/in/foo.cc: In function 'int main()':
/in/foo.cc:13:11: warning: unused variable 'sum' [-Wunused-variable]
  long int sum = 0;
           ^~~
/in/foo.cc:30:10: warning: 'temp2' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(temp1+temp2 == m)
     ~~~~~^~~~~~
/in/foo.cc:23:70: warning: 'temp1' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if((x1+x2 == m &&x1<x2 &&x1<temp1 )||(x1+x2 == m &&x1<x2 &&temp1 == 0))
                                                                ~~~~~~^~~~