Compilare: user.cpp: In function ‘long long int pinex(int, int)’: user.cpp:16:32: warning: unused variable ‘nr’ [-Wunused-variable] int ns = (1 << nrdiv) - 1, nr, i, j; ^ user.cpp:16:39: warning: unused variable ‘j’ [-Wunused-variable] int ns = (1 << nrdiv) - 1, nr, i, j; ^ user.cpp:17:24: warning: variable ‘cm’ set but not used [-Wunused-but-set-variable] long long ans = 0, cm; ^ user.cpp: In function ‘int main()’: user.cpp:26:18: warning: unused variable ‘x’ [-Wunused-variable] int n, k, i, x; ^ user.cpp:27:15: warning: unused variable ‘cm’ [-Wunused-variable] long long cm = 1; ^ user.cpp:24:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suman.in", "r", stdin); ^ user.cpp:25:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suman.out", "w", stdout); ^ user.cpp:28:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp:30:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^