{"raw_statement":[{"iden":"problem statement","content":"Given is a number sequence $A$ of length $N$.  \nFind the sum of squared differences of every pair of elements: $\\displaystyle \\sum_{i = 2}^{N} \\sum_{j = 1}^{i - 1} (A_i - A_j)^2$."},{"iden":"constraints","content":"*   $2 \\le N \\le 3 \\times 10^5$\n*   $|A_i| \\le 200$\n*   All values in input are integers."},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$N$\n$A_1$ $A_2$ $A_3$ $\\cdots$ $A_N$"},{"iden":"sample input 1","content":"3\n2 8 4"},{"iden":"sample output 1","content":"56\n\nWe have $\\sum_{i = 2}^{N} \\sum_{j = 1}^{i - 1} (A_i - A_j)^2 = (8 - 2)^2 + (4 - 2) ^ 2 + (4 - 8) ^ 2 = 56$."},{"iden":"sample input 2","content":"5\n-5 8 9 -4 -3"},{"iden":"sample output 2","content":"950"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}