Compilare: main.cpp: In function 'int main()': main.cpp:17:62: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] a[i][j][k]=max(max(a[i][j][k-1], a[i][j+(1<<k-1)][k-1]), max(a[i+(1<<k-1)][j][k-1], a[i+(1<<k-1)][j+(1<<k-1)][k-1])); ~^~ main.cpp:17:87: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] a[i][j][k]=max(max(a[i][j][k-1], a[i][j+(1<<k-1)][k-1]), max(a[i+(1<<k-1)][j][k-1], a[i+(1<<k-1)][j+(1<<k-1)][k-1])); ~^~ main.cpp:17:110: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] a[i][j][k]=max(max(a[i][j][k-1], a[i][j+(1<<k-1)][k-1]), max(a[i+(1<<k-1)][j][k-1], a[i+(1<<k-1)][j+(1<<k-1)][k-1])); ~^~ main.cpp:17:122: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] a[i][j][k]=max(max(a[i][j][k-1], a[i][j+(1<<k-1)][k-1]), max(a[i+(1<<k-1)][j][k-1], a[i+(1<<k-1)][j+(1<<k-1)][k-1])); ~^~ main.cpp:22:21: warning: suggest parentheses around '+' inside '<<' [-Wparentheses] for(k=0;1<<k+1 <= lg; k++); ~^~