Could not get right answers

Question

https://code.sololearn.com/cEIZN6ssd3n9/#c

Input Sample Output Sample
7

4 5

13 10

6 4

3 3

3 5

3 4

3 8
///////
output

0

11

5

0

0

0

12

Answer 1

Read N before the loop.
Make first loop condition i<N instead of i<=N
Make sum = 0 inside the loop.