dataSet1.txt

0   This is the first document. Present in all k docs. In mathematics, graph theory is the study of graphs, which are mathematical structures used to model pairwise relations between objects. A graph in this context is made up of vertices (also called nodes or points) which are connected by edges (also called links or lines). A distinction is made between undirected graphs, where edges link two vertices symmetrically, and directed graphs, where edges link two vertices asymmetrically. Graphs are one of the principal objects of study in discrete mathematics.
1   This is the second document. Present in all k docs. There are many problems in which you need to query on intervals or segments of a collection of items. For example, finding the sum of all the elements in an array from index left to right, or finding the minimum of all the elements in an array from index left to right. These problems can be easily solved with one of the most powerful data structures, Segment Tree ( in-short Segtree ). 
2   This is the third document. Present in all k docs. The Office is an American mockumentary sitcom television series that depicts the everyday work lives of office employees in the Scranton, Pennsylvania, branch of the fictional Dunder Mifflin Paper Company. It aired on NBC from March 24, 2005, to May 16, 2013, lasting a total of nine seasons. Based on the 2001–2003 BBC series of the same name created by Ricky Gervais and Stephen Merchant, it was adapted for American television by Greg Daniels, a veteran writer for Saturday Night Live, King of the Hill, and The Simpsons. It was co-produced by Daniels's Deedle-Dee Productions, and Reveille Productions (later Shine America), in association with Universal Television. The original executive producers were Daniels, Gervais, Merchant, Howard Klein, and Ben Silverman, with numerous others being promoted in later seasons.