Submission #675261

#	Time	Username	Problem	Language	Result	Execution time	Memory
675261		tamthegod	Uzastopni (COCI15_uzastopni)	C++14	80 / 160	149 ms	33944 KiB

uzastopni

// Make the best become better
// No room for laziness
#include<bits/stdc++.h>

#define int long long
#define pb push_back
#define fi first
#define se second
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 1e4 + 5;
const int maxV = 105;
const int mod = 1e9 + 7;
const ll oo = 1e18;
int n;
int a[maxN];
vector<int> adj[maxN];
int deg[maxN];
int root;
bool can[maxN];
bitset<maxV> bs[maxN][maxV];
void ReadInput()
{
    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].pb(v);
        deg[v]++;
    }
}
void dfs(int u)
{
    bs[u][a[u]][a[u]] = 1;
    for(int v : adj[u])
    {
        dfs(v);
    }
    bitset<maxV> f[maxV];
    f[a[u]][a[u]] = 1;
    for(int v : adj[u])
    {
        for(int l=1; l<=100; l++)
            f[l] |= bs[v][l];
    }
    for(int l=1; l<=100; l++)
        for(int r=l; r<=100; r++)
            if(f[l][r]) f[l] |= f[r + 1];
    for(int l=1; l<=100; l++)
        for(int r=l; r<=100; r++)
            if(l <= a[u] && r >= a[u] && f[l][r])
               bs[u][l][r] = 1;
}
void Solve()
{
    for(int i=1; i<=n; i++)
        if(!deg[i])
            root = i;
    dfs(root);
 //   cout << bs[1][3][4];return;
    int res = 0;
    for(int l=1; l<=100; l++)
        for(int r=l; r<=100; r++)
            res += bs[root][l][r];
    cout << res;
}
int32_t main()
{
  //  freopen("x.inp", "r", stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    ReadInput();
    Solve();
}

• Subtask 1: 80 / 160