Compilare: user.cpp: In function ‘int main()’: user.cpp:13:13: warning: unused variable ‘l’ [-Wunused-variable] int i,j,l,c,x,y; ^ user.cpp:13:15: warning: unused variable ‘c’ [-Wunused-variable] int i,j,l,c,x,y; ^ user.cpp:13:17: warning: unused variable ‘x’ [-Wunused-variable] int i,j,l,c,x,y; ^ user.cpp:13:19: warning: unused variable ‘y’ [-Wunused-variable] int i,j,l,c,x,y; ^ user.cpp:14:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("luna.in","r",stdin); ^ user.cpp:15:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("luna.out","w",stdout); ^ user.cpp:16:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:19:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^ user.cpp:36:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ user.cpp:39:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&type,&l1,&l2); ^