public void Solve()
{
// AGC005 B
int N = NextInt();
var A = NextIntList();
var index = new Map <int, int>();
A.ForeachWith((idx, item) =>
{
index[item - 1] = idx;
});
var suf = new SectionUnionFind(N);
var ans = 0L;
for (int i = N - 1; i >= 0; i--)
{
var k = index[i];
ans += A[k];
if (k - 1 >= 0 && A[k - 1] > A[k])
{
//???????????????Unite
ans += (long)suf.Unite(k - 1, k) * A[k];
}
if (k + 1 < N && A[k + 1] > A[k])
{
//???????????????Unite
ans += (long)suf.Unite(k + 1, k) * A[k];
}
}
ans.WL();
return;
}
public void Solve()
{
var N = NextInt();
long[] a = new long[N], aindex = new long[N];
N.REP(i =>
{
a[i] = NextLong();
aindex[a[i] - 1] = i;
});
var suf = new SectionUnionFind(N);
var ans = 0L;
for (var k = N - 1; k >= 0; k--)
{
var i = (int)aindex[k];
ans += a[i];
if (i - 1 >= 0 && a[i - 1] > a[i])
{
ans += suf.Unite(i - 1, i) * a[i];
}
if (i + 1 < N && a[i + 1] > a[i])
{
ans += suf.Unite(i + 1, i) * a[i];
}
}
ans.WL();
}
public void Solve()
{
// AGC005 B
var N = NextInt();
var A = NextLongList();
//Root??????????Union-Find???
var suf = new SectionUnionFind(N);
var pos = new int[N];
for (int i = 0; i < N; i++)
{
pos[A[i] - 1] = i;
}
var ans = 0L;
for (int i = N - 1; i >= 0; i--)
{
var idx = pos[i];
ans += A[idx];
//???idx??????????????
if (idx - 1 >= 0 && A[idx - 1] > A[idx])
{
ans += suf.Unite(idx, idx - 1) * A[idx];
}
if (idx + 1 < N && A[idx + 1] > A[idx])
{
ans += suf.Unite(idx, idx + 1) * A[idx];
}
}
ans.WL();
return;
}
