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답안 #383764

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
383764 2021-03-30T19:25:37 Z rqi Designated Cities (JOI19_designated_cities) C++14
56 / 100
 2000 ms 47744 KB 
#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
 
typedef vector<int> vi;
typedef vector<ll> vl;
 
#define f first
#define s second
#define mp make_pair
#define pb push_back
 
#define sz(x) (int)(x).size()
 
void ckmax(ll&a, ll b){
	a = max(a, b);
}
 
const int mx = 200005;
int N;
int A[mx];
int B[mx];
ll C[mx];
ll D[mx];
int E[mx];
 
vector<pair<int, ll>> adj[mx];
ll tot_cost;
ll ans[mx];
 
int sub[mx];
vi cen_nodes;
 
void genSub(int node, int p = -1){
	cen_nodes.pb(node);
	sub[node] = 1;
	for(auto u: adj[node]){
		if(u.f == p) continue;
		genSub(u.f, node);
		sub[node]+=sub[u.f];
	}
}
 
int getCen(int node, int tot_sz, int p = -1){
	for(auto u: adj[node]){
		if(u.f == p) continue;
		if(sub[u.f] > tot_sz/2) return getCen(u.f, tot_sz, node);
	}
	return node;
}
 
 
 
int genCen(int node){
	cen_nodes.clear();
	genSub(node);
	return getCen(node, sub[node]);
}
 
pair<int, ll> par[mx];
ll sum_up[mx];
pair<ll, int> best_down[mx];
 
void genUpDown(int node, int p = -1){
	sum_up[node] = 0;
	best_down[node] = mp(0, node);
 
	for(auto u: adj[node]){
		if(u.f == p) continue;
		ll bedge = 0;
		for(auto x: adj[u.f]){
			if(x.f == node){
				bedge = x.s;
				break;
			}
		}
		par[u.f] = mp(node, u.s);
		sum_up[node]+=bedge;
		genUpDown(u.f, node);
		sum_up[node]+=sum_up[u.f];
		best_down[node] = max(best_down[node], mp(best_down[u.f].f+u.s, best_down[u.f].s));
	}
}
 
bool taken[mx];
 
void genAns(int cen, ll offset){
	cen = genCen(cen);
 
	//process cen
 
	genUpDown(cen);
 
	//update ans - remember done/offset
 
	//cout << "cen, offset, sumup[cen]: " << cen << " " << offset << " " << sum_up[cen] << "\n";
 
	ckmax(ans[1], sum_up[cen]+offset);
 
	queue<int> q;
	for(auto u: adj[cen]){
		q.push(best_down[u.f].s);
	}
 
	for(auto u: cen_nodes){
		taken[u] = 0;
	}
	taken[cen] = 1;
 
	vl sums;

	while(sz(q)){
		int take_node = q.front();
		q.pop();
 
		//cout << "take_node: " << i << " " << take_node << "\n";
		ll sum = 0;
		while(true){
			sum+=par[take_node].s;
			taken[take_node] = 1;
			//cout << "add: " << take_node << " " << par[take_node].s << "\n";
			for(auto u: adj[take_node]){
				if(taken[u.f] || u.f == par[take_node].f) continue;
				q.push(best_down[u.f].s);
				//cout << "push: " << best_down[u.f].s << "\n";
			}
			if(taken[par[take_node].f]) break;
			take_node = par[take_node].f;
		}
		sums.pb(sum);
	}

	ll val1 = 0;
	ll val2 = 0;

	for(auto u: adj[cen]){
		ckmax(val2, best_down[u.f].f+par[u.f].s);
		if(val1 < val2){
			swap(val1, val2);
		}
	}

	sort(sums.rbegin(), sums.rend());
	// cout << "sums: ";
	// for(auto u: sums){
	// 	cout << u << " ";
	// }
	// cout << "\n";

	//cout << "vals: " << val1 << " " << val2 << "\n";

	ll cur_sum = 0;
	for(int i = 1; i <= sz(cen_nodes); i++){
		if(i-1 >= sz(sums)){
			ckmax(ans[i], cur_sum+offset+sum_up[cen]);
			continue;
		}
		cur_sum+=sums[i-1];

		if(i == 1) continue;

		if(sums[i-1] > val2){
			//cout << i+1 << " " << cur_sum+val2+offset+sum_up[cen] << "\n";
			ckmax(ans[i+1], cur_sum+val2+offset+sum_up[cen]);
		}
		else{
			ckmax(ans[i], cur_sum+offset+sum_up[cen]);
		}
	}

