**Explanation**

The main idea is based on greedy. Let's say the range of the current jump is [curBegin, curEnd], curFarthest is the farthest point that all points in [curBegin, curEnd] can reach. Once the current point reaches curEnd, then trigger another jump, and set the new curEnd with curFarthest, then keep the above steps, as the following:

```
public int jump(int[] A) {
int jumps = 0, curEnd = 0, curFarthest = 0;
for (int i = 0; i < A.length - 1; i++) {
curFarthest = Math.max(curFarthest, i + A[i]);
if (i == curEnd) {
jumps++;
curEnd = curFarthest;
}
}
return jumps;
}
```