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Submission #538708

# Submission time Handle Problem Language Result Execution time Memory
538708 2022-03-17T15:02:42 Z S2speed Beads and wires (APIO14_beads) C++17
57 / 100
 150 ms 43832 KB 
#include<bits/stdc++.h>

using namespace std;

#define all(x) x.begin() , x.end()
typedef long long ll;
typedef pair<ll , ll> pll;

const ll maxn = 1e5 + 16 , inf = 2e16;

ll dp[maxn][2] , w[maxn];
vector<pll> adj[maxn];
multiset<ll , greater<ll>> s[maxn];

void dDFS(ll r , ll par){
	ll res = 0 , mx;
	s[r].insert(-inf);
	for(auto p : adj[r]){
		ll i = p.first , w = p.second;
		if(i == par) continue;
		dDFS(i , r);
		ll h = max(dp[i][0] , dp[i][1] + w) , o = dp[i][0] + w - h;
		res += h;
		s[r].insert(o);
	}
	dp[r][1] = res + *s[r].begin();
	dp[r][0] = res;
	return;
}

void reroot(ll v , ll u , ll w){
	ll h = max(dp[u][0] , dp[u][1] + w) , o = dp[u][0] + w - h;
	s[v].erase(s[v].find(o));
	dp[v][0] -= h;
	dp[v][1] = dp[v][0] + *s[v].begin();
	h = max(dp[v][0] , dp[v][1] + w); o = dp[v][0] + w - h;
	s[u].insert(o);
	dp[u][0] += h;
	dp[u][1] = dp[u][0] + *s[u].begin();
	return;
}

ll ans = 0;

void rDFS(ll r , ll par){
	ans = max(ans , dp[r][0]);
	for(auto p : adj[r]){
		ll i = p.first , w = p.second;
		if(i == par) continue;
		reroot(r , i , w);
		rDFS(i , r);
		reroot(i , r , w);
	}
	return;
}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

	ll n;
	cin>>n;
	for(ll i = 1 ; i < n ; i++){
		ll v , u , w;
		cin>>v>>u>>w; v--; u--;
		adj[v].push_back({u , w}); adj[u].push_back({v , w});
	}
	dDFS(0 , -1);
	rDFS(0 , -1);
	cout<<ans<<'\n';
	return 0;
}

Compilation message

beads.cpp: In function 'void dDFS(ll, ll)':
beads.cpp:16:15: warning: unused variable 'mx' [-Wunused-variable]
   16 |  ll res = 0 , mx;
      |               ^~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7252 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 4 ms 7252 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 5 ms 7252 KB Output is correct
6 Correct 6 ms 7252 KB Output is correct
7 Correct 4 ms 7372 KB Output is correct
8 Correct 4 ms 7252 KB Output is correct
9 Correct 5 ms 7380 KB Output is correct
10 Correct 5 ms 7372 KB Output is correct
11 Correct 4 ms 7376 KB Output is correct
12 Correct 6 ms 7380 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7252 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 4 ms 7252 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 5 ms 7252 KB Output is correct
6 Correct 6 ms 7252 KB Output is correct
7 Correct 4 ms 7372 KB Output is correct
8 Correct 4 ms 7252 KB Output is correct
9 Correct 5 ms 7380 KB Output is correct
10 Correct 5 ms 7372 KB Output is correct
11 Correct 4 ms 7376 KB Output is correct
12 Correct 6 ms 7380 KB Output is correct
13 Correct 6 ms 7380 KB Output is correct
14 Correct 4 ms 7376 KB Output is correct
15 Correct 5 ms 7380 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 4 ms 7376 KB Output is correct
19 Correct 4 ms 7380 KB Output is correct
20 Correct 4 ms 7376 KB Output is correct
21 Correct 4 ms 7376 KB Output is correct
22 Correct 4 ms 7380 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7252 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 4 ms 7252 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 5 ms 7252 KB Output is correct
6 Correct 6 ms 7252 KB Output is correct
7 Correct 4 ms 7372 KB Output is correct
8 Correct 4 ms 7252 KB Output is correct
9 Correct 5 ms 7380 KB Output is correct
10 Correct 5 ms 7372 KB Output is correct
11 Correct 4 ms 7376 KB Output is correct
12 Correct 6 ms 7380 KB Output is correct
13 Correct 6 ms 7380 KB Output is correct
14 Correct 4 ms 7376 KB Output is correct
15 Correct 5 ms 7380 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 4 ms 7376 KB Output is correct
19 Correct 4 ms 7380 KB Output is correct
20 Correct 4 ms 7376 KB Output is correct
21 Correct 4 ms 7376 KB Output is correct
22 Correct 4 ms 7380 KB Output is correct
23 Correct 10 ms 8252 KB Output is correct
24 Correct 7 ms 8148 KB Output is correct
25 Correct 8 ms 8152 KB Output is correct
26 Correct 12 ms 9056 KB Output is correct
27 Correct 14 ms 9036 KB Output is correct
28 Correct 15 ms 9032 KB Output is correct
29 Correct 17 ms 9100 KB Output is correct
30 Correct 14 ms 9044 KB Output is correct
31 Correct 13 ms 9560 KB Output is correct

Subtask #4
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7252 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 4 ms 7252 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 5 ms 7252 KB Output is correct
6 Correct 6 ms 7252 KB Output is correct
7 Correct 4 ms 7372 KB Output is correct
8 Correct 4 ms 7252 KB Output is correct
9 Correct 5 ms 7380 KB Output is correct
10 Correct 5 ms 7372 KB Output is correct
11 Correct 4 ms 7376 KB Output is correct
12 Correct 6 ms 7380 KB Output is correct
13 Correct 6 ms 7380 KB Output is correct
14 Correct 4 ms 7376 KB Output is correct
15 Correct 5 ms 7380 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 4 ms 7376 KB Output is correct
19 Correct 4 ms 7380 KB Output is correct
20 Correct 4 ms 7376 KB Output is correct
21 Correct 4 ms 7376 KB Output is correct
22 Correct 4 ms 7380 KB Output is correct
23 Correct 10 ms 8252 KB Output is correct
24 Correct 7 ms 8148 KB Output is correct
25 Correct 8 ms 8152 KB Output is correct
26 Correct 12 ms 9056 KB Output is correct
27 Correct 14 ms 9036 KB Output is correct
28 Correct 15 ms 9032 KB Output is correct
29 Correct 17 ms 9100 KB Output is correct
30 Correct 14 ms 9044 KB Output is correct
31 Correct 13 ms 9560 KB Output is correct
32 Correct 57 ms 16064 KB Output is correct
33 Correct 61 ms 16200 KB Output is correct
34 Correct 81 ms 16084 KB Output is correct
35 Runtime error 150 ms 43832 KB Execution killed with signal 11
36 Halted 0 ms 0 KB -