最大字段和

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 const int MAXN = 50000+5;
 5 int a[MAXN];
 6 int main()
 7 {
 8     int n;
 9     while(~scanf("%d",&n))
10     {
11         for(int i=1; i<=n; i++)
12             scanf("%d",&a[i]);
13         long long Max = 0, sum = 0;
14         for(int i=1; i<=n; i++)
15         {
16             //cout << sum << endl;
17             if(sum >= 0)
18                 sum += a[i];
19             else
20                 sum = a[i];
21             if(sum > Max)
22                 Max = sum;
23         }
24         printf("%lld\n",Max);
25     }
26     return 0;
27 }