Submission #651424

#	Time	Username	Problem	Language	Result	Execution time	Memory
651424		shmad	Bitaro’s Party (JOI18_bitaro)	C++17	7 / 100	2093 ms	455816 KiB

bitaro

#include <bits/stdc++.h>
 
#define int long long
#define vt vector
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define ff first
#define ss second
#define dbg(x) cerr << #x << " = " << x << '\n'
#define bit(x, i) ((x) >> (i) & 1)
 
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vvt = vt< vt<int> >;
 
const int N = 1e5 + 5, mod = 1e9 + 7, B = 150;
const ll inf = 1e18 + 7, LIM = (1ll << 60);
const double eps = 1e-6;
 
int n, m, q, dp[N], c[N];
bool used[N], can[N];
vt<int> g[N];
vt<pii> f[N];
 
void solve () {
	cin >> n >> m >> q;
	for (int i = 1; i <= m; i++) {
		int x, y;
		cin >> x >> y;
		g[x].pb(y);
	}
	for (int i = 1; i <= n; i++) f[i].pb({0, i});
	for (int i = 1; i <= n; i++) {
		sort(all(f[i]));
		reverse(all(f[i]));
		vt<pii> nf;
		for (auto [dist, v]: f[i]) used[v] = 0;
		for (auto [dist, v]: f[i]) {
		 	if (used[v]) continue;
		 	used[v] = 1;
		 	nf.pb({dist, v});
		 	if (sz(nf) == B) break;
		}
		f[i] = nf;
		for (auto [dist, v]: f[i]) {
			for (auto to: g[i]) f[to].pb({dist + 1, v});
		}
	}
	fill(can, can + n + 1, 1);
	while (q--) {
		int t, y;
		cin >> t >> y;
		for (int i = 1; i <= y; i++) {
			cin >> c[i];
			can[c[i]] = 0;	
		}
		int ans = -1;
		if (y >= B) {
		 	dp[t] = 0;
		 	for (int i = t - 1; i >= 1; i--) {
		 		dp[i] = -1;
		 		for (auto to: g[i]) {
		 			if (to <= t && dp[to] != -1) dp[i] = max(dp[i], dp[to] + 1);	
		 		}
		 	}
		 	for (int i = 1; i <= t; i++) {
		 		if (can[i]) ans = max(ans, dp[i]);
		 	}
		}
		else {
			for (auto [dist, v]: f[t]) {
				if (can[v]) {
					ans = dist;
					break;
				}
			}
		}
		cout << ans << '\n';
		for (int i = 1; i <= y; i++) can[c[i]] = 1;
	}
	cout << '\n';
}
 
bool testcases = 0;
 
signed main() {
#ifdef ONLINE_JUDGE
	freopen(".in", "r", stdin);
	freopen(".out", "w", stdout);
#endif
	cin.tie(0) -> sync_with_stdio(0);
	int test = 1;
	if (testcases) cin >> test;
	for (int cs = 1; cs <= test; cs++) {
		solve();
	}
}

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