Sum this up Code Chef Solution – Code Drive solution

About Sum this up Code Chef Solution

  • This is a coding contest based on algorithms, data structures, and problem-solving.
  • Organizer: The contest is hosted by NIT Trichy.
  • Prizes: NA
  • Registrations for prizes: NA

Problem: Sum this up Code Chef Solution

You are given an array AA with NN positive elements A1,A2,…,ANA1,A2,…,AN. You are also given a function SS on any array CC with length NN defined as follow:

S(C)S(C) = ∑i=1N(Ci−1+Ci+12−Ci)∑i=1N(Ci−1+Ci+12−Ci)

Note that conventionally, we define all elements outside the range of the array to have value 00. In this context, C0=CN+1=0C0=CN+1=0.

Consider the following process:

  • Choose a permutation PP of values from 11 to NN uniformly randomly.
  • Let BB be the array of NN elements B1,B2,…,BNB1,B2,…,BN, where Bi=APiBi=APi.

Define VV as the expected value of |S(B)||S(B)|. Find ⌊V⌋⌊V⌋.

Note :

  • |X||X| denotes absolute value of XX
  • ⌊X⌋⌊X⌋ is the greatest integer that does not exceed XX.

Input Format

  • The first line of the input contains an integer TT – the number of test cases. The test cases then follow.
  • The first line of each test case contains an integer NN – the size of array.
  • The second line of each test case contains NN integers A1,A2,…,ANA1,A2,…,AN – the elements of the array.

Output Format

For each testcase, output ⌊V⌋⌊V⌋ in a new line.


  • 1≤T≤101≤T≤10
  • 1≤N≤2⋅1051≤N≤2⋅105
  • 1≤Ai≤2⋅1051≤Ai≤2⋅105

Sample Input 1 

1 1
8 2 2

Sample Output 1 



  • Test case 22:
    • With P=[1,2,3]P=[1,2,3] or P=[1,3,2]P=[1,3,2], we obtain B=[8,2,2]B=[8,2,2], which has |S(B)|=|(0+22−8)+(8+22−2)+(2+02−2)|=5|S(B)|=|(0+22−8)+(8+22−2)+(2+02−2)|=5.
    • With P=[2,1,3]P=[2,1,3] or P=[3,1,2]P=[3,1,2], we obtain B=[2,8,2]B=[2,8,2], which has |S(B)|=|(0+82−2)+(2+22−8)+(8+02−2)|=2|S(B)|=|(0+82−2)+(2+22−8)+(8+02−2)|=2.
    • With P=[2,3,1]P=[2,3,1] or P=[3,2,1]P=[3,2,1], we obtain B=[2,2,8]B=[2,2,8], which has |S(B)|=|(0+22−2)+(2+82−2)+(2+02−8)|=5|S(B)|=|(0+22−2)+(2+82−2)+(2+02−8)|=5.

Therefore V=5+5+2+2+5+56=4V=5+5+2+2+5+56=4. We output ⌊V⌋=4⌊V⌋=4.

Solution : Sum this up Code Chef Solution


int ans(void);

int main(void)
    int t;

int ans(void)
    int n,k;
    scanf("%i %i",&n,&k);
    int l[n];
    int m[n];
    for (int i=0;i<n;i++)
        m[i] = k-l[i];
    for (int i=0;i<n-1;i++)
        for (int j=i+1;j<n;j++)
            if (m[i] ==l[j])
                return 0;
    return 0;


Contest Details:

  • This is an External Rated Contest.
  • Duration: 3 Hours
  • Start time: 30th December 2021, 20:00 hrs IST
  • End time: 30th December 2021, 23:00 hrs IST
    You may check your timezone here.
  • This contest is rated only for Division 2 and Division 3 users. Division 1 users can participate unofficially in this contest.

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