/in/foo.cc: In function 'int merge(int, int)':
/in/foo.cc:39:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(!x||!y)return x+y;int z=0;
  ^~
/in/foo.cc:39:23: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  if(!x||!y)return x+y;int z=0;
                       ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:98:6: warning: unused variable 'T' [-Wunused-variable]
  int T,n,m,i,x,y,k;char s[19];
      ^