Eroare de compilare: user.cpp: In function ‘void read()’: user.cpp:30: error: ‘strlen’ was not declared in this scope user.cpp:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void dfs(int, int)’: user.cpp:55: warning: comparison between signed and unsigned integer expressions