Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:56: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void citire()’: user.cpp:72: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:75: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int ciclu(int, nod*&, nod*&)’: user.cpp:116: warning: comparison between signed and unsigned integer expressions user.cpp:129: warning: comparison between signed and unsigned integer expressions