#source code in python: datalist=[] n=int(input("Enter number of elements: ")) for i in range(n): data=int(input("Enter number ")) datalist.append(data) start=0 end=0 check=0 for i in range(len(datalist)): if(check==0 and datalist[i]==12): check=1 start=i+1 end=i+1 elif(datalist[i]==12 and check==1): end=i+1 if(start!=0): #here based on the program index start from 1 print("First occurance index:",start) print("Last occurance index:", end) else: print("index:",0)
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