Submission #1115870

#	Time	Username	Problem	Language	Result	Execution time	Memory
1115870		vjudge1	Political Development (BOI17_politicaldevelopment)	C++17	100 / 100	1607 ms	306568 KiB

politicaldevelopment

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

#define name "TENBAI"
#define fi first
#define se second
#define int long long
#define endl '\n'
#define setmin(x, y) x = min((x), (y))
#define setmax(x, y) x = max((x), (y))
#define sqr(x) ((x) * (x))

mt19937 hdp(chrono::high_resolution_clock::now().time_since_epoch().count());
int rand(int l, int r){return l + ((hdp() % (r - l + 1)) + r - l + 1) % (r - l + 1);}

const int NM = 5e4 + 5;

int ans = 1, n, k;
bitset<NM> g[NM];

void dfs(int sz, const bitset<NM>& bs)
{
    setmax(ans, sz);
    for (int i = bs._Find_first(); i < n; i = bs._Find_next(i))
        dfs(sz + 1, bs & g[i]);
}

void sub1()
{
    vector<vector<int>> v;
    for (int i = 0; i < n; i++)
    {
        int t;
        cin >> t;
        while (t--)
        {
            int x;
            cin >> x;
            g[i][x] = 1;
        }
        for (int k = v.size(), j = 0; j < k; j++)
        {
            bool sus = 0;
            for (int x : v[j])
                if (!g[i][x])
                {
                    sus = 1;
                    break;
                }
            if (!sus)
            {
                v.push_back(v[j]);
                v.back().push_back(i);
                setmax(ans, (int)v.back().size());
            }
        }
        v.push_back(vector<int>(1, i));
    }
    cout << ans;
}

void sub2()
{
    for (int i = 0; i < n; i++)
    {
        int t;
        cin >> t;
        while (t--)
        {
            int x;
            cin >> x;
            g[i][x] = 1;
        }
    }
    for (int i = 0; i < n; i++)
        dfs(1, g[i]);
    cout << ans;
}

void solve()
{
    cin >> n >> k;
    if (n <= 5000)
        sub1();
    else
        sub2();
}

signed main()
{
    if (fopen("in.txt", "r")) 
    {
        freopen("in.txt", "r", stdin);
        freopen("out.txt", "w", stdout);
    }
    else if (fopen(name".inp", "r"))
    {
        freopen(name".inp", "r", stdin);
        freopen(name".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    int tc = 1; 
    // cin >> tc;
    while (tc--)
        solve();
}

Compilation message (stderr)

politicaldevelopment.cpp: In function 'int main()':
politicaldevelopment.cpp:93:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |         freopen("in.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
politicaldevelopment.cpp:94:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |         freopen("out.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
politicaldevelopment.cpp:98:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   98 |         freopen(name".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
politicaldevelopment.cpp:99:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   99 |         freopen(name".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 38 / 38
• Subtask 5: 23 / 23