Compilare: user.cpp: In function ‘void bck(int)’: user.cpp:16:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(((viz & (1<<(i-1)))==0) && ((viz & fii[i])==fii[i])) ^ user.cpp:16:63: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(((viz & (1<<(i-1)))==0) && ((viz & fii[i])==fii[i])) ^ user.cpp: In function ‘int main()’: user.cpp:34:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teroristi2.in","r",stdin); ^ user.cpp:35:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teroristi2.out","w",stdout); ^ user.cpp:38:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&k,&r); ^ user.cpp:42:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^