Submission #1265406

#	Time	Username	Problem	Language	Result	Execution time	Memory
1265406		quangminh412	Long Mansion (JOI17_long_mansion)	C++17	10 / 100	156 ms	69808 KiB

long_mansion

/*
  Ben Watson

  Quang Minh MasterDDDDD
*/

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

#define ll long long

const string name = "test";

void solve();
signed main()
{
    if (fopen((name + ".inp").c_str(), "r"))
    {
        freopen((name + ".inp").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    solve();

    return 0;
}

// main program
const int maxn = 5001;

vector<int> keys[maxn];
int c[maxn], can[maxn][maxn];
int n, q;

void compute(int st)
{
    vector<int> cur(n + 1, 0), vis(n + 1, 0);
    vis[st] = 1;
    for (int a : keys[st])
        cur[a] = 1;

    int l = st, r = st;
    while (1)
    {
        bool proceed = false;
        if (l != 1)
        {
            int need = c[l - 1];
            if (cur[need])
            {
                l--; vis[l] = 1; proceed = true;
                for (int a : keys[l])
                    cur[a] = 1;
            }
        }
        if (r != n)
        {
            int need = c[r];
            if (cur[need])
            {
                r++; vis[r] = 1; proceed = true;
                for (int a : keys[r])
                    cur[a] = 1;
            }
        }
        if (l != 1)
        {
            int need = c[l - 1];
            if (cur[need])
            {
                l--; vis[l] = 1; proceed = true;
                for (int a : keys[l])
                    cur[a] = 1;
            }
        }
        if (r != n)
        {
            int need = c[r];
            if (cur[need])
            {
                r++; vis[r] = 1; proceed = true;
                for (int a : keys[r])
                    cur[a] = 1;
            }
        }
        if (!proceed)
            break;
    }
    for (int i = 1; i <= n; i++)
        if (vis[i] == 1)
            can[st][i] = 1;
}

void solve()
{
    cin >> n;
    for (int i = 1; i < n; i++)
        cin >> c[i];
    for (int i = 1; i <= n; i++)
    {
        int b; cin >> b;
        for (int j = 0; j < b; j++)
        {
            int a; cin >> a;
            keys[i].push_back(a);
        }
    }

    for (int i = 1; i <= n; i++)
        compute(i);

    cin >> q;
    while (q--)
    {
        int x, y; cin >> x >> y;

        cout << (can[x][y] == 1 ? "YES\n" : "NO\n");
    }
}

Compilation message (stderr)

long_mansion.cpp: In function 'int main()':
long_mansion.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen((name + ".inp").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
long_mansion.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 15
• Subtask 4: 0 / 75