# 10 examples of 'maximum frequent subarray sum' in Python

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``9def maxSubArray(self, nums):10    """11    :type nums: List[int]12    :rtype: int13    """14    if not nums:15        return 016    length = len(nums)17    current = nums[0]18    m = current19    for i in range(1, length):20        if current &lt; 0:21            current = 022        current += nums[i]23        m = max(current, m)24    return m``
``13def max_subarray(nums):14    """15    :type nums: List[int]16    :rtype: int17    """18    currsum, maxn = 0, float('-inf')19    for i in range(len(nums)):20        if currsum + nums[i] &gt; 0:21            currsum += nums[i]22            maxn = max(maxn, currsum)23        else:				# to get max of -ve integers24            currsum = 025            maxn = max(maxn, nums[i])26    return maxn``
``67def test_5(self):68    arr = [-1, -2, -3, -4, -5]69    self.assertEquals(120, self.solution.maxProduct(arr))``
``4def find_max_subarray(numbers):5    max_till_here = [0]*len(numbers)6    max_value = 07    for i in range(len(numbers)):8        max_till_here[i] = max(numbers[i], max_till_here[i-1] + numbers[i])9        max_value = max(max_value, max_till_here[i])10    return max_value``
``35def topKFrequent2(self, nums, k):36    """37    :type nums: List[int]38    :type k: int39    :rtype: List[int]40    """41    import heapq42    m = {}43    for num in nums:44        if num not in m:45            m[num] = 146        else:47            m[num] += 14849    lst = []50    for e in m:51        heapq.heappush(lst, (-m[e], e))52    res = []53    for i in range(k):54        res.append(heapq.heappop(lst)[1])55    return res``
``2def minSubArrayLen(self, s, nums):3    """4    :type s: int5    :type nums: List[int]6    :rtype: int7    """8    # sliding window 9    left = 010    _min = sys.maxint11    _sum = 012    for i in range(len(nums)):13        _sum = _sum+nums[i]14        if _sum= s:15            _sum -= nums[left]16            left +=117        left -=118        _sum+=nums[left]19        20        if i-left+1&lt;_min:21            _min = i-left+122    if _min == sys.maxint:23        return 024    return _min``
``22def maxTwoSubArrays(self, nums):23    """24    dp max subarray2526    fi for subarry that ends WITH OR BEFORE i27     28    f1 for forward sweeping29    f2 for backward sweeping30    :param nums: A list of integers31    :return: An integer denotes the sum of max two non-overlapping subarrays32    """33    n = len(nums)3435    f = [[-1&lt;&lt;31 for _ in xrange(n+1)] for _ in xrange(2)]3637    cur = 038    for i in xrange(1, n+1):39        cur += nums[i-1]40        f[0][i] = max(nums[i-1], f[0][i-1], cur)41        if cur &lt; 0:42            cur = 04344    cur = 045    for i in xrange(n-1, -1, -1):46        cur += nums[i]47        f[1][i] = max(nums[i], f[1][i+1], cur)48        if cur &lt; 0:49            cur = 05051    maxa = -1&lt;&lt;3152    for i in xrange(1, n):53        maxa = max(maxa, f[0][i]+f[1][i])54    return maxa``
``2def minSubArrayLen(self, s, nums):3    """4        :type s: int5        :type nums: List[int]6        :rtype: int7        """8    9    j = 010    res = float('inf')11    sums = 012    13    for i in range(len(nums)):14        while (j &lt; len(nums) and sums &lt; s):15            sums += nums[j]16            j += 117        18        if (sums &gt;= s):19            res = min(res, j - i)20        21        sums -= nums[i]22    23    return 0 if res == float('inf') else res``
``13def find_max_subarray2(numbers):14    max_till_here = [numbers[0]]15    for n in numbers[1:]:16        max_till_here.append(max(n, max_till_here[-1] + n))17    return max(max_till_here)``
``3def arrayNesting2(self, nums):4    sets, l = [], [0] * len(nums)5    for i in range(len(nums)):6        for s in sets:7            if nums[i] in s:8                l[i] = len(s)9                break10        if not l[i]:11            s = set()12            j = i13            while nums[j] not in s:14                s.add(nums[j])15                j = nums[j]16            l[i] = len(s)17            if len(s) &gt; 1: sets.append(s)18    return max(l)``