Submission #1282919

#	Time	Username	Problem	Language	Result	Execution time	Memory
1282919		nhmktu	Uzastopni (COCI15_uzastopni)	C++17	104 / 160	148 ms	31216 KiB

uzastopni

#include <bits/stdc++.h>
#define ll long long
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define ROF(i,a,b) for(int i=a;i>=b;i--)
#define pi pair<int,int>
#define pii pair<int,pi>
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define sz(a) (int) a.size()
#define endl '\n'
#define data "data"

using namespace std;
const ll linf = 1e18;
const int inf = 1e9;
const int MOD = 1e9 + 7, N = 1e4;

void add(int &a, int b)
{
    a += b;
    if(a>=MOD)
        a-=MOD;
    if(a<0)
        a += MOD;
}

int modulo(int x)
{
    if(x<=1)
        return 1;
    return (MOD - MOD/x) * modulo(MOD/x) % MOD;
}

int mul(int a, int b)
{
    return (1ll *a%MOD * b%MOD) % MOD;
}

int n;
int V[N+3];
vector<int> adj[N+3];
bitset<103> dp[N+3][103];
vector<pi> S[N+3];
vector<int> tmp[103];

void inp(void)
{
    cin >> n;
    FOR(i, 1, n) cin >> V[i];
    FOR(i, 1, n -1)
    {
        int u, v; cin >> u >> v;
        adj[u].pb(v);
    }
}

void dfs(int u)
{
    FOR(i, 1, 100) tmp[i].clear();
    FOR(i, 0, sz(adj[u]) -1)
    {
        int v = adj[u][i];
        dfs(v);
    }

    FOR(i, 0, sz(adj[u]) -1)
    {
        int v = adj[u][i];
        FOR(j, 0, sz(S[v]) -1)
            tmp[S[v][j].fi].pb(S[v][j].se);
    }

    ROF(L, 100, 1)
    {
        if(L == V[u])
        {
            dp[u][L] |= dp[u][L+1];
            dp[u][L][L] = 1;
        }
        else
        {
            FOR(i, 0, sz(tmp[L]) - 1)
            {
                int R = tmp[L][i];
                if(V[u] < L || V[u] > R)
                {
                    dp[u][L] |= dp[u][R+1];
                    dp[u][L][R] = 1;
                }
                //if(L <= V[u] && V[u] <= R) continue;
            }
        }

        ROF(R, 100, L)
        {
            if(dp[u][L][R] && L <= V[u] && V[u] <= R)
                S[u].pb({L, R});
        }
    }
}

void solve(void)
{
    dfs(1);
    cout << sz(S[1]);
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    if(fopen(data".inp", "r"))
    {
        freopen(data".inp","r",stdin);
        freopen(data".out","w",stdout);
    }

    inp();
    solve();
    return 0;
}

Compilation message (stderr)

uzastopni.cpp: In function 'int main()':
uzastopni.cpp:117:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  117 |         freopen(data".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
uzastopni.cpp:118:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  118 |         freopen(data".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 104 / 160