Compilare: user.cpp: In function ‘void lee()’: user.cpp:9:21: warning: unused variable ‘p’ [-Wunused-variable] int i,j,in,jn,k,p,u,tip,tn; ^ user.cpp:9:23: warning: unused variable ‘u’ [-Wunused-variable] int i,j,in,jn,k,p,u,tip,tn; ^ user.cpp: In function ‘int main()’: user.cpp:55:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("vis.in","r",stdin); ^ user.cpp:56:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("vis.out","w",stdout); ^ user.cpp:57:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i%i%i%i%i%i",&n,&k1,&k2,&l1,&c1,&l2,&c2); ^ user.cpp:60:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i",&a[i][j]); ^