Compilare: user.cpp: In function ‘int ret(int, int, int)’: user.cpp:24: warning: unused variable ‘l’ user.cpp:24: warning: unused variable ‘r’ user.cpp:28: warning: unused variable ‘ok’ user.cpp: In function ‘void Dijkstra(int)’: user.cpp:64: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:77: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:78: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:80: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:87: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:97: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result