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| #include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>
#include <queue>
#define REP(i,k,n) for(int i=k;i<n;i++)
#define rep(i,n) for(int i=0;i<n;i++)
#define INF 1LL<<61
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
struct edge {
int from,to;
ll cost;
edge(int t,ll c) : to(t),cost(c) {}
edge(int f,int t,ll c) : from(f),to(t),cost(c) {}
bool operator<(const edge &e) const {
return cost < e.cost;
}
};
vector<edge> G[100005];
ll d[100005], d2[100005];
void dijkstra(int s, int n) {
priority_queue<pair<ll, ll> , vector<pair<ll, ll> >, greater<pair<ll, ll> > > que;
fill(d, d+n, INF);
d[s] = 0;
que.push(P(0,s));
while(que.size()) {
P p = que.top();
que.pop();
int v = p.second;
if(d[v] < p.first) continue;
rep(i, G[v].size()) {
edge e = G[v][i];
if(d[e.to] > d[v] + e.cost) {
d[e.to] = d[v] + e.cost;
que.push(P(d[e.to],e.to));
}
}
}
}
struct BIT {
vector<int> bit;
BIT(int n) : bit(n+1) {}
int sum(int i) {
int s = 0;
while(i > 0) {
s += bit[i];
i -= i & -i;
}
return s;
}
void add(int i,int x) {
while(i <= bit.size()) {
bit[i] += x;
i += i & -i;
}
}
};
int main() {
int n, m;
cin >> n >> m;
rep(i, m) {
ll a, b, c;
cin >> a >> b >> c;
G[a].push_back(edge(b, c));
G[b].push_back(edge(a, c));
}
dijkstra(n-1, n);
memset(d2, 0, sizeof(d2));
rep(i, n) {
d2[i] = d[i];
}
dijkstra(0, n);
vector<ll> d3(n);
vector<pair<ll, int> > D, D2;
rep(i, n) {
d3[i] = d[i];
D.push_back(mp(d[i], i));
D2.push_back(mp(d2[i], i));
}
sort(d3.begin(), d3.end());
sort(D.begin(), D.end());
sort(D2.begin(), D2.end());
map<int, int> ma;
rep(i, n) {
ma[ D[i].second ] = i;
}
int q;
cin >> q;
vector<pair<pair<ll, ll> , int> > query(q);
rep(i, q) {
ll s, g;
cin >> s >> g;
query[i] = mp(mp(g, s), i);
}
sort(query.begin(), query.end());
BIT bit(n + 5);
vector<P> ans;
int start = 0;
rep(i, q) {
ll s = query[i].first.second;
ll g = query[i].first.first;
int id = query[i].second;
for(; start < n; start++) {
if(g > D2[start].first) {
int k = ma[ D2[start].second ];
bit.add(k + 1, 1);
continue;
} else break;
}
vector<ll>::iterator ite = upper_bound(d3.begin(), d3.end(), s);
int k = ite - d3.begin() - 1;
if(k < 0) {
ans.push_back(mp( id, 0));
} else {
int res = k + 1;
res -= bit.sum(k + 1);
ans.push_back(mp( id, res));
}
}
sort(ans.begin(), ans.end());
rep(i, ans.size()) {
cout << ans[i].second << endl;
}
return 0;
}
|