foo.cc:1:22: warning: '#pragma GCC optimize' is not a string or number [-Wpragmas]
 #pragma GCC optimize(fast)
                      ^~~~
foo.cc: In function 'int main()':
foo.cc:68:23: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
          if(i==1&&j==1&&s[j-1]=='L'||i==n&&j==m&&s[j-1]=='L'){
             ~~~~~~~~~~^~~~~~~~~~~~~

自豪的采用 HydroJudger 进行评测(github.com/hydro-dev/HydroJudger)

{"receive":"2020-05-23T07:24:05.194Z","handle":"2020-05-23T07:24:05.194Z","cache_start":"2020-05-23T07:24:05.201Z","read_cases":"2020-05-23T07:24:05.620Z","judge":"2020-05-23T07:24:05.621Z","done":"2020-05-23T07:24:08.061Z"}