Compilare: user.cpp: In member function ‘bool prog::operator<(const prog&) const’: user.cpp:12: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp: In function ‘void solve()’: user.cpp:26: warning: unused variable ‘x’ user.cpp: In function ‘int main()’: user.cpp:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:53: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result