oj.uz

Submission #689333

# Submission time Handle Problem Language Result Execution time Memory
689333 2023-01-28T08:18:32 Z sudheerays123 Roadside Advertisements (NOI17_roadsideadverts) C++17
100 / 100
 95 ms 18648 KB 
#include<bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define ll long long int
const ll N = 50000+5 , INF = 1e18 , MOD = 1e9+7;

vector<pair<ll,ll>> adj[N];
vector<vector<ll>> up(N,vector<ll>(log2(N)+5));
vector<ll> level(N) , tin(N) , dist(N);
ll timer = 0;

void dfs(ll s , ll p){

	timer++;
	tin[s] = timer;

	for(auto u : adj[s]){

		if(u.first == p) continue;

		level[u.first] = level[s]+1;
		dist[u.first] = dist[s]+u.second;

		up[u.first][0] = s;
		for(ll i = 1; i <= log2(N); i++) up[u.first][i] = up[up[u.first][i-1]][i-1];

		dfs(u.first,s);
	}
}

ll jump(ll a , ll k){
	for(ll i = 0; i <= log2(N); i++){
		if(k&(1ll<<i)){
			a = up[a][i];
		}
	}
	return a;
}

ll lca(ll a , ll b){

	if(level[a] > level[b]) swap(a,b);
	b = jump(b,level[b]-level[a]);

	if(a == b) return a;

	for(ll i = log2(N); i >= 0; i--){
		if(up[a][i] != up[b][i]){
			a = up[a][i];
			b = up[b][i];
		}
	}

	return up[a][0];
}

ll distanc(ll a , ll b){
	return dist[a]+dist[b]-2*dist[lca(a,b)];
}

bool comp(ll a , ll b){
	return tin[a] < tin[b];
}

void solve(){

	ll n;
	cin >> n;


	for(ll i = 1; i < n; i++){
		ll a,b,c;
		cin >> a >> b >> c;

		a++;b++;

		adj[a].push_back(make_pair(b,c));
		adj[b].push_back(make_pair(a,c));
	}

	dist[1] = 0;
	level[1] = 0;
	for(ll i = 0; i <= log2(N); i++) up[1][i] = 0;

	dfs(1,0);

	ll q;
	cin >> q;

	while(q--){
		vector<ll> nodes;
		for(ll i = 1; i <= 5; i++){
			ll x;
			cin >> x;

			nodes.push_back(x+1);
		}

		sort(nodes.begin(),nodes.end(),comp);

		ll ans = 0;
		for(ll i = 1; i < 5; i++) ans += distanc(nodes[i],nodes[i-1]);
		ans += distanc(nodes[0],nodes[4]);

		ans /= 2;
		cout << ans << "\n"; 
	}
}

int main(){

	fast;

	ll tc = 1;
	// cin >> tc;
	while(tc--) solve();

	return 0;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12372 KB Output is correct

Subtask #2
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 81 ms 17088 KB Output is correct
2 Correct 87 ms 18540 KB Output is correct
3 Correct 79 ms 18460 KB Output is correct
4 Correct 72 ms 18428 KB Output is correct
5 Correct 85 ms 18648 KB Output is correct
6 Correct 93 ms 18532 KB Output is correct
7 Correct 72 ms 18520 KB Output is correct
8 Correct 72 ms 18512 KB Output is correct
9 Correct 82 ms 18504 KB Output is correct
10 Correct 78 ms 18472 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 15688 KB Output is correct
2 Correct 53 ms 17748 KB Output is correct
3 Correct 57 ms 17768 KB Output is correct
4 Correct 49 ms 17756 KB Output is correct
5 Correct 50 ms 17776 KB Output is correct
6 Correct 54 ms 17700 KB Output is correct
7 Correct 61 ms 17704 KB Output is correct
8 Correct 55 ms 17788 KB Output is correct
9 Correct 57 ms 17800 KB Output is correct
10 Correct 53 ms 17924 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12372 KB Output is correct
2 Correct 81 ms 17088 KB Output is correct
3 Correct 87 ms 18540 KB Output is correct
4 Correct 79 ms 18460 KB Output is correct
5 Correct 72 ms 18428 KB Output is correct
6 Correct 85 ms 18648 KB Output is correct
7 Correct 93 ms 18532 KB Output is correct
8 Correct 72 ms 18520 KB Output is correct
9 Correct 72 ms 18512 KB Output is correct
10 Correct 82 ms 18504 KB Output is correct
11 Correct 78 ms 18472 KB Output is correct
12 Correct 43 ms 15688 KB Output is correct
13 Correct 53 ms 17748 KB Output is correct
14 Correct 57 ms 17768 KB Output is correct
15 Correct 49 ms 17756 KB Output is correct
16 Correct 50 ms 17776 KB Output is correct
17 Correct 54 ms 17700 KB Output is correct
18 Correct 61 ms 17704 KB Output is correct
19 Correct 55 ms 17788 KB Output is correct
20 Correct 57 ms 17800 KB Output is correct
21 Correct 53 ms 17924 KB Output is correct
22 Correct 72 ms 17064 KB Output is correct
23 Correct 61 ms 16072 KB Output is correct
24 Correct 80 ms 18140 KB Output is correct
25 Correct 74 ms 18092 KB Output is correct
26 Correct 83 ms 18048 KB Output is correct
27 Correct 80 ms 18252 KB Output is correct
28 Correct 72 ms 18112 KB Output is correct
29 Correct 95 ms 18052 KB Output is correct
30 Correct 71 ms 18172 KB Output is correct
31 Correct 78 ms 18144 KB Output is correct