Compilare: user.cpp: In function ‘int main()’: user.cpp:19:18: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, t, d, k, r; ^ user.cpp:19:27: warning: unused variable ‘r’ [-Wunused-variable] int n, i, j, t, d, k, r; ^ user.cpp:16:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("culori.in","r",stdin); ^ user.cpp:17:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("culori.out","w",stdout); ^ user.cpp:21:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^