Compilare: user.cpp: In function ‘int dfs(graph*, int)’: user.cpp:139: warning: no return statement in function returning non-void user.cpp: In function ‘int dfs_t(graph*, int)’: user.cpp:156: warning: no return statement in function returning non-void user.cpp: In function ‘int main()’: user.cpp:200: warning: comparison between signed and unsigned integer expressions user.cpp:201: warning: comparison between signed and unsigned integer expressions user.cpp:163: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:164: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:166: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:173: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result