Update algorithm_depth_first_search.rst
Update algorithm_depth_first_search.rst
gusyussh/learntosolveit,adeshmukh/learntosolveit,whcdanny/learntosolveit,gusyussh/learntosolveit,beqa2323/learntosolveit,shabbir005/learntosolveit,beqa2323/learntosolveit,adsznzhang/learntosolveit,beqa2323/learntosolveit,gusyussh/learntosolveit,shabbir005/learntosolveit,shabbir005/learntosolveit,adeshmukh/learntosolveit,gusyussh/learntosolveit,adsznzhang/learntosolveit,gusyussh/learntosolveit,beqa2323/learntosolveit,beqa2323/learntosolveit,shabbir005/learntosolveit,adeshmukh/learntosolveit,whcdanny/learntosolveit,gusyussh/learntosolveit,whcdanny/learntosolveit,adeshmukh/learntosolveit,shabbir005/learntosolveit,whcdanny/learntosolveit,shabbir005/learntosolveit,adeshmukh/learntosolveit,gusyussh/learntosolveit,beqa2323/learntosolveit,adeshmukh/learntosolveit,adsznzhang/learntosolveit,gusyussh/learntosolveit,adsznzhang/learntosolveit,whcdanny/learntosolveit,shabbir005/learntosolveit,gusyussh/learntosolveit,adsznzhang/learntosolveit,whcdanny/learntosolveit,adsznzhang/learntosolveit,shabbir005/learntosolveit,shabbir005/learntosolveit