Compilare: user.cpp: In function ‘int main()’: user.cpp:15:18: warning: unused variable ‘j’ [-Wunused-variable] int n, k, i, j, s, t, d, st, dr; ^ user.cpp:15:24: warning: unused variable ‘t’ [-Wunused-variable] int n, k, i, j, s, t, d, st, dr; ^ user.cpp:15:27: warning: unused variable ‘d’ [-Wunused-variable] int n, k, i, j, s, t, d, st, dr; ^ user.cpp:11:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("deque.in","r",stdin); ^ user.cpp:12:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("deque.out","w",stdout); ^ user.cpp:18:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:19:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for( i = 1; i <= n; ++i ) scanf("%d",&v[i]); ^