// 最大子段和.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include<iostream>
using namespace std;
int MaxSum_test(int v[], int l, int r)
{
int k,sum = 0;
if (l ==r)
{
return v[l] >= 0 ? v[l]:0;
}
else
{
int center = (l+ r) / 2;
int lsum = MaxSum_test(v, l, center);
int rsum = MaxSum_test(v, center + 1, r);
int s1 = 0;
int lefts = 0;
for (k = center; k >= l; k--)
{
lefts += v[k];
if (lefts>s1)
s1 = lefts;
}
int s2 = 0;
int rights = 0;
for (k = center + 1; k <= r; k++)
{
rights += v[k];
if (rights>s2)
s2 = rights;
}
sum = s1 + s2;
if (sum<lsum)
sum = lsum;
if (sum<rsum)
sum = rsum;
}
return sum;
}
int _tmain(int argc, _TCHAR* argv[])
{
int arr[6] = { -20, 11, -4, 13, -5, -2 };
cout <<"最大子段长度为:"<< MaxSum_test(arr, 0, 5) << endl;
return 0;
}
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