_ S sc(S s,I c){W(*s-c)P(!*s++,0)R s;}_ I scn(S s,I c,I n){…

_ S sc(S s,I c){W(*s-c)P(!*s++,0)R s;}_ I scn(S s,I c,I n){N(n,P(c==s[i],i))R n;}//_ K P1(J x){R(K)(X1<<48|x);}_ K P2(J x){R(K)(X2<<48|x);}_ K P3(J x){R(K)(X3<<48|x);}