 
	//recurse
	for(auto u: adj[cen]){
		ll new_offset = offset+sum_up[cen]-sum_up[u.f]+u.s;
		vector<pair<int, ll>> v;
		for(auto x: adj[u.f]){
			if(x.f == cen){
				new_offset-=x.s;
				continue;
			}
			v.pb(x);
		}
		adj[u.f] = v;
		genAns(u.f, new_offset);
	}
}
 
int main(){
	cin >> N;
	for(int i = 1; i <= N-1; i++){
		cin >> A[i] >> B[i] >> C[i] >> D[i];
		adj[A[i]].pb(mp(B[i], C[i]));
		adj[B[i]].pb(mp(A[i], D[i]));
		tot_cost+=C[i]+D[i];
	}
 
	genAns(1, 0);
 
	// cout << "tot: " << tot_cost << "\n";
	// for(int i = 1; i <= N; i++){
	// 	cout << "i, ans[i]: " << i << " " << ans[i] << "\n";
	// }
 
	for(int i = 1; i <= N; i++){
		ans[i] = tot_cost-ans[i];
	}
 
	//cout << ans[N] << "\n";
 
	assert(ans[N] == 0);
 
	int Q;
	cin >> Q;
	for(int i = 1; i <= Q; i++){
		cin >> E[i];
		cout << ans[E[i]] << "\n";
	}
}

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 4 ms 5100 KB Output is correct
5 Correct 4 ms 5100 KB Output is correct
6 Correct 4 ms 5100 KB Output is correct
7 Correct 4 ms 5100 KB Output is correct
8 Correct 4 ms 5100 KB Output is correct
9 Correct 4 ms 5100 KB Output is correct
10 Correct 4 ms 5100 KB Output is correct
11 Correct 4 ms 5100 KB Output is correct

Subtask #2
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 1084 ms 32688 KB Output is correct
3 Correct 1429 ms 41672 KB Output is correct
4 Correct 1084 ms 32816 KB Output is correct
5 Correct 604 ms 32356 KB Output is correct
6 Correct 1362 ms 34308 KB Output is correct
7 Correct 571 ms 33116 KB Output is correct
8 Correct 1478 ms 42208 KB Output is correct
9 Correct 477 ms 34772 KB Output is correct

Subtask #3
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 1160 ms 32880 KB Output is correct
3 Correct 1455 ms 43492 KB Output is correct
4 Correct 1097 ms 32668 KB Output is correct
5 Correct 605 ms 32152 KB Output is correct
6 Correct 1378 ms 34692 KB Output is correct
7 Correct 482 ms 34644 KB Output is correct
8 Correct 1460 ms 39332 KB Output is correct
9 Correct 476 ms 34772 KB Output is correct

Subtask #4
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 4 ms 5100 KB Output is correct
5 Correct 4 ms 5100 KB Output is correct
6 Correct 4 ms 5100 KB Output is correct
7 Correct 4 ms 5100 KB Output is correct
8 Correct 4 ms 5100 KB Output is correct
9 Correct 4 ms 5100 KB Output is correct
10 Correct 4 ms 5100 KB Output is correct
11 Correct 4 ms 5100 KB Output is correct
12 Correct 4 ms 5100 KB Output is correct
13 Correct 14 ms 5356 KB Output is correct
14 Correct 14 ms 5484 KB Output is correct
15 Correct 14 ms 5356 KB Output is correct
16 Correct 14 ms 5356 KB Output is correct
17 Correct 14 ms 5356 KB Output is correct
18 Correct 14 ms 5356 KB Output is correct
19 Correct 17 ms 5356 KB Output is correct
20 Correct 13 ms 5356 KB Output is correct
21 Correct 15 ms 5356 KB Output is correct
22 Correct 14 ms 5356 KB Output is correct
23 Correct 14 ms 5356 KB Output is correct
24 Correct 13 ms 5356 KB Output is correct
25 Correct 14 ms 5484 KB Output is correct
26 Correct 12 ms 5356 KB Output is correct

Subtask #5
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 1084 ms 32688 KB Output is correct
3 Correct 1429 ms 41672 KB Output is correct
4 Correct 1084 ms 32816 KB Output is correct
5 Correct 604 ms 32356 KB Output is correct
6 Correct 1362 ms 34308 KB Output is correct
7 Correct 571 ms 33116 KB Output is correct
8 Correct 1478 ms 42208 KB Output is correct
9 Correct 477 ms 34772 KB Output is correct
10 Correct 4 ms 5100 KB Output is correct
11 Correct 1160 ms 32880 KB Output is correct
12 Correct 1455 ms 43492 KB Output is correct
13 Correct 1097 ms 32668 KB Output is correct
14 Correct 605 ms 32152 KB Output is correct
15 Correct 1378 ms 34692 KB Output is correct
16 Correct 482 ms 34644 KB Output is correct
17 Correct 1460 ms 39332 KB Output is correct
18 Correct 476 ms 34772 KB Output is correct
19 Correct 4 ms 5100 KB Output is correct
20 Correct 1135 ms 32884 KB Output is correct
21 Correct 1428 ms 43492 KB Output is correct
22 Correct 1087 ms 32604 KB Output is correct
23 Correct 1151 ms 33140 KB Output is correct
24 Correct 1117 ms 33108 KB Output is correct
25 Correct 1138 ms 33084 KB Output is correct
26 Correct 1074 ms 33064 KB Output is correct
27 Correct 596 ms 32284 KB Output is correct
28 Correct 1331 ms 34396 KB Output is correct
29 Correct 1114 ms 32932 KB Output is correct
30 Correct 1008 ms 33248 KB Output is correct
31 Correct 531 ms 34412 KB Output is correct
32 Correct 1467 ms 39780 KB Output is correct
33 Correct 455 ms 34772 KB Output is correct

