Compilare: user.c: In function ‘main’: user.c:7:28: warning: unused variable ‘c2’ [-Wunused-variable] int n,k,i,x,y,l1,c1,l2,c2,pas,fl,p,u,um,m,j; ^ user.c:7:25: warning: unused variable ‘l2’ [-Wunused-variable] int n,k,i,x,y,l1,c1,l2,c2,pas,fl,p,u,um,m,j; ^ user.c:7:22: warning: unused variable ‘c1’ [-Wunused-variable] int n,k,i,x,y,l1,c1,l2,c2,pas,fl,p,u,um,m,j; ^ user.c:7:19: warning: unused variable ‘l1’ [-Wunused-variable] int n,k,i,x,y,l1,c1,l2,c2,pas,fl,p,u,um,m,j; ^ user.c:7:17: warning: unused variable ‘y’ [-Wunused-variable] int n,k,i,x,y,l1,c1,l2,c2,pas,fl,p,u,um,m,j; ^ user.c:7:15: warning: unused variable ‘x’ [-Wunused-variable] int n,k,i,x,y,l1,c1,l2,c2,pas,fl,p,u,um,m,j; ^ user.c:7:11: warning: unused variable ‘k’ [-Wunused-variable] int n,k,i,x,y,l1,c1,l2,c2,pas,fl,p,u,um,m,j; ^ user.c:8:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("pescari.in","r",stdin); ^ user.c:9:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("pescari.out","w",stdout); ^ user.c:10:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&p); ^ user.c:13:18: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&z[i][j]); ^