Submission #548069

#	Time	Username	Problem	Language	Result	Execution time	Memory
548069		spike1236	Bitaro’s Party (JOI18_bitaro)	C++14	14 / 100	2069 ms	427532 KiB

bitaro

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define f first
#define s second
#define ll long long
#define ld long double
#define all(_v) _v.begin(), _v.end()
#define sz(_v) (int)_v.size()
#define pii pair <int, int>
#define pll pair <ll, ll>
#define veci vector <int>
#define vecll vector <ll>

const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, -1, 1};
const double PI = 3.1415926535897932384626433832795;
const double eps = 1e-9;
const int MOD1 = 1e9 + 7;
const int MOD2 = 998244353;

const int MAXN = 2e5 + 10, K = 400;
int n, m, q;
veci g[MAXN];
veci gr[MAXN];
vector <pii> dp[MAXN];
int d[MAXN];
bool was[MAXN];

bool cmp(const int &x, const int &y) {
    return (d[x] > d[y]);
}

void solve() {
    cin >> n >> m >> q;
    for(int i = 1; i <= m; ++i) {
        int u, v;
        cin >> u >> v;
        g[u].pb(v);
        gr[v].pb(u);
    }
    for(int i = 1; i <= n; ++i) {
        veci cur;
        cur.pb(i);
        for(auto to : gr[i]) {
            for(auto it : dp[to]) {
                if(!d[it.f]) cur.pb(it.f);
                d[it.f] = max(d[it.f], it.s + 1);
            }
        }
        sort(all(cur), &cmp);
        for(int j = 0; j < min(sz(cur), K + 1); ++j) dp[i].pb({cur[j], d[cur[j]]});
        for(auto it : cur) d[it] = 0;
        /**cout << i << ": ";
        for(auto it : dp[i]) cout << it.f << ' ' << it.s << '\n';
        cout << '\n';**/
    }
    for(int FUK = 1; FUK <= q; ++FUK) {
        int v, y;
        cin >> v >> y;
        veci bl;
        for(int j = 1, u; j <= y; ++j) {
            cin >> u;
            bl.pb(u);
            was[u] = 1;
        }
        int ans = -1;
        if(!was[v]) ans = 0;
        if(y < K) {
            for(auto it : dp[v]) if(!was[it.f]) ans = max(ans, it.s);
        } else {
            for(int j = 1; j <= v; ++j) {
                d[j] = 0;
                if(was[j]) d[j] = INT_MIN;
                for(auto it : gr[j]) d[j] = max(d[j], d[it] + 1);
            }
            ans = max(ans, d[v]);
        }
        cout << ans << '\n';
        for(auto it : bl) was[it] = 0;
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int CNT_TESTS = 1;
    ///cin >> CNT_TESTS;
    for(int NUMCASE = 1; NUMCASE <= CNT_TESTS; ++NUMCASE) {
        solve();
        if(NUMCASE != CNT_TESTS) cout << '\n';
    }
    return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 0 / 86