/in/foo.cc: In function 'void bfs(int, int, int)':
/in/foo.cc:18:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(an>ans)return ;num[x+1][0]=0;
  ^~
/in/foo.cc:18:20: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  if(an>ans)return ;num[x+1][0]=0;
                    ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:37:16: warning: unused variable 'cnt' [-Wunused-variable]
  cin>>n>>m;int cnt=0;
                ^~~