Compilare: user.cpp: In function ‘void Read()’: user.cpp:86: 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: In function ‘bool Check(const line&, const int&)’: user.cpp:149: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void Solve()’: user.cpp:217: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void Write()’: user.cpp:229: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:235: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:236: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result