foo.cc: In function 'int main()':
foo.cc:14:5: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   if(nn1[l]<=min1)
     ^
foo.cc:24:5: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   if(nn2[j]<=min2)
     ^

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