Hi priya ,
To get admission into any prestigious college of engineering like iit is a tough job and iit delhi is one of the best iit in india.
As weall knoe computer science is one of the core branches so it has high closing cutoff for the candidates to get admission. With all this data the rank one should get in jee advance to get admission into iit delhi with computer science branch should be less than 90 .

Hope it helps!!!