Compilare: user.cpp: In function ‘int main()’: user.cpp:31:55: warning: operation on ‘k’ may be undefined [-Wsequence-point] S[++k] = ((S[k-1] << 1) + G[S[k-1]]) % LN; ^ user.cpp:31:55: warning: operation on ‘k’ may be undefined [-Wsequence-point] user.cpp:9:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biti.in","r",stdin); ^ user.cpp:10:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biti.out","w",stdout); ^ user.cpp:12:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^