Eroare de compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:13: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:20: error: ‘stdin’ was not declared in this scope user.cpp:20: error: ‘freopen’ was not declared in this scope user.cpp:21: error: ‘stdout’ was not declared in this scope user.cpp:23: error: ‘scanf’ was not declared in this scope user.cpp:36: error: ‘printf’ was not declared in this scope user.cpp:37: error: ‘fclose’ was not declared in this scope