foo.cc: In function 'int main()':
foo.cc:30:6: warning: unused variable 'i' [-Wunused-variable]
  int i,j,k;
      ^
foo.cc:30:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k;
        ^
foo.cc: In function 'void init()':
foo.cc:12:13: warning: iteration 109 invokes undefined behavior [-Waggressive-loop-optimizations]
    mp1[i][j]=Maxn;
    ~~~~~~~~~^~~~~
foo.cc:10:16: note: within this loop
   for(int j=1;j<=110;j++)
               ~^~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。