50 lines
936 B
Python
50 lines
936 B
Python
|
def min_new(a, m):
|
||
|
|
while m in a:
|
||
|
|
m+=1
|
||
|
|
return m
|
||
|
|
|
||
|
|
def max_new(a: set[int], m):
|
||
|
|
while m in a:
|
||
|
|
m-=1
|
||
|
|
|
||
|
|
return m
|
||
|
|
|
||
|
|
def get_minimal(a, n):
|
||
|
|
used = set(a)
|
||
|
|
if len(used) != len(a):
|
||
|
|
return [-1]
|
||
|
|
|
||
|
|
arr = []
|
||
|
|
for i in range(n//2):
|
||
|
|
m = max_new(used, a[i])
|
||
|
|
used.add(m)
|
||
|
|
if m <= 0:
|
||
|
|
return [-1]
|
||
|
|
|
||
|
|
arr.append(m)
|
||
|
|
|
||
|
|
for i in range(n//2):
|
||
|
|
for j in range(i, n//2):
|
||
|
|
if arr[j] < arr[i] and arr[i] < a[j]:
|
||
|
|
tmp = arr[j]
|
||
|
|
arr[j] = arr[i]
|
||
|
|
arr[i] = tmp
|
||
|
|
|
||
|
|
return arr
|
||
|
|
|
||
|
|
# Réécrire en c++
|
||
|
|
def main():
|
||
|
|
ct = int(input())
|
||
|
|
|
||
|
|
for i in range(ct):
|
||
|
|
n = int(input())
|
||
|
|
a = [int(b) for b in input().split()]
|
||
|
|
|
||
|
|
arr = get_minimal(a, n)
|
||
|
|
if arr == [-1]:
|
||
|
|
print(-1)
|
||
|
|
else:
|
||
|
|
print(" ".join([str(arr[i])+" "+str(a[i]) for i in range(len(arr))]))
|
||
|
|
|
||
|
|
main()
|