oj.uz

Submission #670181

# Submission time Handle Problem Language Result Execution time Memory
670181 2022-12-08T08:45:45 Z radal Beads and wires (APIO14_beads) C++17
57 / 100
 907 ms 7560 KB 
#include <bits/stdc++.h>
#pragma GCC target("sse,sse2,avx2")
#pragma GCC optimize("unroll-loops,O2")
#define rep(i,l,r) for (int i = l; i < r; i++)
#define repr(i,r,l) for (int i = r; i >= l; i--)
#define X first
#define Y second
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define endl '\n'
#define debug(x) cerr << #x << " : " << x << endl;
using namespace std;
typedef long long ll;
typedef pair<int,int> pll;
constexpr int N = 2e5+10,mod = 1e9+7,maxm = 210;
constexpr ll inf = 1e9+10;
inline int mkay(int a,int b){
    if (a+b >= mod) return a+b-mod;
   // if (a+b < 0) return a+b+mod;
    return a+b;
}
 
inline int poww(int a,int k){
    if (k < 0) return 0;
    int z = 1;
    while (k){
        if (k&1) z = 1ll*z*a%mod;
        a = 1ll*a*a%mod;
        k >>= 1;
    } 
    return z; 
}
 
vector<pll> adj[N];
int dp[N][2];
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
void dfs(int v,int p){
	if ((int) adj[v].size() == 1 && p != 0){
		dp[v][1] = -2*inf;
		dp[v][0] = 0;
		return;
	}
	int s = 0,mx = -2*inf;
	for (auto [u,w] : adj[v]){
		if (u == p) continue;
		dfs(u,v);
		int val = max(dp[u][0],dp[u][1]+w);
		s += val;
		mx = max(mx,dp[u][0]-val+w);
	}
	dp[v][0] = s;
	dp[v][1] = s + mx;
}
 
bool cmp(int i,int j){
	return adj[i][0].Y > adj[j][0].Y;
}

int main(){
	ios :: sync_with_stdio(0); cin.tie(0); 
	int n;
	cin >> n;
	rep(i,1,n){
		int u,v,w;
		cin >> u >> v >> w;
		adj[u].pb({v,w});
		adj[v].pb({u,w});
	}
	if (n <= 2){
		cout << 0 << endl;
		return 0;
	}
	vector<int> leaf;
	rep(i,1,n+1){
		if ((int)adj[i].size() == 1){
		   	leaf.pb(i);
		}
	}

	sort(all(leaf),cmp);
	int t = min(30000000/n,(int)leaf.size()),ans = 0;
	rep(i,0,t){
	   	dfs(leaf[i],0);
		ans = max(ans,dp[leaf[i]][0]);
	}
	dfs(2,0);
	ans = max(ans,dp[2][0]);
	dfs(adj[2][0].X,0);
	ans = max(ans,dp[adj[2][0].X][0]);
	cout << ans;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 4 ms 4948 KB Output is correct
22 Correct 3 ms 4948 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 4 ms 4948 KB Output is correct
22 Correct 3 ms 4948 KB Output is correct
23 Correct 202 ms 5268 KB Output is correct
24 Correct 206 ms 5268 KB Output is correct
25 Correct 203 ms 5260 KB Output is correct
26 Correct 643 ms 5524 KB Output is correct
27 Correct 638 ms 5516 KB Output is correct
28 Correct 209 ms 5708 KB Output is correct
29 Correct 192 ms 5596 KB Output is correct
30 Correct 265 ms 5588 KB Output is correct
31 Correct 611 ms 5884 KB Output is correct

Subtask #4
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 4 ms 4948 KB Output is correct
22 Correct 3 ms 4948 KB Output is correct
23 Correct 202 ms 5268 KB Output is correct
24 Correct 206 ms 5268 KB Output is correct
25 Correct 203 ms 5260 KB Output is correct
26 Correct 643 ms 5524 KB Output is correct
27 Correct 638 ms 5516 KB Output is correct
28 Correct 209 ms 5708 KB Output is correct
29 Correct 192 ms 5596 KB Output is correct
30 Correct 265 ms 5588 KB Output is correct
31 Correct 611 ms 5884 KB Output is correct
32 Incorrect 907 ms 7560 KB Output isn't correct
33 Halted 0 ms 0 KB -