Compilare: main.cpp: In function 'int main()': main.cpp:23:9: warning: unused variable 'dx' [-Wunused-variable] int dx[4]={0,1,0,-1},dy[4]={-1,0,1,0}; ^~ main.cpp:23:26: warning: unused variable 'dy' [-Wunused-variable] int dx[4]={0,1,0,-1},dy[4]={-1,0,1,0}; ^~ main.cpp:26:33: warning: variable 'ka' set but not used [-Wunused-but-set-variable] int v[n][m],o[n+2][m+2]={0},ka[n][m]; ^~