Submission #1117802

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117802		vjudge1	Paprike (COI18_paprike)	C++17	0 / 100	5 ms	2140 KiB

paprike

// author - alimammadzade

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

struct dsu {
    vector<int> p;
    dsu(int n) { p.resize(n + 1); }
    int _find(int u) { return (p[u] < 0 ? u : p[u] = _find(p[u])); }
    void _union(int u, int v) { p[u] += p[v]; p[v] = u; }
};

signed main() {
    cin.tie(nullptr)->sync_with_stdio(0);
    system("cls"), freopen("in.txt", "r", stdin);
    int n, k, res = 20;
    cin >> n >> k;
    vector<int> w(n + 1);
    vector<array<int, 2>> e(n - 1);
    for (int i = 1; i <= n; i++) cin >> w[i];
    for (auto& [u, v] : e) cin >> u >> v;
    for (int i = 0; i < (1 << (n - 1)); i++) {
        dsu d(n);
        for (int j = 1; j <= n; i++) d.p[i] = -w[i];
        for (int j = 0; j < n - 1; j++) if (i & (1 << j)) {
            int u = d._find(e[j][0]), v = d._find(e[j][1]);
            if (u != v) d._union(u, v);
        }
        bool ok = 1;
        for (int j = 1; j <= n; j++) ok &= (d.p[d._find(j)] <= k);
        if (ok) res = min(res, n - 1 - __builtin_popcount(i));
    }
    cout << res;
}

Compilation message (stderr)

paprike.cpp: In function 'int main()':
paprike.cpp:16:11: warning: ignoring return value of 'int system(const char*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     system("cls"), freopen("in.txt", "r", stdin);
      |     ~~~~~~^~~~~~~
paprike.cpp:16:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     system("cls"), freopen("in.txt", "r", stdin);
      |                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 13
• Subtask 3: 0 / 27
• Subtask 4: 0 / 49