Compilare: user.cpp: In function ‘int main()’: user.cpp:37:30: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] v4=d[k-1][i+(1<<k-1)][j+(1<<k-1)]; ^ user.cpp:37:42: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] v4=d[k-1][i+(1<<k-1)][j+(1<<k-1)]; ^