Submission #934274

#	Time	Username	Problem	Language	Result	Execution time	Memory
934274		tamir1	Magic Tree (CEOI19_magictree)	C++14	100 / 100	84 ms	29332 KiB

magictree

#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll n,m,k,i,day[100005],x[100005],node,d,w,p[100005],ans;
vector<ll> v[100005];
map<ll,ll> mp;
void dfs(ll a){
	map<ll,ll> mp2;
	for(ll i:v[a]){
		dfs(i);
		if(mp2.size()<mp.size()) swap(mp2,mp);
		for(auto [p,q]:mp){
			mp2[p]+=q;
		}
	}
	if(day[a]>0){
		mp2[day[a]]+=x[a];
		while(true){
			auto it=mp2.upper_bound(day[a]);
			if(it==mp2.end()) break;
			if(it->second<=x[a]){
				x[a]-=it->second;
				mp2.erase(it);
				continue;
			}
			it->second-=x[a];
			break;
		}
	}
	swap(mp2,mp);
}
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> n >> m >> k;
	for(i=2;i<=n;i++){
		cin >> p[i];
		v[p[i]].push_back(i);
	}
	for(i=1;i<=m;i++){
		cin >> node >> d >> w;
		day[node]=d;
		x[node]=w;
	}
	dfs(1);
	for(auto [a,b]:mp) ans+=b;
	cout << ans;
}

Compilation message (stderr)

magictree.cpp: In function 'void dfs(long long int)':
magictree.cpp:12:12: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   12 |   for(auto [p,q]:mp){
      |            ^
magictree.cpp: In function 'int main()':
magictree.cpp:47:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   47 |  for(auto [a,b]:mp) ans+=b;
      |           ^

• Subtask 1: 6 / 6
• Subtask 2: 3 / 3
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12
• Subtask 5: 16 / 16
• Subtask 6: 13 / 13
• Subtask 7: 22 / 22
• Subtask 8: 17 / 17