bool Push dualStack& DS,E x, int it if DS. t([0+1==DS. t[1) return false; if(i==0)Ds. t[0++; else Ds. t[]--; DS.VDS t[l=X return true, bool Pop( ualStack ds,e&x, int i if DS. t 1==DS biD return false X=DS.VDS. t[ll if(i==0)Ds. t[0]--; else Ds. t[1++; return true,bool Push(DualStack& DS, E x, int i) { if (DS.t[0]+1 == DS.t[1]) return false; if (i == 0) DS.t[0]++; else DS.t[1]--; DS.V[DS.t[i]] = x; return true; } bool Pop(DualStack& DS, E & x, int i) { if (DS.t[i] == DS.b[i]) return false; x = DS.V[DS.t[i]]; if (i == 0) DS.t[0]--; else DS.t[1]++; return true; } 13