Compilare: user.cpp: In function ‘int main()’: user.cpp:14:31: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] dist[i][j] = 1<<30-1; ^ user.cpp:18:25: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] best[i][j]=1<<30-1; ^ user.cpp:27:30: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if (best[i][j]==1<<31-1) ^