplus ... \oplus a[N] \oplus xa[p]⊕a[p+1]⊕...⊕a[N]⊕x
现在:a[p]⊕a[p+1]⊕⋯⊕a[N]⊕xa[p] \oplus a[p+1] \oplus \cdots \oplus a[N] \oplus xa[p]⊕a[p+1]⊕⋯⊕a[N]⊕x