Score of Tiya

Tiya is appearing for an exam which has 2 rounds $r1$ and $r2$. Each round consists of $N$ subjects. Tiya's score in $N$ subjects is given in the form of an array for both the rounds. $ r1[i]$ for round 1 where $1 \leq i\leq N $ and $r2[j]$ for round 2 where $1 \leq j \leq N $. Tiya's teacher has set a target $K$ for all students to see how close can the students score to the target. Your task