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Problem

Submissions

JUMP GAME

Medium

0/80

Avg time to solve 40 mins

Success Rate 35 %

0 upvotes

Problem Statement

Given an array of non-negative integers ‘ARR’ of length ‘N’, you are initially positioned at the array's first index.

Each element in the array represents your maximum jump length at that position.

Return the minimum number of jumps required to reach the last index.

If it is not possible to reach the last index, return -1.

Example:

Input:

‘N’ = 3
‘ARR’ = [ 2, 1, 1 ]

The shortest way to reach index 2 is
Index 0 => Index 2
that requires only 1 jump.

Detailed explanation ( Input/output format, Notes, Constraints, Images )

Input Format:

The first line contains ‘T,’ denoting the number of test cases.

The first line of each test case contains ‘N’ denoting the size of the ‘ARR’.

The second line of each test case contains 'N' space-separated Integers denoting the ‘ARR’.

Output Format:

For each test case, Return the answer as described in the problem statement.

Output for each test case is printed on a separate line.

Note :

You don't need to print anything. It has already been taken care of. Just implement the given function.

Constraints :

1 <= T <= 10    
1 <= N <= 10000
0 <= ARR [ i ] <= N
Time Limit: 1 sec

Sample Input 1:

Sample Output 1:

2
3

Explanation Of Sample Input 1:

For the first test case:-
The optimal path is:
0 => 1 => 4

For the second test case:-
0 => 1 => 2 => 3

Sample Input 2:

Sample Output 2:

2
-1

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