foo.cc: In function 'int main()':
foo.cc:28:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
         for(k=1;k<=lou[i][101];k++)
         ^~~
foo.cc:31:10: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
          if(k>lou[i][101])
          ^~
foo.cc:7:17: warning: unused variable 'ans' [-Wunused-variable]
     int n,m,i,k,ans=0,now,bian,sum=0;
                 ^~~

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