Code360 powered by Coding Ninjas X Naukri.com. Code360 powered by Coding
Ninjas X Naukri.com

Problem of the day

Bob lives with his wife in a city named Berland. Bob is a good husband, so he goes out with his wife every Friday to ‘Arcade’ mall.

‘Arcade’ is a very famous mall in Berland. It has a very unique transportation method between shops. Since the shops in the mall are laying in a straight line, you can jump on a very advanced trampoline from the shop i, and land in any shop between (i) to (i + Arr[i]), where Arr[i] is a constant given for each shop.

There are N shops in the mall, numbered from 0 to N-1. Bob's wife starts her shopping journey from shop 0 and ends it in shop N-1. As the mall is very crowded on Fridays, unfortunately, Bob gets lost from his wife. So he wants to know, what is the minimum number of trampoline jumps from shop 0 he has to make in order to reach shop N-1 and see his wife again. If it is impossible to reach the last shop, return -1.

Detailed explanation

```
1 <= T <= 10
1 <= N <= 5 * 10^4
0 <= Arr[i] <= N
Where T is the number of test cases, N is the size of the array and Arr[i] is the ith element in the array.
```

```
2
5
2 1 3 2 4
3
3 2 1
```

```
2
1
```

```
In the 1st test case, Bobs jumps from shop 0 to shop 2 and then jumps from shop 2 to shop 4, so he needs two jumps to reach the last shop.
In the 2nd test case, Bobs jumps from shop 0 to shop 2, so he needs only one jump to reach the last shop.
```

```
2
5
1 0 3 2 1
4
1 1 1 1
```

```
-1
3
```