「HNOI2015」开店(树链剖分， 主席树）

/*
考虑将所求的值拆分
记每个点到根的路径长度为dis_i， 那么我们要求的就是\sum_{i = l} ^ r dis_i + dis[u] * (r - l + 1)
- 2\sum_{i = l} ^ r dis_{LCA(i, u)}
前两个前缀和处理
对于第三个可以转换成一个经典问题， 就是对于每个点到根的路径  + 1, 那么第三个东西就是这个点到根的贡献和了 
*/
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<queue>
#include<iostream>
#define ll long long
#define mmp make_pair
#define M 200010
using namespace std;
int read()
{
	int nm = 0, f = 1;
	char c = getchar();
	for(; !isdigit(c); c = getchar()) if(c == '-') f = -1;
	for(; isdigit(c); c = getchar()) nm = nm * 10 + c - '0';
	return nm * f;
}
int n, q, A, sz[M], son[M], fa[M], top[M], dfn[M], dft, ver[M], cnt;
ll dis[M], ans, sum[M], w[M];
pair<int, int> sta[M];
vector<pair<int, int> > to[M];
int lc[10001000], rc[10001000], v[10001000], rt[M];
ll t[10001000];
void dfs(int now, int f)
{
	sz[now] = 1;
	fa[now] = f;
	for(int i = 0; i < to[now].size(); i++)
	{
		int vj = to[now][i].first, v = to[now][i].second;
		if(vj == f) continue;
		dis[vj] = dis[now] + v;
		ver[vj] = v;
		dfs(vj, now);
		if(sz[vj] > sz[son[now]]) son[now] = vj;
		sz[now] += sz[vj];
	}
}
void dfs(int now)
{
	dfn[now] = ++dft;
	w[dfn[now]] = ver[now];
	if(son[now])
	{
		top[son[now]] = top[now];
		dfs(son[now]);
	}
	for(int i = 0; i < to[now].size(); i++)
	{
		int vj = to[now][i].first;
		if(vj == fa[now] || vj == son[now]) continue;
		top[vj] = vj;
		dfs(vj);
	}
}
void modify(int last, int &now, int l, int r, int ln, int rn)
{
	now = ++cnt;
	lc[now] = lc[last], rc[now] = rc[last], t[now] = t[last], v[now] = v[last];
	if(l == ln && r == rn)
	{
		v[now]++;
		return;
	}
	t[now] += w[rn] - w[ln - 1];
	int mid = (l + r) >> 1;
	if(ln > mid) modify(rc[last], rc[now], mid + 1, r, ln, rn);
	else if(rn <= mid) modify(lc[last], lc[now], l, mid, ln, rn);
	else modify(lc[last], lc[now], l, mid, ln, mid), modify(rc[last], rc[now], mid + 1, r, mid + 1, rn);
}
ll query(int now, int l, int r, int ln, int rn)
{
	ll ans = 1ll * (w[rn] - w[ln - 1]) * v[now];
	if(l == ln && r <= rn) return ans + t[now];
	int mid = (l + r) >> 1;
	if(rn <= mid) return ans + query(lc[now], l, mid, ln, rn);
	else if(ln > mid) return ans + query(rc[now], mid + 1, r, ln, rn);
	else return ans + query(lc[now], l, mid, ln, mid) + query(rc[now], mid + 1, r, mid + 1, rn);
}
void Modify(int &now, int x)
{
	for(; top[x] != 1; x = fa[top[x]]) modify(now, now, 1, n, dfn[top[x]], dfn[x]);
	modify(now, now, 1, n, dfn[1], dfn[x]);
}
ll Query(int now, int x)
{
	ll ans = 0;
	for(; top[x] != 1; x = fa[top[x]]) ans += query(now, 1, n, dfn[top[x]], dfn[x]);
	ans += query(now, 1, n, dfn[1], dfn[x]);
	return ans;
}
int main()
{
	n = read(), q = read(), A = read();
	for(int i = 1; i <= n; i++) sta[i] = mmp(read(), i);
	sort(sta + 1, sta + n + 1);
	for(int i = 1; i < n; i++)
	{
		int vi = read(), vj = read(), v = read();
		to[vi].push_back(mmp(vj, v));
		to[vj].push_back(mmp(vi, v));
	}
	dfs(1, 0);
	top[1] = 1;
	dfs(1);
	for(int i = 1; i <= n; i++) sum[i] = sum[i - 1] + dis[sta[i].second], w[i] += w[i - 1];
	for(int i = 1; i <= n; i++) rt[i] = rt[i - 1], Modify(rt[i], sta[i].second);
	while(q--)
	{
		int u = read(), l = read(), r = read();
		l = (ans + l) % A, r = (ans + r) % A;
		if(r < l) swap(l, r);
		ans = 0;
		l = lower_bound(sta + 1, sta + n + 1, mmp(l, 0)) - sta,
		r = lower_bound(sta + 1, sta + n + 1, mmp(r, 0x3e3e3e3e)) - sta - 1;
		ans += Query(rt[l - 1], u);
		ans -= Query(rt[r], u);
		ans *= 2;
		ans += 1ll * (r - l + 1) * dis[u];
		ans += sum[r] - sum[l - 1];
		cout << ans << "\n";
	}
	return 0;
}