简单题

#include

<

iostream

>

#include

<

cstdio

>

#include

<

cstdlib

>

#include

<

cstring

>

using

namespace

std;

int

main()

{

//

freopen("t.txt", "r", stdin);

char

ch;

bool

first

=

true

;

while

((ch

=

getchar())

!=

EOF)

{

if

(ch

==

'

"

'

)

{

if

(first)

{

printf(

"

``

"

);

first

=

false

;

}

else

{

printf(

"

''

"

);

first

=

true

;

}

}

else

{

putchar(ch);

}

}

return

0

;

}