इस कार्यक्रम में हमें एक सरणी में खोज अनुक्रम के अस्तित्व को खोजने के लिए द्विआधारी खोज को लागू करने की आवश्यकता है। द्विआधारी खोज की समय जटिलता O(log(n)) है।
आवश्यक चरण और छद्म कोड
Begin BinarySearch() function has ‘arr’ the array of data and ‘n’ the number of values, start and end index, iteration count and b[0] be the element to be searched in the argument list. Increment the iteration counter and compare the item value with the a[mid]. If item < a[mid] choose first half otherwise second half to proceed further. Return index value to main. In main(), sequentially compare the remaining items of search sequence to next items in the array. Print the index range of the sequence found. End.
उदाहरण कोड
#include<iostream> using namespace std; int BinarySearch(int a[], int start, int end, int item, int iter) { int i, mid; iter++; mid = start+ (end-start+1)/2; if(item > a[end] || item < a[start] || mid == end) { cout<<"\nNot found"; return -1; } else if(item == a[mid]) { return mid; } else if(item == a[start]) { return start; } else if(item == a[end]) { return end; } else if(item > a[mid]) BinarySearch(a, mid, end, item, iter); else BinarySearch(a, start, mid, item, iter); } int main() { int n, i, flag=0, Bin, len = 9, a[10]={1, 7, 15, 26, 29, 35, 38, 40, 49, 51}; cout<<"\nEnter the number of element in the search sequence: "; cin>>n; int b[n]; for(i = 0; i < n; i++) { cin>>b[i]; } Bin = BinarySearch(a, 0, len, b[0], 0); if (Bin == -1) { cout<<"\nNot found."; return 0; } else { for(i = Bin; i < n+Bin; i++) if(a[i] != b[i-Bin]) flag = 4; if(flag == 4) cout<<"\nNot found."; else cout<<"\nSequence found between index "<<Bin<<" and "<<Bin+n<<"."; } return 0; }
आउटपुट
Enter the number of element in the search sequence: 4 15 26 29 35 Sequence found between index 2 and 6.