foo.c: In function 'main':
foo.c:34:9: warning: unused variable 'x' [-Wunused-variable]
     int x=strlen(s);
         ^
foo.c:29:18: warning: unused variable 'cha' [-Wunused-variable]
     char s[maxn],cha;
                  ^~~

自豪的采用jd5进行评测(github.com/masnn/jd5)

{"receive":"2020-02-23T06:40:56.895Z","handle":"2020-02-23T06:40:56.895Z","done":"2020-02-23T06:40:57.379Z"}