A coding competition is beingorganized on the HackerRankplatform.All participants needto be grouped into teams whereeach team has exactly twocandidates and the sums oftheir skills must be equal for allteams. The efficiencyof a teamis the product of the skills of itsmembers, e.g. for a team withskills [2, 3], the efficiency of the team is 2 * 3 = 6. Find the sum of the efficienciesof the teams. If there is no wayto create teams that satisfy theconditions, return -1