URAL 1296. Hyperjump（最大子序列和）
來源：程序員人生 發布時間：2015-03-30 08:56:29 閱讀次數：3677次
題目鏈接： http://acm.timus.ru/problem.aspx?space=1&num=1296
Developed in the beginning of XXI century, hyperjump remains the primary method of transportation for distances up to thousands parsecs. But physicists have recently discovered an amazing phenomenon.
They believe the duration of the hyperjump alpha phase can be easily controlled. Alpha phase is the period when hyper-spacecraft accumulates its gravity potential. The larger is the gravity potential accumulated, the less energy is required to complete the
hyperjump. Your task is to write a program, which would help pilots decide when to enter and when to leave the alpha-phase, in order for the hyperspacecraft to accumulate the largest possible gravity potential.
The most crude gravity field model (which you will have to use) yields the sequence of integers pi, which represent
field intensities at different moments in time. According to this model, if the alpha-phase begins at moment i and ends at moment j, then the value of gravity potential accumulated will be equal to the sum of sequence elements at places from i-th
to j-th inclusive.
Input
The first line of the input contains an integer N being the number of elements in the intensity values sequence (0 ≤ N ≤ 60000). Next N lines specify sequence
elements, each line containing a single integer pi (?30000 ≤ pi ≤ 30000).
Output
The only line of output contains the largest possible value of the gravity potential that can be accumulated by a hyperspacecraft during the alpha phase. You should assume that the initial gravity potential
of a hyperspacecraft is equal to zero.
Samples
|
input |
output |
|
10
31
⑷1
59
26
⑸3
58
97
⑼3
⑵3
84
|
187
|
|
3
⑴
⑸
⑹
|
0
|
PS:
如果最小和小于零 ，輸出零！
代碼以下：
#include <cstdio>
int main()
{
int n;
int a[60047];
while(~scanf("%d",&n))
{
for(int i = 0; i < n; i++)
{
scanf("%d",&a[i]);
}
int maxx = 0, sum = 0;
for(int i = 0; i < n; i++)
{
sum+=a[i];
if(sum <= 0)
{
sum = 0;
}
if(sum > maxx)
{
maxx = sum;
}
}
printf("%d
",maxx);
}
return 0;
}
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