ACM 272 TEX Quotes

不難，但是我寫的code排名9000以後= =

#include <stdio.h>

int main(void)
{
    char ch;
    int flag;
   
    flag = 1;
    while ((ch = getchar()) != EOF)
        if (ch == '"')
            if (flag)
            {
                printf("``");
                flag = 0;
            }
            else
            {
                printf("''");
                flag = 1;
            }
        else
            putchar(ch);
   
    return 0;
}