I solved it this way with Python: 1. put all the numbers in one sorted array followed the rule that the start of the range must be before the end of the range at the same point. For that I converted int to float and for the start of the range I deducted 0.2 for players and 0.1 for shots, and for the end added. 2. loop through that array def solve(shots, players): # Write your code here cur_shots, cur_players, strenths = 0, 0, 0 arr_pl_sh = [] for i in range(len(players)): arr_pl_sh.append(float(players[i][0]) - 0.2) arr_pl_sh.append(float(players[i][1]) + 0.2) for i in range(len(shots)): arr_pl_sh.append(float(shots[i][0]) - 0.1) arr_pl_sh.append(float(shots[i][1]) + 0.1) arr_pl_sh.sort() for x in arr_pl_sh: if (str(x)[-1] == "8"): cur_players += 1 strenths += cur_shots elif (str(x)[-1] == "9"): cur_shots += 1 strenths += cur_players elif (str(x)[-1] == "2"): cur_players -= 1 elif (str(x)[-1] == "1"): cur_shots -= 1 return strenths