## 2017年2月26日 星期日

### 【Python】Codility in Python : Lesson 9 - Maximum slice problem【MaxSliceSum】

Maximum slice problem 第三題：【MaxSliceSum】
Find a maximum sum of a compact subsequence of array elements.

A non-empty zero-indexed array A consisting of N integers is given.
A pair of integers (P, Q), such that 0 ≤ P ≤ Q < N, is called a slice of array A.
The sum of a slice (P, Q) is the total of A[P] + A[P+1] + ... + A[Q].

Write a function:

def solution(A)

that, given an array A consisting of N integers, returns the maximum sum of any slice of A.

For example, given array A such that:

A = 3 A = 2 A = -6
A = 4 A = 0

the function should return 5 because:

(3, 4) is a slice of A that has sum 4,
(2, 2) is a slice of A that has sum −6,
(0, 1) is a slice of A that has sum 5,

no other slice of A has sum greater than (0, 1).

Assume that:
N is an integer within the range [1..1,000,000];
each element of array A is an integer within the range [−1,000,000..1,000,000];
the result will be an integer within the range [−2,147,483,648..2,147,483,647].

Correctness：100%、Performance：100%
```python def solution(S): maxSlice = 0 result = A length = len(A) for value in A: maxSlice = max(value, maxSlice + value) result = max(result, maxSlice) return result ```