Submission #1068085

#	Time	Username	Problem	Language	Result	Execution time	Memory
1068085		shidou26	Parkovi (COCI22_parkovi)	C++14	110 / 110	573 ms	35280 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define all(v) v.begin(), v.end()
#define filter(v) v.resize(unique(all(v)) - v.begin())

typedef long long ll;
typedef pair<int, int> ii;

const int MOD = 1e9 + 7;
inline ll add(ll x, ll y, ll mod = MOD) {return ((x % mod) + (y % mod)) % mod;}
inline ll sub(ll x, ll y, ll mod = MOD) {return ((x - y) % mod + mod) % mod;}
inline ll prod(ll x, ll y, ll mod = MOD) {return ((x % mod) * (y % mod)) % mod;}

const int N = 2e5 + 3;
const ll INF = 1e18;

int n, k;
vector<ii> adj[N];

int num_park = 0;
bool is_park[N];
ll near[N], reach[N];

void prepare() {

}

void input() {
	cin >> n >> k;

	for(int i = 1; i < n; i++) {
		int u, v, w; cin >> u >> v >> w;
		adj[u].push_back(ii(v, w));
		adj[v].push_back(ii(u, w));
	}
}

void dfs(int u, int p, ll limit) {
	near[u] = INF; reach[u] = 0;

	for(int i = 0; i < (int)adj[u].size(); i++) {
		int v, w; tie(v, w) = adj[u][i];

		if(v != p) {
			dfs(v, u, limit);

			if(reach[v] + min(1LL * w, near[v]) <= limit) {
				near[u] = min(near[u], near[v] + w);
				if(reach[v] + near[v] > limit) reach[u] = max(reach[u], reach[v] + w);
			}else {
				num_park++;
				is_park[v] = true;
				near[u] = min(near[u], 1LL * w);
			}
		}	
	}
}

bool check(ll limit) {
	num_park = 0;
	for(int i = 1; i <= n; i++) is_park[i] = false;

	dfs(1, -1, limit);

	if(reach[1] + near[1] > limit) {
		num_park++;
		is_park[1] = true;
	}

	return num_park <= k;
}

void process() {
	ll l = 0, r = 1e15, res = 0;
	while(l <= r) {
		ll m = (l + r) >> 1;
		if(check(m)) {
			res = m;
			r = m - 1;
		}else {
			l = m + 1;
		}
	}

	cout << res << endl;
	check(res);
	vector<int> nodes;
	for(int i = 1; i <= n; i++) if(is_park[i]) nodes.push_back(i);
	for(int i = 1; i <= n; i++) if((int)nodes.size() < k && !is_park[i]) nodes.push_back(i);
	for(int node : nodes) cout << node << " ";
}

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

    #define task "Date_A_Live"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    
    prepare();
    
    int tc = 1; // cin >> tc;
    
    for(int i = 1; i <= tc; i++) {
        input();
        process();
    }

    cerr << "Saa, watashtachi no deito hajimemashou" << endl;

    return 0;
}

/*
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*/

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:101:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  101 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:102:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  102 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 30 / 30
• Subtask 4: 60 / 60