Submission #616501

#	Time	Username	Problem	Language	Result	Execution time	Memory
616501		cheissmart	Fish 2 (JOI22_fish2)	C++14	60 / 100	4030 ms	55532 KiB

fish2

// 花啊啊啊啊啊啊啊啊啊啊啊啊
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define IO_OP std::ios::sync_with_stdio(0); std::cin.tie(0);
#define F first
#define S second
#define V vector
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define SZ(v) int((v).size())
#define ALL(v) (v).begin(), (v).end()

using namespace std;

typedef long long ll;
typedef pair<int, int> pi;
typedef V<int> vi;

const int INF = 1e9 + 7, N = 1e5 + 7;
const ll oo = 1e18;

ll a[N];
int n;

namespace cover {
	int t[N * 4], tag[N * 4];
	int sum(int v, int len) {
		return tag[v] ? len : t[v];
	}
	void add(int l, int r, int x, int v = 1, int tl = 1, int tr = n + 1) {
		if(l <= tl && tr <= r) {
			tag[v] += x;
			return;
		}
		int tm = (tl + tr) / 2;
		if(l < tm) add(l, r, x, v * 2, tl, tm);
		if(r > tm) add(l, r, x, v * 2 + 1, tm, tr);
		t[v] = sum(v * 2, tm - tl) + sum(v * 2 + 1, tr - tm);
	}
	int qry(int l, int r, int v = 1, int tl = 1, int tr = n + 1) {
		if(l <= tl && tr <= r)
			return sum(v, tr - tl);
		int tm = (tl + tr) / 2, res = 0;
		if(l < tm) res += qry(l, r, v * 2, tl, tm);
		if(r > tm) res += qry(l, r, v * 2 + 1, tm, tr);
		return res;
	}
}

namespace seg {
	struct node {
		V<pair<int, ll>> bad_pref, bad_suff;
		V<pi> bad_seg;
		ll sum;
	} t[N * 4];
	void pull(int v, int posl = INF, int posr = 0) {
		t[v].bad_pref = t[v * 2].bad_pref;
		t[v].bad_suff = t[v * 2 + 1].bad_suff;

		for(auto[pos, sum]:t[v * 2 + 1].bad_pref) if(sum + t[v * 2].sum < a[pos + 1])
			t[v].bad_pref.EB(pos, sum + t[v * 2].sum);
		for(auto[pos, sum]:t[v * 2].bad_suff) if(sum + t[v * 2 + 1].sum < a[pos - 1])
			t[v].bad_suff.EB(pos, sum + t[v * 2 + 1].sum);

		int szi = SZ(t[v * 2].bad_suff);
		int szj = SZ(t[v * 2 + 1].bad_pref);
		int i = 0, j = 0;
		while(i < szi && t[v * 2].bad_suff[i].F > posl)
			i++;
		while(j < szj && t[v * 2 + 1].bad_pref[j].F < posr)
			j++;
		while(i < szi && j < szj) {
			auto& he = t[v * 2].bad_suff[i], be = t[v * 2 + 1].bad_pref[j];
			if(he.S + be.S < min(a[he.F - 1], a[be.F + 1])) {
				t[v].bad_seg.EB(he.F, be.F);
				cover::add(he.F, be.F + 1, 1);
			}
			if(a[he.F - 1] < a[be.F + 1])
				i++;
			else
				j++;
		}
		t[v].sum = t[v * 2].sum + t[v * 2 + 1].sum;
	}
	void build(int v = 1, int tl = 1, int tr = n + 1) {
		if(tr - tl == 1) {
			t[v].sum = a[tl];
			if(a[tl] < a[tl + 1])
				t[v].bad_pref.EB(tl, a[tl]);
			if(a[tl] < a[tl - 1])
				t[v].bad_suff.EB(tl, a[tl]);
			if(a[tl] < a[tl + 1] && a[tl] < a[tl - 1]) {
				t[v].bad_seg.EB(tl, tl);
				cover::add(tl, tl + 1, 1);
			}
		} else {
			int tm = (tl + tr) / 2;
			build(v * 2, tl, tm);
			build(v * 2 + 1, tm, tr);
			pull(v);
		}
	}
	void upd(int pos, int v = 1, int tl = 1, int tr = n + 1) {
		V<pi> tt;
		for(auto[l, r]:t[v].bad_seg) {
			if(r < pos - 1 || l > pos + 1) {
				tt.EB(l, r);
				continue;
			}
			cover::add(l, r + 1, -1);
		}
		t[v].bad_seg = tt, t[v].bad_pref.clear(), t[v].bad_suff.clear();

		if(tr - tl == 1) {
			t[v].sum = a[tl];
			if(a[tl] < a[tl + 1])
				t[v].bad_pref.EB(tl, a[tl]);
			if(a[tl] < a[tl - 1])
				t[v].bad_suff.EB(tl, a[tl]);
			if(a[tl] < a[tl + 1] && a[tl] < a[tl - 1]) {
				t[v].bad_seg.EB(tl, tl);
				cover::add(tl, tl + 1, 1);
			}
		} else {
			int tm = (tl + tr) / 2;
			if(pos - 1 < tm)
				upd(pos, v * 2, tl, tm);
			if(pos + 1 >= tm)
				upd(pos, v * 2 + 1, tm, tr);
			pull(v, pos + 1, pos - 1);
		}
	}
}

void upd(int pos, ll val) {
	a[pos] = val;
	seg::upd(pos);
}

signed main()
{
	IO_OP;

	cin >> n;
	a[0] = a[n + 1] = oo;
	for(int i = 1; i <= n; i++)
		cin >> a[i];

	seg::build();

	int q;
	cin >> q;
	while(q--) {
		int op;
		cin >> op;
		if(op == 1) {
			int x, y;
			cin >> x >> y;
			upd(x, y);
		} else {
			int l, r;
			cin >> l >> r;
			ll tl = a[l - 1], tr = a[r + 1];

			if(l - 1 >= 1) upd(l - 1, 1e15);
			if(r + 1 <= n) upd(r + 1, 1e15);
			cover::add(1, n + 1, -1);
			if(l != 1 || r != n)
				cover::add(l, r + 1, -1);

			cout << r - l + 1 - cover::qry(l, r + 1) << '\n';

			cover::add(1, n + 1, 1);
			if(l != 1 || r != n)
				cover::add(l, r + 1, 1);

			if(l - 1 >= 1) upd(l - 1, tl);
			if(r + 1 <= n) upd(r + 1, tr);
		}
	}

}

Compilation message (stderr)

fish2.cpp: In function 'void seg::pull(int, int, int)':
fish2.cpp:61:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   61 |   for(auto[pos, sum]:t[v * 2 + 1].bad_pref) if(sum + t[v * 2].sum < a[pos + 1])
      |           ^
fish2.cpp:63:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   63 |   for(auto[pos, sum]:t[v * 2].bad_suff) if(sum + t[v * 2 + 1].sum < a[pos - 1])
      |           ^
fish2.cpp: In function 'void seg::upd(int, int, int, int)':
fish2.cpp:106:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  106 |   for(auto[l, r]:t[v].bad_seg) {
      |           ^

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 12 / 12
• Subtask 4: 0 / 23
• Subtask 5: 35 / 35
• Subtask 6: 0 / 17