Compilare: user.cpp: In function ‘int main()’: user.cpp:30:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, s, t, d, k, x, y; ^ user.cpp:30:18: warning: unused variable ‘s’ [-Wunused-variable] int n, i, j, s, t, d, k, x, y; ^ user.cpp:30:24: warning: unused variable ‘d’ [-Wunused-variable] int n, i, j, s, t, d, k, x, y; ^ user.cpp:30:27: warning: unused variable ‘k’ [-Wunused-variable] int n, i, j, s, t, d, k, x, y; ^ user.cpp:27:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("densitate.in","r",stdin); ^ user.cpp:28:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("densitate.out","w",stdout); ^ user.cpp:32:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&t); ^ user.cpp:36:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^