Algorithm to find the smallest snippet from searching a document?

Question

I\'ve been going through Skiena\'s excellent \"The Algorithm Design Manual\" and got hung up on one of the exercises.

The question is: \"Given a search string of three w

Answer 1

O(n)

Pair find(int[][] indices) {
pair.lBound = max int;
pair.rBound = 0;
index = 0;

for i from 0 to indices.lenght{
    if(pair.lBound > indices[i][0]){
        pair.lBound = indices[i][0]
        index = i;
    }
    if(indices[index].lenght > 0)
        pair.rBound = max(pair.rBound, indices[i][0])
}
remove indices[index][0]

return min(pair, find(indices)}