char x[100] -- is Wa
while char x[101] -- is AC

If you think that n > 100 in some tests, you can write in your program:

if (n > 100) for(;;);

If some test is incorrect you will get "Time limit exceeded" on this test.

But in all tests in this problem n <= 100. So there is a problem in your program, not in tests.

c/c++ array size is kind of not stable. For string-related problem, i prefer pascal

A C-string uses 1 additional symbol (with number 0) as the end of line. So u have to create an array with 100+1=101 symbol.