The question quotes:

“Now Chef is asking you to count the **number of ways to fill the missing numbers** (ie. the -1s) of the array with level numbers, so that it corresponds to a valid game. Since the answer can be large, output it modulo 109+7.”

So, if there is no missing number the count is **zero**.

But the solutions getting accepted outputs answer 1.

Why?

Question link: https://www.codechef.com/COOK79/problems/COOKGAME