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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5.     int t;
  6.     cin>>t;
  7.     for(int xy=1;xy<=t;xy++)
  8.     {
  9.         int n;
  10.         cin>>n;
  11.         int a[n];
  12.         long long int sum=0;
  13.         for(int j=0;j<(n);j++)
  14.             {
  15.                 cin>>a[j];
  16.                 if((j%2)==0)
  17.                     sum=sum+a[j];
  18.             }
  19.         vector<int> v1;
  20.         for(int i=1;i<(n);i=i+2)
  21.         {
  22.             v1.push_back(a[i]-a[i-1]);
  23.         }
  24.         vector<int> v2;
  25.         for(int i=2;i<n;i=i+2)
  26.         {
  27.             v2.push_back(a[i-1]-a[i]);
  28.         }
  29.         long long int sum1=0;
  30.         long long int maxi1=0;
  31.         for(int i=0;i<v1.size();i++)
  32.         {
  33.             sum1=sum1+v1[i];
  34.             if(sum1<0)
  35.                 sum1=0;
  36.             else
  37.                 maxi1=max(maxi1,sum1);
  38.         }
  39.         sum1=0;
  40.         for(int i=0;i<v2.size();i++)
  41.         {
  42.             sum1=sum1+v2[i];
  43.             if(sum1<0)
  44.                 sum1=0;
  45.             else
  46.                 maxi1=max(maxi1,sum1);
  47.         }
  48.         cout<<(sum+maxi1)<<endl;
  49.     }
  50. }
  51.  
Success #stdin #stdout 0s 4388KB
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https://ideone.com/NT3pbQ
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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