(NzADA^I HIMI^ESKIH OLIMPIAD (B((NPRINCIPY I ALGORITMY RE[ENIJ(B)s - (NsOROKIN(B,(Nw(B. (Nw(B.s (NwLADIMIR wALENTINOWI^s; (NzAGORSKIJ(B,(Nw(B. (Nw(B.s (NwQ^ESLAW wIKTOROWI^s; (NsWITANXKO(B,(Ni(B. (Nw(B.s (NiGORX wALENTINOWI^s ((Nm(B.s (NiZD(B-(NWO mgus, 1989)