Compilare: user.cpp: In function ‘void dfs(long int)’: user.cpp:50: warning: comparison between signed and unsigned integer expressions user.cpp:47: warning: unused variable ‘p’ user.cpp: In function ‘int main()’: user.cpp:65: warning: unused variable ‘test’ user.cpp:70: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result