Compilare: user.cpp: In function ‘int find(const std::pair<double, double>&)’: user.cpp:55: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int insert(const std::pair<double, double>&)’: user.cpp:66: warning: no return statement in function returning non-void user.cpp: In function ‘void Read_data()’: user.cpp:115: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:117: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void Solve()’: user.cpp:199: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void Write()’: user.cpp:212: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:218: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:219: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result