Compilare: user.cpp: In function ‘void Read_data()’: user.cpp:89: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:91: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void Solve()’: user.cpp:170: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void Write()’: user.cpp:183: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:189: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:190: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result