Compilare: user.cpp: In function ‘int heapup()’: user.cpp:21: warning: no return statement in function returning non-void user.cpp: In function ‘int heapdown()’: user.cpp:33: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:33: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:54: warning: no return statement in function returning non-void user.cpp: In function ‘int heapsort()’: user.cpp:60: warning: no return statement in function returning non-void user.cpp: In function ‘int main()’: user.cpp:63: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:64: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:65: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result