k=input()
m=input().split(" ")
num=0
tested=[]
for i in m:
    for j in m:
        if str(int(i)+int(j)) in m and i!=j and not [i,j] in tested and not [j,i] in tested:
            num+=1
            tested.append([i,j])
print(num)

我这个也报Runtime Error

为何还是错的·······

much = int(input(''))
number = input('')
numsz = [int(x) for x in number.split(' ')]
sum = 0
numsz2=numsz[:]
for i in range(much):
for x in range(1, much):
if (x+i) < much:
if numsz[i] != numsz[x+i]:
jj = numsz[i]+numsz[x+i]
if jj in numsz2:
if (numsz[i] != jj):
if (numsz[x+i] != jj):
sum += 1
numsz2.remove(jj)
print (sum)