Compilare: user.cpp: In function ‘int main()’: user.cpp:24:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[i]+a[i1]+a[j]+a[j1]+a[k]+a[k1]==s){ ^ user.cpp:13:11: warning: unused variable ‘pow’ [-Wunused-variable] ll s, pow; ^ user.cpp:11:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("loto.in", "r", stdin); ^ user.cpp:12:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("loto.out", "w", stdout); ^ user.cpp:15:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %llu", &n, &s); ^ user.cpp:16:40: 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", &a[i]); ^