/in/foo.cc: In function 'int main()':
/in/foo.cc:6:11: warning: unused variable 'm' [-Wunused-variable]
     int n,m,j,k,i,s=0;
           ^
/in/foo.cc:6:13: warning: unused variable 'j' [-Wunused-variable]
     int n,m,j,k,i,s=0;
             ^
/in/foo.cc:6:15: warning: unused variable 'k' [-Wunused-variable]
     int n,m,j,k,i,s=0;
               ^
/in/foo.cc:12:12: warning: iteration 9 invokes undefined behavior [-Waggressive-loop-optimizations]
   if(n>=a[i])s++;
         ~~~^
/in/foo.cc:11:11: note: within this loop
  for(i=1;i<=10;i++)
          ~^~~~