It's a C++ problem, the file words.txt can be found on google from many websites, Thank you !!!

The word ladder game was invented by Lewis Carroll in 1877. The idea is to begin with a start word and change one letter at a time until arriving at an end word. Each word along the way must be an English word. In other words, the task is to find a chain of words from the beginning word to the ending word. Each successive word only differed in one letter The word ladder game was invented by Lewis Carroll in 1877. The idea is to begin with a start word and change one letter at a time until arriving at an end word. Each word along the way must be an English word. In other words, the task is to find a chain of words from the beginning word to the ending word. Each successive word only differed in one letter