Compilare: user.cpp: In function ‘void cauta(int, int, int)’: user.cpp:101:9: warning: unused variable ‘i’ [-Wunused-variable] int i,ans=VMAX,di=VMAX,dj=VMAX,pi,pj,val,dir,j,dir2,ans2,di2,dj2,x; ^ user.cpp:101:52: warning: unused variable ‘dir2’ [-Wunused-variable] int i,ans=VMAX,di=VMAX,dj=VMAX,pi,pj,val,dir,j,dir2,ans2,di2,dj2,x; ^ user.cpp:101:57: warning: unused variable ‘ans2’ [-Wunused-variable] int i,ans=VMAX,di=VMAX,dj=VMAX,pi,pj,val,dir,j,dir2,ans2,di2,dj2,x; ^ user.cpp:101:62: warning: unused variable ‘di2’ [-Wunused-variable] int i,ans=VMAX,di=VMAX,dj=VMAX,pi,pj,val,dir,j,dir2,ans2,di2,dj2,x; ^ user.cpp:101:66: warning: unused variable ‘dj2’ [-Wunused-variable] int i,ans=VMAX,di=VMAX,dj=VMAX,pi,pj,val,dir,j,dir2,ans2,di2,dj2,x; ^ user.cpp:101:70: warning: unused variable ‘x’ [-Wunused-variable] int i,ans=VMAX,di=VMAX,dj=VMAX,pi,pj,val,dir,j,dir2,ans2,di2,dj2,x; ^ user.cpp: In function ‘int main()’: 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("spider.in","r",stdin); ^ user.cpp:17:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:32:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^ user.cpp: In function ‘void cauta(int, int, int)’: user.cpp:101:46: warning: ‘dir’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i,ans=VMAX,di=VMAX,dj=VMAX,pi,pj,val,dir,j,dir2,ans2,di2,dj2,x; ^