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20 lines
887 B
20 lines
887 B
4 months ago
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# work4 求最大字字段和（同例15的解法，此处为python版本写法）
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# o(n)时间复杂度，o(1)空间。
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# 一路扫描，currMaxSum为当前位置为止的最大和，当到下一个位置时，判断当前数字num加上currMaxSum是否会导致比当前num还小，
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# 如果当前数字num加上currMaxSum是否会导致比当前num还小，则说明最大的和不应从前面开始，而是*至少*应当从当前的数字开始
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# 下一步比较结果与当前的最大和哪个大，取更大的作为结果
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def findMaxSum(nums: list[int]) -> int:
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result = nums[0]
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currMaxSum = nums[0]
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for i in range(1, len(nums)):
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num = nums[i]
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currMaxSum = max(currMaxSum+num, num)
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result = max(result, currMaxSum)
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return result
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# test
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nums = [-2, 11, -4, -9, 13, -5, 7, -3]
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result = findMaxSum(nums)
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print("最大子段和:", result)
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