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Re:怎么会WA,谢谢In Reply To:直接使用(a/p)=a^(p-1)/2即可 Posted by:mathzqy at 2004-08-27 10:17:56 #include <stdio.h> int a,p; __int64 mod2(int k) { int i; __int64 m; m = a%p; for(i=0;i<k;i++) m = (m*m)%p; return m; } int done() { int k,q=p/2; __int64 m(1); for(k=0;k<32;k++) if(((1<<k)&q)>0) m = m*mod2(k)%p; if(m==1) return 1; else return -1; } void main() { int t,tt; scanf("%d",&tt); for(t=1;t<=tt;t++) { scanf("%d%d",&a,&p); printf("Scenario #%d:\n%d\n\n",t,done()); } } Followed by:
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