Compilare: user.cpp: In function ‘int main()’: user.cpp:45:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kbubblesort.in", "r", stdin); ^ user.cpp:46:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kbubblesort.out", "w", stdout); ^ user.cpp:54:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n, &k); ^ user.cpp:55:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(BUFF); ^ /tmp/ccOkO9EV.o: In function `main': user.cpp:(.text.startup+0x9b): warning: the `gets' function is dangerous and should not be used.