postmen.cpp: In function 'void dfs(int)':
postmen.cpp:30:9: error: 'ptintf' was not declared in this scope
else ptintf(" ");
^~~~~~
postmen.cpp:30:9: note: suggested alternative: 'printf'
else ptintf(" ");
^~~~~~
printf
postmen.cpp: In function 'int main()':
postmen.cpp:41:17: error: expected unqualified-id before '&' token
scanf("%d%d" . &n , &m);
^
postmen.cpp:43:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d" , a + i , b + i);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~