Compilare: user.cpp: In function ‘void bck(int, int)’: user.cpp:22:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fct[i][viz | (1<<(i-1))]==-1) ^ user.cpp:24:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] re=re+fct[i][viz | (1<<(i-1))]; ^ user.cpp: In function ‘int main()’: user.cpp:42:37: 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:43:39: 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:46:27: 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:50:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^