Question

Write a function which finds a substring in a string and replaces all such occurrences with another string. Prototype of the function :

      char* FindReplace(char* src, char* find, char* replace);

Test case 1:

INPUT:
SRC[] = “SIVASAI”.
find[] = “AS”
Replace[] = “ASAS”

OUTPUT:
SRC[] = “SIVASASAI”

Test case 2:
SRC[] = “SIVASAI”.
find[] = “VASA”
Replace[] = “A”

OUTPUT:
SRC[] = “SIAI”

Solution should be Time Efficient .

Answer 1

You can use:
1) Knuth–Morris–Pratt algorithm: http://en.wikipedia.org/wiki/Knuth-Morris-Pratt_algorithm
2) Boyer-Moore algorithm http://en.wikipedia.org/wiki/Boyer-Moore_string_search_algorithm
3) Rabin-Karp algorithm http://en.wikipedia.org/wiki/Rabin-Karp_string_search_algorithm