easy approach
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```cpp []
class Solution {
public:
    int numberOfChild(int n, int k) {
        int ans=0,j=0,f=1;
        for(int i=1;i<=k;i++){
            if(j==n-1)f=-1;
            else if(j==0)f=1;
            ans=j+f;
            j=ans;
        }
        return ans;
    }
};
```
['Math', 'Simulation', 'C++']