Compilare: user.cpp: In function ‘int ret(int, int, int)’: user.cpp:27: warning: unused variable ‘l’ user.cpp:27: warning: unused variable ‘r’ user.cpp:31: warning: unused variable ‘ok’ user.cpp: In function ‘void Dijkstra(int)’: user.cpp:69: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:82: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:83: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:85: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:88: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:98: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result