long time ago symmetric array a_1a_2ldotsa_2n consist 2n distinct integer Array a_1a_2ldotsa_2n call symmetric integer 1 le le 2n exist integer 1 le j le 2n a_i a_jFor integer 1 le le 2n Nezzar write integer d_i equal sum absolute difference a_i integer ie d_i sum_j 12n a_i a_jnow million year pass Nezzar barely remember array d totally forget Nezzar wonder exist symmetric array consist 2n distinct integer generate array d