Compilare: user.cpp: In function ‘int main()’: user.cpp:71:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("combinari.in", "r", stdin); ^ user.cpp:72:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("combinari.out", "w", stdout); ^ user.cpp: In function ‘void btc(int)’: user.cpp:56:26: warning: array subscript is below array bounds [-Warray-bounds] { if(k==0)b[k-1]=-1; ^