Compilare: user.cpp: In function ‘int find(const std::pair<double, double>&)’: user.cpp:54: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int insert(const std::pair<double, double>&)’: user.cpp:65: warning: no return statement in function returning non-void user.cpp: In function ‘void Read_data()’: user.cpp:108: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:110: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘bool Pre()’: user.cpp:153: warning: no return statement in function returning non-void user.cpp: In function ‘void Solve()’: user.cpp:212: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void Write()’: user.cpp:224: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:230: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:231: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result