Compilare: user.cpp: In function ‘int main()’: user.cpp:28:31: warning: value computed is not used [-Wunused-value] yy==qy.front(); ^ user.cpp:10:18: warning: unused variable ‘j’ [-Wunused-variable] int N, M, i, j, xx, yy, X, X1, X2, Y, Y1, Y2; ^ user.cpp:29:42: warning: ‘yy’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(a[xx-1][yy]==0 || a[xx-1][yy]>a[xx][yy]+1){a[xx-1][yy]=a[xx][yy]+1; ^