#include <time.h>
#include <cstdlib>
#include <stack>
#include <numeric>
#include <unordered_map>
#include <unordered_set>
#include <iomanip>
#include <map>
#include <set>
#include <iterator>
#include <deque>
#include <queue>
#include <sstream>
#include <array>
#include <string>
#include <tuple>
#include <chrono>
#include <cassert>
#include <cstdio>
#include <cstring>
#include <list>
#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>
#include <bitset>
#define ll long long
using namespace std;
int tt = 1, n, m, q;
vector<int> g[200005];
ll p[100005], c[100005], s[100005], t[100005], x[100005], y[100005], h[100005], pp[100005];
pair<ll, ll> mn[1000005];
vector<ll> v;
map<pair<int, int>, int> mp;
int kol[100005];
void dfs(int k, int pr){
v.push_back(k);
pp[k] = pr;
kol[k] += (ss[mp[{k, pr}]].size());
for(int to : g[k]){
if(to == pr) continue;
h[to] = h[k] + 1;
kol[to] += kol[k];
dfs(to, k);
v.push_back(k);
}
}
void up(int l, int r, int pos, int num, int ind, int vv){
if(l > pos || r < pos) return;
if(l == r){
mn[vv] = {num, ind};
return;
}
int mid = (l + r) / 2;
up(l, mid, pos, num, ind, vv * 2);
up(mid + 1, r, pos, num, ind, vv * 2 + 1);
mn[vv] = min(mn[vv * 2], mn[vv * 2 + 1]);
}
pair<int, int> sbor(int l, int r, int l1, int r1, int vv){
if(l > r1 || l1 > r) return {1e9, 1e9};
if(l >= l1 && r1 >= r) return mn[vv];
int mid = (l + r) / 2;
return min(sbor(l, mid, l1, r1, vv * 2), sbor(mid + 1, r, l1, r1, vv * 2 + 1));
}
vector<ll> ss[100005];
int lf[1000005];
set<int> st;
int main(){
ios::sync_with_stdio(0);
cin.tie(0), cout.tie(0);
cin >> n >> m >> q;
for(int i = 1; i < n; i++){
int a, b;
cin >> a >> b;
g[a].push_back(b);
g[b].push_back(a);
mp[{a, b}] = i;
mp[{b, a}] = i;
}
for(int i = 1; i <= m; i++){
cin >> p[i] >> c[i];
ss[p[i]].push_back(c[i]);
st.insert(s[i]);
}
for(int i = 1; i <= q; i++)
cin >> s[i] >> t[i] >> x[i] >> y[i];
v.push_back(1);
dfs(1, 0);
for(int i = 1; i < int(v.size()); i++){
up(1, int(v.size()) - 1, i, h[v[i]], v[i], 1);
if(lf[v[i]] == 0) lf[v[i]] = i;
}
int d = v.size();
for(int i = 1; i <= q; i++){
int l = min(lf[s[i]], lf[t[i]]);
int r = max(lf[s[i]], lf[t[i]]);
auto it = sbor(1, d - 1, l, r, 1);
int lca = it.second;
if(int(st.size()) == 1){
ll dist = kol[s[i]] - kol[lca] + kol[t[i]] - kol[lca];
ll ost = x[i] - max(0ll, dist - y[i] / c[1]);
if(ost < 0) cout << -1 << "\n";
else cout << ost << "\n";
continue;
}
vector<ll> vv;
l = s[i], r = t[i];
while(l != lca){
for(ll to : ss[mp[{l, pp[l]}]])
vv.push_back(to);
l = pp[l];
}
while(r != lca){
for(ll to : ss[mp[{r, pp[r]}]])
vv.push_back(to);
r = pp[r];
}
sort(vv.rbegin(), vv.rend());
while(!vv.empty()){
if(y[i] >= vv.back()){
y[i] -= vv.back();
vv.pop_back();
}
else break;
}
x[i] -= int(vv.size());
if(x[i] < 0) cout << -1 << "\n";
else cout << x[i] << "\n";
}
}
Compilation message
currencies.cpp: In function 'void dfs(int, int)':
currencies.cpp:40:16: error: 'ss' was not declared in this scope; did you mean 's'?
40 | kol[k] += (ss[mp[{k, pr}]].size());
| ^~
| s
