能量项链

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rogram energy;
{20:02 }
var
a1,a2:array[1..200]of integer;
q:array[1..200,1..200]of longint;
i,j,n,k,m,p:integer;
best:longint;
begin
assign(input,'energy.in');reset(input);
assign(output,'energy.ans');rewrite(output);
readln(n);
for i:=1 to n do read(a1[i]);
readln;
for i:=1 to n-1 do a2[i]:=a1[i+1];
a2[n]:=a1[1];
m:=n*2-1;
for i:=n+1 to m do begin
a1[i]:=a1[i-n];a2[i]:=a2[i-n]
end;
//for i:=1 to m do writeln(a1[i],' ',a2[i],' ');
fillchar(q,sizeof(q),0);
for p:=1 to n-1 do
for i:=1 to m-1 do
begin
j:=i+p;
if j>m then break;
for k:=i to j-1 do begin
if q[i,j]<q[i,k]+q[k+1,j]+a1[i]*a2[k]*a2[j]
then q[i,j]:=q[i,k]+q[k+1,j]+a1[i]*a2[k]*a2[j];
end;
end;
best:=0;
for i:=1 to n do
if best<q[i,i+n-1]then best:=q[i,i+n-1];
writeln(best);
close(input);close(output);
end.

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