Submission #672829

#	Time	Username	Problem	Language	Result	Execution time	Memory
672829		Kahou	The short shank; Redemption (BOI21_prison)	C++14	80 / 100	2120 ms	469748 KiB

prison

//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
/* In the name of God, aka Allah */
// let this be mytemp.cpp
#include<bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define endl '\n'
#define mk make_pair
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int inf = 1e9 + 50;
const int N = 2e6 + 5;
int n, d, t[N], T, b[N], L[N];
int seg[N<<2];
pii out[N<<2];
int ers[N<<2];
int lazy[N<<2];
vector<int> vc[N<<2];

void build(int u=1, int tl=1, int tr=n) {
	if (tl == tr) {
		seg[u] = inf;
		return;
	}
	int md = (tl+tr)/2;
	int lc = u<<1;
	int rc = u<<1|1;
	build(lc, tl, md), build(rc, md+1, tr);
	seg[u] = min(seg[lc], seg[rc]);
}

void upd(int id, int x, int u=1, int tl=1, int tr=n) {
	if (tl == tr) {
		seg[u] = min(seg[u], x);
		return;
	}
	int md = (tl+tr)/2;
	int lc = u<<1;
	int rc = u<<1|1;
	if (id <= md) upd(id, x, lc, tl, md);
	else upd(id, x, rc, md+1, tr);
	seg[u] = min(seg[lc], seg[rc]);
}
int get(int x, int u=1, int tl=1, int tr=n) {
	if (seg[u] > x) return 0;
	if (tl == tr) return tl;
	int md = (tl+tr)/2;
	int lc = u<<1;
	int rc = u<<1|1;
	int out = get(x, rc, md+1, tr);
	if (!out) out = get(x, lc, tl, md);
	return out;
}
void shift(int u) {
	int lc = u<<1;
	int rc = u<<1|1;
	out[lc].F += lazy[u];
	lazy[lc] += lazy[u];
	out[rc].F += lazy[u];
	lazy[rc] += lazy[u];
	lazy[u] = 0;
}
void build2(int u=1, int tl=1, int tr=n) {
	if (tl == tr) {
		out[u] = {0, tl};
		return;
	}
	int md = (tl+tr)/2;
	int lc = u<<1;
	int rc = u<<1|1;
	build2(lc, tl, md), build2(rc, md+1, tr);
	out[u] = max(out[lc], out[rc]);
}
void push(int l, int r, int id, int u =1, int tl=1, int tr=n) {
	if (l <= tl && tr <= r) {
		out[u].F++;
		lazy[u]++;
		vc[u].push_back(id);
		return;
	}
	shift(u);
	int md = (tl+tr)/2;
	int lc = u<<1;
	int rc = u<<1|1;
	if (l <= md) push(l, r, id, lc, tl, md);
	if (r > md) push(l, r, id, rc, md+1, tr);
	out[u] = max(out[lc], out[rc]);
}
void pop(int l, int r, int id, int u=1, int tl=1, int tr=n) {
	if (l <= tl && tr <= r) {
		out[u].F--;
		lazy[u]--;
		ers[u]++;
		return;
	}
	shift(u);
	int md = (tl+tr)/2;
	int lc = u<<1;
	int rc = u<<1|1;
	if (l <= md) pop(l, r, id, lc, tl, md);
	if (r > md) pop(l, r, id, rc, md+1, tr);
	out[u] = max(out[lc], out[rc]);
}
bool cmp (int x, int y) {
	pii A = {x-L[x], x};
	pii B = {y-L[y], y};
	return A < B;
}

int vx[N], sz, pt;
void getvc(int id, int u=1, int tl=1, int tr=n) {
	for (int i = (int)vc[u].size()-ers[u]-1; i >= 0; i--) {
		int x = vc[u][i];
		vx[sz++] = x;
	}
	if (tl == tr) return;
	int md = (tl+tr)/2;
	int lc = u<<1;
	int rc = u<<1|1;
	if (id <= md) getvc(id, lc, tl, md);
	else getvc(id, rc, md+1, tr);
}

void solve() {
	cin >> n >> d >> T;
	for (int i = 1; i <= n; i++) {
		cin >> t[i];
	}
	build();
	build2();
	int ans = 0;
	for (int i = 1; i <= n; i++) {
		upd(i, t[i]-i);
		L[i] = get(T-i)+1;
		if (L[i] > i) continue;
		if (L[i] <= 1) {
			ans++;
			continue;
		}
		push(L[i], i, i);
	}
	for (int i = 1; i <= d; i++) {
		ans += out[1].F;
		int id = out[1].S;
		getvc(id);
		for (int j = sz-1; j >= pt; j--) {
			int x = vx[j];
			pop(L[x], x, x);
		}
		pt = sz;
	}
	cout << n-ans << endl;
}
int main() {
	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	solve();
	return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 10 / 10
• Subtask 5: 25 / 25
• Subtask 6: 0 / 20