题解 | 多组_带空格的字符串_T组形式
a = int(input())
for i in range(a):
b = int(input())
c = input()
for j in range(b-1, -1, -1):
if c[j] != ' ':
print(c[j], end='')
print()
a = int(input())
for i in range(a):
b = int(input())
c = input()
for j in range(b-1, -1, -1):
if c[j] != ' ':
print(c[j], end='')
print()
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