Eroare de compilare: user.cpp:6:18: error: stdlib: No such file or directory user.cpp: In function ‘long double dist(int, int, int, int)’: user.cpp:16: error: ‘abs’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:70: warning: comparison between signed and unsigned integer expressions user.cpp:22: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:23: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result