Submission #904694

#	Time	Username	Problem	Language	Result	Execution time	Memory
904694		marvinthang	Harvest (JOI20_harvest)	C++17	100 / 100	357 ms	76364 KiB

harvest

/*************************************
*    author: marvinthang             *
*    created: 12.01.2024 10:22:14    *
*************************************/

#include <bits/stdc++.h>

using namespace std;

#define                  fi  first
#define                  se  second
#define                left  ___left
#define               right  ___right
#define                TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define             MASK(i)  (1LL << (i))
#define           BIT(x, i)  ((x) >> (i) & 1)
#define  __builtin_popcount  __builtin_popcountll
#define              ALL(v)  (v).begin(), (v).end()
#define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
#define          REPD(i, n)  for (int i = (n); i-- > 0; )
#define        FOR(i, a, b)  for (int i = (a), _b = (b); i < _b; ++i) 
#define       FORD(i, b, a)  for (int i = (b), _a = (a); --i >= _a; ) 
#define       FORE(i, a, b)  for (int i = (a), _b = (b); i <= _b; ++i) 
#define      FORDE(i, b, a)  for (int i = (b), _a = (a); i >= _a; --i) 
#define        scan_op(...)  istream & operator >> (istream &in, __VA_ARGS__ &u)
#define       print_op(...)  ostream & operator << (ostream &out, const __VA_ARGS__ &u)
#ifdef LOCAL
    #include "debug.h"
#else
    #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
    #define DB(...) 23
    #define db(...) 23
    #define debug(...) 23
#endif

template <class U, class V> scan_op(pair <U, V>)  { return in >> u.first >> u.second; }
template <class T> scan_op(vector <T>)  { for (size_t i = 0; i < u.size(); ++i) in >> u[i]; return in; }
template <class U, class V> print_op(pair <U, V>)  { return out << '(' << u.first << ", " << u.second << ')'; }
template <size_t i, class T> ostream & print_tuple_utils(ostream &out, const T &tup) { if constexpr(i == tuple_size<T>::value) return out << ")";  else return print_tuple_utils<i + 1, T>(out << (i ? ", " : "(") << get<i>(tup), tup); }
template <class ...U> print_op(tuple<U...>) { return print_tuple_utils<0, tuple<U...>>(out, u); }
template <class Con, class = decltype(begin(declval<Con>()))> typename enable_if <!is_same<Con, string>::value, ostream&>::type operator << (ostream &out, const Con &con) { out << '{'; for (__typeof(con.begin()) it = con.begin(); it != con.end(); ++it) out << (it == con.begin() ? "" : ", ") << *it; return out << '}'; }

// index from 0
template <class T> struct Fenwick {
    int n; vector <T> bit;
    Fenwick(int _n = 0): n(_n), bit(n + 1, 0) {}
    void reset(void) { fill(bit.begin(), bit.end(), 0); }
    void resize(int _n) { bit.assign(_n + 1, 0); }
    void update(int i, T val) { for (++i; i <= n; i += i & -i) bit[i] += val; }
    T get(int i) {
        if (i < 0) return 0;
        T res(0);
        for (i = min(i + 1, n); i > 0; i &= i - 1) res += bit[i];
        return res;
    }
    int upper_bound(T val) {
        int res = 0;
        for (int i = __lg(n); i >= 0; --i) 
            if ((res | MASK(i)) <= n && val >= bit[res | MASK(i)]) res |= MASK(i), val -= bit[res];
        return res;
    }
    int lower_bound(T val) {
        int res = 0;
        for (int i = __lg(n); i >= 0; --i)
            if ((res | MASK(i)) <= n && val > bit[res | MASK(i)]) res |= MASK(i), val -= bit[res];
        return res;
    }
};

