https://www.acmicpc.net/problem/1715
시간 제한 : 2초
메모리 제한 : 128MB
import heapq
n = int(input())
heap = []
for i in range(n):
data = int(input())
heapq.heappush(heap, data)
result = 0
while len(heap) != 1:
one = heapq.heappop(heap)
two = heapq.heappop(heap)
sum_value = one + two
result += sum_value
heapq.heappush(heap, sum_value)
print(result)