Compilare: user.cpp: In function ‘int main()’: user.cpp:21:47: warning: operation on ‘k’ may be undefined [-Wsequence-point] v[++k] = (v[k - 1] + v[k - 2]) % R; ^ user.cpp:21:47: warning: operation on ‘k’ may be undefined [-Wsequence-point] user.cpp:9:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("melodii.in","r",stdin); ^ user.cpp:10:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("melodii.out","w",stdout); ^ user.cpp:12:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &R); ^ user.cpp:27:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &X); ^