Compilare: user.cpp: In function ‘int main()’: user.cpp:70:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (r = 0; r < H[auxF].size() && !ok; ++r) ^ user.cpp:92:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (r = 0; r < H[auxF].size() && !ok; ++r) ^ user.cpp:25:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radio2.in","r",stdin); ^ user.cpp:26:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radio2.out","w",stdout); ^ user.cpp:28:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d\n", &n , &m , &l , &k); ^ user.cpp:30:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S + 1); sil = l / ( k + 1 ); ^ user.cpp:60:20: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(A + 1); ^ /tmp/ccekmQHR.o: In function `main': user.cpp:(.text.startup+0x82): warning: the `gets' function is dangerous and should not be used.