Compilare: user.cpp: In function ‘void sortareTopologica(int)’: user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void comp_tare(int)’: user.cpp:72: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:180: warning: comparison between signed and unsigned integer expressions user.cpp:144: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:146: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:149: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:155: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result