Compilare: user.cpp: In function ‘void numu(char (*)[450], int (*)[450], int (*)[450], int, int, int&)’: user.cpp:13:22: warning: unused variable ‘l2’ [-Wunused-variable] int o,o1,i,l1,c1,l2,c2,x,y,ps,pi,k,cif=0,j,big=0; ^ user.cpp:13:25: warning: unused variable ‘c2’ [-Wunused-variable] int o,o1,i,l1,c1,l2,c2,x,y,ps,pi,k,cif=0,j,big=0; ^ user.cpp:13:28: warning: unused variable ‘x’ [-Wunused-variable] int o,o1,i,l1,c1,l2,c2,x,y,ps,pi,k,cif=0,j,big=0; ^ user.cpp:13:30: warning: unused variable ‘y’ [-Wunused-variable] int o,o1,i,l1,c1,l2,c2,x,y,ps,pi,k,cif=0,j,big=0; ^ user.cpp: In function ‘int main()’: user.cpp:61:49: warning: unused variable ‘j’ [-Wunused-variable] int a[450][450]={0},b[450][450]={0},i,p,m,n,j,max; ^ user.cpp:62:22: warning: unused variable ‘l’ [-Wunused-variable] char c[450][450],l; ^ user.cpp:65:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d\n",&p,&m,&n); ^ user.cpp:68:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(c[i],450,f); ^