Compilare: user.cpp: In function ‘void lee(int, int, int)’: user.cpp:14:15: warning: unused variable ‘t’ [-Wunused-variable] int i, s, t, d, k, x_aa, y_aa; ^ user.cpp:14:21: warning: unused variable ‘k’ [-Wunused-variable] int i, s, t, d, k, x_aa, y_aa; ^ user.cpp: In function ‘int main()’: user.cpp:46:21: warning: unused variable ‘s’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x1, x2, x11, x12; ^ user.cpp:46:24: warning: unused variable ‘t’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x1, x2, x11, x12; ^ user.cpp:46:27: warning: unused variable ‘d’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x1, x2, x11, x12; ^ user.cpp:46:30: warning: unused variable ‘k’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x1, x2, x11, x12; ^ user.cpp:42:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alee.in","r",stdin); ^ user.cpp:43:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alee.out","w",stdout); ^ user.cpp:50:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:56:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x1,&x2); ^ user.cpp:60:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&x1,&x2,&x11,&x12); ^