车厢重组 - 洛谷

"""

P1116 车厢重组（python3实现）--03
https://www.luogu.com.cn/problem/P1116

"""

sum=0

n=int(input())

a=[]

while len(a)<n: # 如果没有读够n个数字

            num = input()
            nums = num.strip().split()
            nums = [int(i) for i in nums]
            for i in nums:
                    a.append(i)

for i in range(n):
            for j in range(i):

                        if a[j]>a[i]:
                                    sum+=1

print(sum)

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