핵심은 power함수의 logN화. 1번 50점. import sys input = sys.stdin.readline N = int(input()) menus = sorted(map(int,input().split())) MOD = 1000000007 minus = 0 for i in range(N-1): for j in range(i+1,N): minus += ((menus[j] - menus[i])*(2**(j-i-1)))%MOD print(minus%MOD) 2번 50점 N = int(input()) menus = sorted(map(int,input().split())) MOD = 1000000007 minus = 0 plus = 0 for i in range(N): minus += (menus[..