Submission #675102

#	Time	Username	Problem	Language	Result	Execution time	Memory
675102		vjudge1	Uzastopni (COCI15_uzastopni)	C++17	80 / 160	83 ms	65536 KiB

uzastopni

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;
const int maxn = 1e4 + 5;
int n, a[maxn], p[maxn];
vector <int> adj[maxn];
bool f[maxn][101][101];
vector <int> vt;

bool cmp(int i, int j) {
    return a[i] < a[j];
}

void DFS1(int u) {
    vt.push_back(u);
    for(int v : adj[u]) {
        if(v == p[u]) continue;
        p[v] = u;
        DFS1(v);
    }
}

void solve() {
    for(int id = int(vt.size() - 1); id >= 0; --id) {
        int u = vt[id];
        int d = lower_bound(adj[u].begin(), adj[u].end(), u, cmp) - adj[u].begin();
        f[u][a[u]][a[u]] = 1;
        for(int i = d - 1; i >= 0; --i) {
            int v = adj[u][i];
            if(v == p[u]) continue;

            for(int j = 1; j < a[u]; ++j) {
                for(int j1 = j; j1 < a[u]; ++j1) f[u][j][a[u]] |= (f[u][j1 + 1][a[u]] & f[v][j][j1]);
            }
        }
        for(int i = d; i < int(adj[u].size()); ++i) {
            int v = adj[u][i];
            if(v == p[u]) continue;
            for(int j = a[u] + 1; j <= 100; ++j) {
                for(int j1 = j; j1 <= 100; ++j1) f[u][a[u]][j1] |= (f[u][a[u]][j - 1] & f[v][j][j1]);
            }
        }
        for(int i = 1; i <= a[u]; ++i) {
            for(int j = a[u]; j <= 100; ++j) f[u][i][j] |= (f[u][i][a[u]] & f[u][a[u]][j]);
        }
    }
}

int main()
{
    ios_base::sync_with_stdio(NULL); cin.tie(nullptr);
    cin >> n;
    for(int i = 1; i <= n; ++i) cin >> a[i];
    for(int i = 1; i < n; ++i) {
        int u, v;
        cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    for(int i = 1; i <= n; ++i) sort(adj[i].begin(), adj[i].end(), cmp);
    DFS1(1);
    solve();
    int res =0 ;
    for(int i = 1; i <= 100; ++i) {
        for(int j = i; j <= 100; ++j) {
            if(f[1][i][j]) ++res;
        }
    }
    cout << res;
    return 0;
}

• Subtask 1: 80 / 160