#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<ll, ll> pii;
typedef pair<ld, ld> pld;
vector<pii> v1;
vector<pii> v2;
struct vertex{
ll left, right;
ll maxi = 0, lazy = 0, sz = 0;
vertex *lchild = nullptr, *rchild = nullptr;
vertex(){}
vertex(ll lb, ll rb){
left = lb;
right = rb;
}
void push(){
if(lchild){
lchild->lazy += lazy;
lchild->maxi += lazy;
}
if(rchild){
rchild->lazy += lazy;
rchild->maxi += lazy;
}
lazy = 0;
}
void pull(){
maxi = 0;
if(lchild)
maxi = max(maxi, lchild->maxi);
if(rchild)
maxi = max(maxi, rchild->maxi);
}
void add(ll idx, ll val){
++sz;
if(left == idx && right == idx){
maxi = max(maxi, val);
return;
}
push();
if(idx <= (left+right)/2){
if(!lchild)
lchild = new vertex(left, (left+right)/2);
lchild->add(idx, val);
}
else{
if(!rchild)
rchild = new vertex((left+right)/2+1, right);
rchild->add(idx, val);
}
pull();
}
void upd(ll l, ll r, ll val){
if(right < l || r < left)
return;
if(l <= left && right <= r){
maxi += val;
lazy += val;
return;
}
push();
if(lchild)
lchild->upd(l, r, val);
if(rchild)
rchild->upd(l, r, val);
pull();
}
ll get(ll l, ll r){
if(right < l || r < left)
return 0;
if(l <= left && right <= r){
return maxi;
}
push();
ll ret = 0;
if(lchild)
ret = max(ret, lchild->get(l, r));
if(rchild)
ret = max(ret, rchild->get(l, r));
return ret;
}
void dfs(){
if(left == right){
v1.pb({left, maxi});
if(v2.empty() || maxi > v2.back().ss)
v2.pb({left, maxi});
return;
}
push();
if(lchild)
lchild->dfs();
if(rchild)
rchild->dfs();
delete lchild;
delete rchild;
}
};
vector<ll> g[100009];
ll n, m, k;
pii val[100009];
void merge(vertex &a, vertex &b){
if(b.sz > a.sz)
swap(a, b);
v1.clear();
v2.clear();
b.dfs();
for(auto &u : v1){
u.ss += a.get(1, u.ff);
}
for(ll i = 0; i < v2.size(); ++i){
ll val;
if(i == 0)
val = v2[i].ss;
else
val = v2[i].ss-v2[i-1].ss;
a.upd(v2[i].ff, k, val);
}
for(auto u : v1){
a.add(u.ff, u.ss);
}
//cout << '\n';
}
vertex seg[100009];
void dfs(ll v){
seg[v] = vertex(1, k);
for(auto u : g[v]){
dfs(u);
merge(seg[v], seg[u]);
}
if(val[v].ff){
seg[v].add(val[v].ff, val[v].ss+seg[v].get(1, val[v].ff));
}
}
ll main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
//freopen("in.txt", "r", stdin);
//freopen("out.txt", "w", stdout);
cin >> n >> m >> k;
for(ll i = 2; i <= n; ++i){
ll p;
cin >> p;
g[p].pb(i);
}
for(ll i = 0; i < m; ++i){
ll v, d, w;
cin >> v >> d >> w;
val[v] = {d, w};
}
dfs(1);
cout << seg[1].maxi << '\n';
}
Compilation message
magictree.cpp: In function 'void merge(vertex&, vertex&)':
magictree.cpp:120:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
120 | for(ll i = 0; i < v2.size(); ++i){
| ~~^~~~~~~~~~~
magictree.cpp: At global scope:
magictree.cpp:145:1: error: '::main' must return 'int'
145 | ll main() {
| ^~
