10 examples of 'find largest sum contiguous subarray' 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 < 0:21            current = 022        current += nums[i]23        m = max(current, m)24    return m``
``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<<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 < 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 < 0:49            cur = 05051    maxa = -1<<3152    for i in xrange(1, n):53        maxa = max(maxa, f[0][i]+f[1][i])54    return maxa``
``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``
``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: continue15        while _sum >= s:16            _sum -= nums[left]17            left +=118        left -=119        _sum+=nums[left]20        21        if i-left+1<_min:22            _min = i-left+123    if _min == sys.maxint:24        return 025    return _min``
``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] > 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``
``2def splitArray(self, nums, m):3    """4    :type nums: List[int]5    :type m: int6    :rtype: int7    """8    def cut(nums, mid, m):9        count = 110        current_sum = 011        for num in nums:12            current_sum += num13            if current_sum > mid:14                count += 115                current_sum = num16                if count > m:17                    return False18        return True1920    low = max(nums)21    high = sum(nums)22    while low <= high:23        mid = (low + high) // 224        cuts = cut(nums, mid, m)25        if cuts:26            high = mid - 127        else:28            low = mid + 129    return low``
``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)``
``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 < len(nums) and sums < s):15            sums += nums[j]16            j += 117        18        if (sums >= s):19            res = min(res, j - i)20        21        sums -= nums[i]22    23    return 0 if res == float('inf') else res``
``23def threeSum(self, nums):24    """25    :type nums: List[int]26    :rtype: List[List[int]]27    """28    nums.sort()29    res = []3031    for i in range(len(nums)-1):  # because sums of 3 numbers32        if i == 0 or i > 0 and nums[i-1] != nums[i]:33        # avoid duplicate triplets [1 ,1, 1, -2]34            left = i + 135            right = len(nums) - 136            while left < right:   # two-way pointer37                s = nums[i] + nums[left] + nums[right]38                if s == 0:39                    res.append([nums[i], nums[left], nums[right]])40                    left += 141                    right -= 142                    while left < right and nums[left] == nums[left - 1]:43                        left += 144                    while right > left and nums[right] == nums[right + 1]:45                        right -= 146                elif s < 0:47                    left += 148                else:49                    right -= 150    return res``
``2def arrayPairSum(self, nums):3    """4    https://leetcode.com/problems/array-partition-i/description/5    :type nums: List[int]6    :rtype: int7    """8    nums = sorted(nums)9    sum = 010    for i in range(0,len(nums),2):11        sum += nums[i]12    return sum``