Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:207: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int flow()’: user.cpp:249: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void df(int)’: user.cpp:291: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:303: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:304: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:306: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:310: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result