Jump is a simple one-player game:

You are initially at the first cell of an array of cells containing non-negative integers;

At each step you can jump ahead in the array as far as the integer at the current cell, or any smaller number of cells.
You win if there is a path that allows you to jump from one cell to another, eventually jumping past the end of the array, otherwise you lose.

For instance, if the array contains the integers 

`[2, 0, 3, 5, 0, 0, 3, 0, 0, 3, 1, 0]`,

you can win by jumping from **2**, to **3**, to **5**, to **3**, to **3**, then past the end of the array.

You can also directly jump from from the initial cell(first cell) past the end of the array if they are integers to the right of that cell.

E.g 

`[6, 1, 1]` is winnable

`[6]` is **not** winnable

Note: You can **not** jump from the last cell!

`[1, 1, 3]` is **not** winnable

## -----

Your task is to complete the function `canJump()`  that determines if a given game is winnable.

### More Examples

``` javascript
canJump([5]) //=> false
canJump([2, 5]) //=> true
canJump([3, 0, 2, 3]) //=> true (3 to 2 then past end of array)
canJump([4, 1, 2, 0, 1]) //=> false
canJump([5, 0, 0, 0]) //=> true
canJump([1, 1]) //=> false
```

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

def _disabled_input(*args, **kwargs):
    raise RuntimeError("input() is disabled in callable mode")
builtins.input = _disabled_input

ns = {"__name__": "__judge__"}  # prevent if __name__ == "__main__" blocks
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'def can_jump(arr):\n    x = len(arr)-1; p = []; i = 0; j = arr[i]; n = i+j\n    if not x or not(arr[0]): return False\n    while True:\n        if x<n: return True\n        while j and (n==x or not arr[n]): j -= 1; n = i+j\n        if not j:\n            if not p: return False\n            j = p.pop(); i -= j; j -= 1; continue\n        p.append(j); i += j; j = arr[i]; n = i+j\n'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'can_jump'
if _fn_name:
    if "Solution" in ns:
        try:
            _obj = ns["Solution"]()
            if hasattr(_obj, _fn_name):
                _target = getattr(_obj, _fn_name)
        except Exception:
            _target = None
    if _target is None and _fn_name in ns and callable(ns[_fn_name]):
        _target = ns[_fn_name]
# Fallback: if there's exactly one user-defined function, use it
if _target is None:
    _cands = [v for k, v in ns.items() if callable(v) and getattr(v, "__module__", "") in ("__judge__", "__main__")]
    _user_funcs = [c for c in _cands if getattr(c, "__name__", "").startswith("_") is False]
    if len(_user_funcs) == 1:
        _target = _user_funcs[0]
if _target is None:
    raise RuntimeError(f"Could not resolve callable '{_fn_name}'")

_raw = sys.stdin.read().strip()
if _raw:
    _parsed = json.loads(_raw)
    if isinstance(_parsed, dict):
        _kwargs = _parsed.get("kwargs", {})
        _args = _parsed.get("args", [])
    else:
        _args, _kwargs = _parsed, {}
else:
    _args, _kwargs = [], {}
if not isinstance(_args, (list, tuple)):
    _args = [_args]
_res = _target(*_args, **_kwargs)
try:
    sys.stdout.write(repr(_res) + "\n")
except Exception:
    pass

```

Measured memory_bytes: 5612