Compilare: user.cpp: In function ‘int main()’: user.cpp:24:20: warning: unused variable ‘s’ [-Wunused-variable] ll n, i, j, k, s, t, d; ^ user.cpp:24:23: warning: unused variable ‘t’ [-Wunused-variable] ll n, i, j, k, s, t, d; ^ user.cpp:24:26: warning: unused variable ‘d’ [-Wunused-variable] ll n, i, j, k, s, t, d; ^ user.cpp:21:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("redu.in","r",stdin); ^ user.cpp:22:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("redu.out","w",stdout); ^ user.cpp:27:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",q+1); ^ user.cpp:28:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] ^ user.cpp:31:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] } ^