Submission #876823

#	Time	Username	Problem	Language	Result	Execution time	Memory
876823		overwatch9	Sjekira (COCI20_sjekira)	C++17	0 / 110	0 ms	348 KiB

sjekira

//subtask3
#include <iostream>
#include <vector>
#include <set>
using namespace std;
using ll = long long;
vector <bool> blocked;
vector <vector <int>> adj;
vector <int> col;
int dfs(int s, int p) {
    int ans = col[s];
    for (auto i : adj[s]) {
        if (!blocked[i] && i != p)
            ans = max(ans, dfs(i, s));
    }
    return ans;
}
int main() {
    freopen("in.txt", "r", stdin);
    int n;
    cin >> n;
    adj.resize(n+1);
    col.resize(n+1);
    multiset <pair <int, int>> s;
    for (int i = 1; i <= n; i++) {
        int t;
        cin >> t;
        col[i] = t;
        s.insert({t, i});
    }
    for (int i = 0; i < n-1; i++) {
        int a, b;
        cin >> a >> b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    blocked.resize(n+1);
    ll ans = 0;
    while (!s.empty()) {
        ll mx = s.rbegin()->first, pos = s.rbegin()->second;
        s.erase(--s.end());
        ll added = 0;
        for (auto i : adj[pos]) {
            if (!blocked[i]) {
                added++;
                ans += dfs(i, pos);
            }
        }
        blocked[pos] = true;
        ans += mx * added;
    }
    cout << ans << '\n';
}

Compilation message (stderr)

sjekira.cpp: In function 'int main()':
sjekira.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen("in.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 30
• Subtask 4: 0 / 60