Compilare: user.cpp: In function ‘int main()’: user.cpp:51:22: warning: unused variable ‘u’ [-Wunused-variable] int i, j, c = 0, u = -1; ^ user.cpp:52:12: warning: unused variable ‘mem’ [-Wunused-variable] double mem; ^ user.cpp:54:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("paznici.in", "r", stdin); ^ user.cpp:55:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("paznici.out", "w", stdout); ^ user.cpp:57:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d\n", &n, &m); ^ user.cpp:59:17: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets (s); ^ /tmp/ccgeUBAZ.o: In function `main': user.cpp:(.text.startup+0x92): warning: the `gets' function is dangerous and should not be used.