ในโปรแกรม C++ นี้ เราใช้แนวทาง Divide and Conquer โดยใช้ตัวเลขฟีโบนักชี โดยใช้ตัวเลขฟีโบนักชี เราคำนวณช่วงกลางของอาร์เรย์ข้อมูลเพื่อค้นหารายการข้อมูล ความซับซ้อนของเวลาของวิธีการนี้คือ O(log(n))
อัลกอริทึม
Begin Assign the data to the array in a sorted manner. Take input of the element to be searched. Call FibonacciSearch() function. Calculate the mid value using ‘start+fib[index-2]’ expression. If the chosen item is equal to the value at mid index, print result and return to main. If it is lesser than the value at mid index, proceed with the left sub-array. If it is more than the value at mid index, proceed with the right sub-array. If the calculated mid value is equal to either start or end then the item is not found in the array. End
โค้ดตัวอย่าง
#include<iostream> using namespace std; void FibonacciSearch(int *a, int start, int end, int *fib, int index, int item) { int i, mid; mid = start+fib[index-2]; if(item == a[mid]) { cout<<"\n item found at "<<mid<<" index."; return; } else if(item == a[start]) { cout<<"\n item found at "<<start<<" index."; return; } else if(item == a[end]) { cout<<"\n item found at "<<end<<" index."; return; } else if(mid == start || mid == end) { cout<<"\nElement not found"; return; } else if(item > a[mid]) FibonacciSearch(a, mid, end, fib, index-1, item); else FibonacciSearch(a, start, mid, fib, index-2, item); } main() { int n, i, fib[20], a[10]={3, 7, 55, 86, 7, 15, 26, 30, 46, 95}; char ch; fib[0] = 0; fib[1] = 1; i = 1; while(fib[i] < 10) { i++; fib[i] = fib[i-1] + fib[i-2]; } up: cout<<"\nEnter the Element to be searched: "; cin>>n; FibonacciSearch(a, 0, 9, fib, i, n); cout<<"\n\n\tDo you want to search more...enter choice(y/n)?"; cin>>ch; if(ch == 'y' || ch == 'Y') goto up; return 0; } }
ผลลัพธ์
Enter the Element to be searched: 26 item found at 6 index. Do you want to search more...enter choice(y/n)?y Enter the Element to be searched: 45 item not found Do you want to search more...enter choice(y/n)?n