Submission #675485

#	Time	Username	Problem	Language	Result	Execution time	Memory
675485		messiuuuuu	Uzastopni (COCI15_uzastopni)	C++17	160 / 160	168 ms	18456 KiB

uzastopni

///
#include<bits/stdc++.h>
#define task "C"
#define ll long long
#define ld long double
#define fi first
#define se second
#define pb push_back
using namespace std;
const int MAXN = 1e4 + 5;
const ll INF = 1e18 + 5;

int n;
int c[MAXN];
vector<int> Adj[MAXN];

void Input()
{
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> c[i];
    for (int i = 1; i < n; i++)
    {
        int u, v;
        cin >> u >> v;
        Adj[u].pb(v);
        Adj[v].pb(u);
    }
}

bitset<105> dp[MAXN][105], t[105];
vector<int> pl[105], pr[105];

void DFS(int u, int par)
{
    for (int v : Adj[u])
    {
        if (v == par)
            continue;
        DFS(v, u);
    }
    for (int i = 1; i <= 100; i++)
    {
        t[i].reset();
        pl[i].clear();
        pr[i].clear();
    }
    for (int v : Adj[u])
    {
        if (v == par)
            continue;
        for (int l = 1; l <= 100; l++)
            for (int r = l; r <= 100; r++)
                if (dp[v][l][r])
                {
                    pl[l].pb(r);
                    pr[r].pb(l);
                }
    }
    t[c[u] - 1][c[u]] = t[c[u] + 1][c[u]] = 1;
    for (int i = 100; i >= c[u] + 1; i--)
    {
        for (int j : pl[i])
        {
            t[i][j] = 1;
            t[i] |= t[j + 1];
        }
    }
    for (int i = 1; i <= c[u] - 1; i++)
    {
        for (int j : pr[i])
        {
            t[i][j] = 1;
            t[i] |= t[j - 1];
        }
    }
    for (int x = 1; x <= 100; x++)
    {
        if (t[c[u] - 1][x] == 0)
            continue;
        for (int y = x; y <= 100; y++)
        {
            if (t[c[u] + 1][y] == 0)
                continue;
            dp[u][x][y] = 1;
        }
    }
}

void Solve()
{
    DFS(1, 0);
    int res = 0;
    for (int i = 1; i <= 100; i++)
    {
        for (int j = i; j <= 100; j++)
        {
            //if (dp[1][i][j])
             //   cout << i << ' ' << j << '\n';
            res += dp[1][i][j];
        }
    }
    cout << res;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen(task".INP","r"))
    {
        freopen(task".INP","r",stdin);
        //freopen(task".OUT","w",stdout);
    }
    Input();
    Solve();
}

Compilation message (stderr)

uzastopni.cpp: In function 'int main()':
uzastopni.cpp:112:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  112 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 160 / 160