/in/foo.c: In function 'main':
/in/foo.c:12:3: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   else
   ^~~~
/in/foo.c:18:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
    if(m==s)
    ^~
/in/foo.c:4:12: warning: unused variable 'r' [-Wunused-variable]
  int n,i,s,r=0,m=0,k=0,a;
            ^