Compilare: user.cpp: In function ‘void solve()’: user.cpp:55:13: warning: unused variable ‘semn’ [-Wunused-variable] int semn = ((x-i)%2 ? -1 : 1), term; ^ user.cpp: In function ‘int main()’: user.cpp:74:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xnumere.in", "r", stdin); ^ user.cpp:75:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xnumere.out", "w", stdout); ^ user.cpp:77:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %d %lld", &k, &x, &n); ^