hdu6110

#include <cstdio>
#include <iostream>
#include <cmath>
#include <cstring>
#include <algorithm>
#include <vector>
#include <queue>
#define fi first
#define se second
using namespace std;
typedef long long LL;
typedef pair<int,int> pii;

struct fastio{
    char s[100005];
    int it,len;
    fastio(){it=len=0;}
    inline char get(){
        if(it<len)return s[it++];it=0;
        len=fread(s,1,100000,stdin);
        if(len==0)return EOF;else return s[it++];
    }
    bool notend(){
        char c=get();
        while(c==' '||c=='\n')c=get();
        if(it>0)it--;
        return c!=EOF;
    }
}BUFF;
#define read(x) x=getnum()
#define write(x) putnum(x),putchar(' ')
#define writeln(x) putnum(x),putchar('\n')

inline LL getnum(){
    LL r=0;bool ng=0;char c;c=BUFF.get();
    while(c!='-'&&(c<'0'||c>'9'))c=BUFF.get();
    if(c=='-')ng=1,c=BUFF.get();
    while(c>='0'&&c<='9')r=r*10+c-'0',c=BUFF.get();
    return ng?-r:r;
}
template<class T> inline void putnum(T x){
    if(x<0)putchar('-'),x=-x;
    register short a[20]={},sz=0;
    while(x)a[sz++]=x%10,x/=10;
    if(sz==0)putchar('0');
    for(int i=sz-1;i>=0;i--)putchar('0'+a[i]);
}
inline char getreal(){char c=BUFF.get();while(c<=32)c=BUFF.get();return c;}


const int MXN = 5e5 + 5;
const int mod = 1e9 + 7;
const int INF = 0x3f3f3f3f;

int n, m, s;
int head[MXN], tot;
int up[MXN][21], dep[MXN], sum[MXN];
struct lp{
    int v, nex, w;
}cw[MXN*3];
void add_1(int a,int b,int c){
    cw[++tot].v=b;cw[tot].nex=head[a];cw[tot].w=c;
    head[a]=tot;
    cw[++tot].v=a;cw[tot].nex=head[b];cw[tot].w=c;
    head[b]=tot;
}
void search(int u,int ba,int d) {
    dep[u] = d;
    up[u][0] = ba;
    for(int i = 1; i < 20; ++i) {
        up[u][i] = up[up[u][i-1]][i-1];
    }
    for(int i = head[u]; ~i; i = cw[i].nex) {
        int v = cw[i].v;
        if(v == ba) continue;
        up[v][0] = u;
        sum[v] = sum[u] + cw[i].w;
        search(v, u, d + 1);
    }
}
int LCA(int x,int y) {
    if(dep[x] < dep[y]) swap(x, y);
    int k = dep[x] - dep[y];
    for(int i = 0; i < 20; ++i) {
        if((1<<i)&k) {
            x = up[x][i];
        }
    }
    if(x == y) return x;
    for(int i = 19; i >= 0; --i) {
        if(up[x][i] != up[y][i]) {
            x = up[x][i];
            y = up[y][i];
        }
    }
    return up[x][0];
}
pair<int,int> tree[MXN<<2];
bool cmp(int a,int b) {
    return dep[a] > dep[b];
}
pii UN(pii x, pii y) {
    int a[4];
    a[0] = LCA(x.fi,y.fi), a[1] = LCA(x.fi,y.se);
    a[2] = LCA(x.se,y.fi), a[3] = LCA(x.se,y.se);
    sort(a, a + 4, cmp);
    return pii(a[0], a[1]);
}
void build(int l,int r,int rt) {
    if(l == r) {
        scanf("%d%d",&tree[rt].fi,&tree[rt].se);
        return;
    }
    int mid=(l+r)>>1;
    build(l,mid,rt<<1);build(mid+1,r,rt<<1|1);
    tree[rt] = UN(tree[rt<<1], tree[rt<<1|1]);
}
pii query(int L,int R,int l,int r,int rt) {
    if(L <= l && r <= R) {
        return tree[rt];
    }
    int mid = (l + r) >> 1;
    if(L > mid) return query(L, R, mid+1, r, rt<<1|1);
    else if(R <= mid) return query(L,R,l,mid,rt<<1);
    return UN(query(L,mid,l,mid,rt<<1),query(mid+1,R,mid+1,r,rt<<1|1));
}
int main(){
    while(~scanf("%d", &n)) {
        for(int i = 1; i <= n; ++i) {
            sum[i] = 0;dep[i] = 0;
            for(int j = 0; j < 20; ++j) up[i][j] = 0;
            head[i] = -1;
        }
        tot = -1;
        for(int i = 1, a, b, c; i < n; ++i) {
            scanf("%d%d%d", &a, &b, &c);
            add_1(a, b,c);
        }
        search(1, 1, 1);
        scanf("%d", &m);
        build(1,m,1);
        scanf("%d", &s);
        for(int tim = 0, l, r; tim < s; ++ tim) {
            scanf("%d%d", &l, &r);
            pii ans = query(l,r,1,m,1);
            printf("%d\n", sum[ans.fi]+sum[ans.se]-2*sum[LCA(ans.fi,ans.se)]);
        }
    }
    return 0;
}