// end of template

void process(void) {
	int n, m, l, c; cin >> n >> m >> l >> c;
	vector <int> a(n), b(m); cin >> a >> b;
	int j = 0, k = 0;
	int div_c = c / l;
	int rem_c = c % l;
	vector <long long> w(n + m);
	vector <int> nxt(n);
	REP(i, n) {
		if (a[i] - a[0] < rem_c) {
			while (j + 1 < n && a[i] + l - a[j + 1] >= rem_c) ++j;
			nxt[i] = j;
			w[i] = div_c * l + a[i] + l - a[j];
		} else {
			while (k + 1 < n && a[i] - a[k + 1] >= rem_c) ++k;
			nxt[i] = k;
			w[i] = div_c * l + a[i] - a[k];
		}
	}
	vector <vector <int>> adj(n);
	j = 0;
	REP(i, m) {
		if (b[i] < a[0]) {
			adj[n - 1].push_back(i + n);
			w[i + n] = b[i] + l - a[n - 1];
		} else {
			while (j + 1 < n && a[j + 1] < b[i]) ++j;
			adj[j].push_back(i + n);
			w[i + n] = b[i] - a[j];
		}
	}
	vector <bool> visited(n);
	vector <int> in_cycle(n, -1), root_cycle(n, -1);
	int cnt_cycles = 0;
	vector <long long> dist(n + m);
	vector <long long> sum, suff(n);
	REP(i, n) if (!visited[i]) {
		int u = i;
		while (!visited[u]) {
			visited[u] = true;
			u = nxt[u];
		}
		if (root_cycle[u] == -1) {
			root_cycle[u] = u;
			int v = u;
			while (true) {
				in_cycle[v] = cnt_cycles;
				if (nxt[v] == u) break;
				adj[nxt[v]].push_back(v);
				v = nxt[v];
			}
			int t = u;
			suff[u] = w[v];
			root_cycle[v] = v;
			while (t != v) {
				root_cycle[t] = v;
				suff[nxt[t]] = suff[t] + w[t];
				t = nxt[t];
			}
			sum.push_back(suff[v]);
			++cnt_cycles;
		}
		int v = i;
		while (root_cycle[v] == -1) {
			adj[nxt[v]].push_back(v);
			root_cycle[v] = root_cycle[u];
			v = nxt[v];
		}
	}
	vector <int> tin(n + m), tout(n);
	int t = -1;
	vector <vector <long long>> List(cnt_cycles), pref(cnt_cycles);
	REP(i, n) if (root_cycle[i] == i) {
		int c = in_cycle[i];
		function<void(int)> dfs = [&] (int u) {
			tin[u] = ++t;
			if (u >= n) {
				List[c].push_back(dist[u]);
				return;
			}
			for (int v: adj[u]) {
				dist[v] = dist[u] + w[v];
				dfs(v);
			}
			tout[u] = t;
		};
		dfs(i);
		sort(ALL(List[c]));
		pref[c].push_back(0);
		for (auto x: List[c]) pref[c].push_back(pref[c].back() + x / sum[c]);
	}
	int q; cin >> q;
	vector <long long> res(q);
	vector <pair <long long, int>> queries;
	vector <vector <tuple <long long, int, int>>> queries_rem(cnt_cycles);
	vector <long long> V(q), T(q);
	REP(i, q) {
		cin >> V[i] >> T[i]; --V[i];		
		queries.emplace_back(T[i] + dist[V[i]], i);
		int c = in_cycle[V[i]];
		if (c != -1) {
			T[i] -= suff[V[i]];
			int p = upper_bound(ALL(List[c]), T[i]) - List[c].begin();
			res[i] += T[i] / sum[c] * p - pref[c][p];
			queries_rem[c].emplace_back(T[i] % sum[c], p, i);
		}
	}
	sort(ALL(queries));
	vector <int> order(m);
	iota(ALL(order), n);
	sort(ALL(order), [&] (int x, int y) { return dist[x] < dist[y]; });
	Fenwick <int> bit(n + m);
	j = 0;
	for (auto [t, i]: queries) {
		while (j < m && dist[order[j]] <= t) bit.update(tin[order[j++]], +1);
		res[i] += bit.get(tout[V[i]]) - bit.get(tin[V[i]] - 1);
	}
	REP(c, cnt_cycles) {
		Fenwick <int> bit(List[c].size());
		sort(ALL(queries_rem[c]));
		vector <pair <long long, int>> values;
		REP(i, List[c].size()) values.emplace_back(List[c][i] % sum[c], i);
		sort(ALL(values));
		j = 0;
		for (auto [t, p, i]: queries_rem[c]) {
			while (j < (int) values.size() && values[j].fi <= t) bit.update(values[j++].se, 1);
			res[i] += bit.get(p - 1);
		}
	}
	REP(i, q) cout << res[i] << '\n';
}

int main(void) {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); // cout.tie(nullptr);
	file("harvest");
	// int t; cin >> t; while (t--)
	process();
	// cerr << "Time elapsed: " << TIME << " s.\n";
	return (0^0);
}

Compilation message (stderr)

harvest.cpp: In function 'int main()':
harvest.cpp:30:61: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
harvest.cpp:206:2: note: in expansion of macro 'file'
  206 |  file("harvest");
      |  ^~~~
harvest.cpp:30:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
harvest.cpp:206:2: note: in expansion of macro 'file'
  206 |  file("harvest");
      |  ^~~~

• Subtask 1: 5 / 5
• Subtask 2: 20 / 20
• Subtask 3: 75 / 75