51Nod 1049 最大子段和

题目链接：https://www.51nod.com/onlineJudge/questionCode.html#!problemId=1049

 #include<iostream>
 #include<algorithm>
 using namespace std;
 long long a[];
 long long b[];
 int main()
 {
     int n;
     cin>>n;
     for(int i=;i<n;i++){
         cin>>a[i];
     }
     long long sum=;
     b[]=a[];
     for(int i=;i<n;i++){
         if(b[i-]>){
             b[i]=b[i-]+a[i];
         }
         else{
             b[i]=a[i];
         }
         if(b[i]>sum)sum=b[i];
     }
     cout<<sum<<endl;
     return ;
 }