Subtask #6
0 / 44.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 4 ms 5100 KB Output is correct
5 Correct 4 ms 5100 KB Output is correct
6 Correct 4 ms 5100 KB Output is correct
7 Correct 4 ms 5100 KB Output is correct
8 Correct 4 ms 5100 KB Output is correct
9 Correct 4 ms 5100 KB Output is correct
10 Correct 4 ms 5100 KB Output is correct
11 Correct 4 ms 5100 KB Output is correct
12 Correct 4 ms 5100 KB Output is correct
13 Correct 1084 ms 32688 KB Output is correct
14 Correct 1429 ms 41672 KB Output is correct
15 Correct 1084 ms 32816 KB Output is correct
16 Correct 604 ms 32356 KB Output is correct
17 Correct 1362 ms 34308 KB Output is correct
18 Correct 571 ms 33116 KB Output is correct
19 Correct 1478 ms 42208 KB Output is correct
20 Correct 477 ms 34772 KB Output is correct
21 Correct 4 ms 5100 KB Output is correct
22 Correct 1160 ms 32880 KB Output is correct
23 Correct 1455 ms 43492 KB Output is correct
24 Correct 1097 ms 32668 KB Output is correct
25 Correct 605 ms 32152 KB Output is correct
26 Correct 1378 ms 34692 KB Output is correct
27 Correct 482 ms 34644 KB Output is correct
28 Correct 1460 ms 39332 KB Output is correct
29 Correct 476 ms 34772 KB Output is correct
30 Correct 4 ms 5100 KB Output is correct
31 Correct 14 ms 5356 KB Output is correct
32 Correct 14 ms 5484 KB Output is correct
33 Correct 14 ms 5356 KB Output is correct
34 Correct 14 ms 5356 KB Output is correct
35 Correct 14 ms 5356 KB Output is correct
36 Correct 14 ms 5356 KB Output is correct
37 Correct 17 ms 5356 KB Output is correct
38 Correct 13 ms 5356 KB Output is correct
39 Correct 15 ms 5356 KB Output is correct
40 Correct 14 ms 5356 KB Output is correct
41 Correct 14 ms 5356 KB Output is correct
42 Correct 13 ms 5356 KB Output is correct
43 Correct 14 ms 5484 KB Output is correct
44 Correct 12 ms 5356 KB Output is correct
45 Correct 4 ms 5100 KB Output is correct
46 Correct 1135 ms 32884 KB Output is correct
47 Correct 1428 ms 43492 KB Output is correct
48 Correct 1087 ms 32604 KB Output is correct
49 Correct 1151 ms 33140 KB Output is correct
50 Correct 1117 ms 33108 KB Output is correct
51 Correct 1138 ms 33084 KB Output is correct
52 Correct 1074 ms 33064 KB Output is correct
53 Correct 596 ms 32284 KB Output is correct
54 Correct 1331 ms 34396 KB Output is correct
55 Correct 1114 ms 32932 KB Output is correct
56 Correct 1008 ms 33248 KB Output is correct
57 Correct 531 ms 34412 KB Output is correct
58 Correct 1467 ms 39780 KB Output is correct
59 Correct 455 ms 34772 KB Output is correct
60 Correct 4 ms 5100 KB Output is correct
61 Correct 1623 ms 33848 KB Output is correct
62 Correct 1930 ms 42844 KB Output is correct
63 Correct 1595 ms 33944 KB Output is correct
64 Correct 1629 ms 33996 KB Output is correct
65 Correct 1575 ms 34516 KB Output is correct
66 Correct 1648 ms 34508 KB Output is correct
67 Correct 1644 ms 33816 KB Output is correct
68 Correct 1151 ms 34024 KB Output is correct
69 Correct 1872 ms 35196 KB Output is correct
70 Correct 1662 ms 41864 KB Output is correct
71 Correct 1511 ms 40608 KB Output is correct
72 Correct 1072 ms 43732 KB Output is correct
73 Execution timed out 2017 ms 47744 KB Time limit exceeded
74 Halted 0 ms 0 KB -