제출 #1281621

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1281621		KickingKun	Bitaro’s Party (JOI18_bitaro)	C++20	14 / 100	253 ms	77736 KiB

bitaro

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

#define ll long long
#define ull unsigned long long
#define ld long double
#define bigint __int128
#define emb emplace_back
#define pb push_back
#define pii pair <int, int>
#define fi first
#define se second
#define all(v) v.begin(), v.end()
#define Task ""

#define MASK(k) (1ull << k)
#define bitcnt(k) __builtin_popcount(k)
#define testBit(n, k) ((n >> k) & 1)
#define flipBit(n, k) (n ^ (1ll << k))
#define offBit(n, k) (n & ~MASK(k))
#define onBit(n, k) (n | (1ll << k))

template <class T> bool minimize(T &a, T b) {if (a > b) {a = b; return true;} return false;}
template <class T> bool maximize(T &a, T b) {if (a < b) {a = b; return true;} return false;}

const int N = 1e5 + 5, lim = 60, mod = 1e9 + 7;
const ll INF = 1e18;

int n, m, q, t[N];
vector <int> to[N], ban[N];

namespace sub12 {
	void solve() {
		for (int i = 0; i < q; i++) {
			vector <int> dp(t[i] + 1, 0);
			for (int &x: ban[i]) dp[x] = -1e9;
			for (int u = 1; u <= t[i]; u++) {
				for (int v: to[u]) maximize(dp[u], dp[v] + 1);
			}
			cout << (dp[t[i]] < 0 ? -1 : dp[t[i]]) << '\n';
		}
	}
}

namespace sub3 {
	const int BLOCK = 100;

	vector <pii> candidate[N];

	void solve() {
		bitset <N> mark; mark.reset();
		for (int u = 1; u <= n; u++) {
			for (int v: to[u]) {
				if (candidate[u].empty()) candidate[u] = candidate[v];
				else {
					vector <pii> merge; int l = 0, r = 0;
					while (l < candidate[u].size() && r < candidate[v].size()) {
						if (merge.size() == BLOCK) break;
						if (mark.test(candidate[u][l].se)) ++l;
						else if (mark.test(candidate[v][r].se)) ++r;
						else if (candidate[u][l] > candidate[v][r]) {
							mark.set(candidate[u][l].se);
							merge.emplace_back(candidate[u][l++]);
						}
						else {
							mark.set(candidate[v][r].se);
							merge.emplace_back(candidate[v][r++]);
						}
					}
					while (merge.size() < BLOCK && l < candidate[u].size()) {
						if (mark.test(candidate[u][l].se)) ++l;
						else merge.emplace_back(candidate[u][l++]);
					}
					while (merge.size() < BLOCK && r < candidate[v].size()) {
						if (mark.test(candidate[v][r].se)) ++r;
						merge.emplace_back(candidate[v][r++]);
					}
					candidate[u] = merge;

					for (auto [d, v]: candidate[u])
						mark.reset(v);
				}
			}

			for (int i = 0; i < candidate[u].size(); i++) ++candidate[u][i].fi;
			if (candidate[u].size() < BLOCK)
				candidate[u].emplace_back(0, u);
		}

		return;

		// for (int u = 1; u <= n; u++) {
		// 	cerr << u << ": ";
		// 	for (auto [d, v]: candidate[u])
		// 		cerr << "(" << d << ' ' << v << "), ";
		// 	cerr << '\n';
		// }

		mark.reset(); vector <int> dp(n + 1);
		for (int i = 0; i < q; i++) {
			// |ban[i]| <= t[i] -> |ban[i]| <= |candidate[t[i]] chua opt
			if (ban[i].size() < candidate[t[i]].size()) { 
				// |ban[i]| < |candidate[t[i]]|
				int ans;
				for (int &x: ban[i]) mark.set(x);
				for (auto [d, u]: candidate[t[i]]) {
					if (!mark.test(u)) {
						ans = d; break;
					}
				}
				for (int &x: ban[i]) mark.reset(x);
				cout << ans << '\n';
			}
			else {
				for (int u = 1; u <= t[i]; i++) dp[u] = 0;
				for (int &u: ban[i]) dp[u] = -1e9;
				for (int u = 1; u <= t[i]; u++) {
					for (int v: to[u]) maximize(dp[u], dp[v] + 1);
				}
				cout << (dp[t[i]] < 0 ? -1 : dp[t[i]]) << '\n';
			}
		}
	}
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

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

	cin >> n >> m >> q;
	for (int i = 0; i < m; i++) {
		int u, v; cin >> u >> v;
		to[v].emplace_back(u);
	}

	for (int i = 0; i < q; i++) {
		int sz; cin >> t[i] >> sz;
		ban[i].assign(sz, 0);
		for (int &x: ban[i]) cin >> x;
		while (!ban[i].empty() && ban[i].back() > t[i]) ban[i].pop_back();
	}

	if (q == 1) sub12::solve();
	else sub3::solve();
}

컴파일 시 표준 에러 (stderr) 메시지

bitaro.cpp: In function 'int main()':
bitaro.cpp:130:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  130 |                 freopen(Task".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp:131:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  131 |                 freopen(Task".out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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