Submission #828901

#	Time	Username	Problem	Language	Result	Execution time	Memory
828901		QwertyPi	The short shank; Redemption (BOI21_prison)	C++14	10 / 100	116 ms	62992 KiB

prison

#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")

using namespace std;

const int N = 2e6 + 11;
const int MAXN = 2e6 + 11;
int a[N];
vector<int> rm[N];

struct range{
	int l, r;
};

struct BIT{
    int bit[MAXN];
    void add(int p, int v){ p++; for(int i = p; i < MAXN; i += i & -i) bit[i] += v; }
    int qry(int p){ p++; int r = 0; for(int i = p; i; i -= i & -i) r += bit[i]; return r; }
} bit;

int32_t main(){
	cin.tie(0); cout.tie(0)->sync_with_stdio(false);
	int n, d, t; cin >> n >> d >> t;
	for(int i = 0; i < n; i++){
		cin >> a[i]; a[i] = max(0, t - a[i] + 1);
	}
	for(int i = 0; i < n; i++){
		if(a[i] == 0) a[i] = -1;
		else a[i] = min(n, i + a[i]), rm[a[i]].push_back(i);
	}

	priority_queue<int> pq1, pq2;

	vector<range> R;
	int ans = 0;
	for(int i = 0; i < n; i++){
		for(auto j : rm[i]) pq2.push(j);
		while(pq1.size() && pq2.size() && pq1.top() == pq2.top()) pq1.pop(), pq2.pop();
		if(a[i] == -1){
			if(!pq1.empty()) R.push_back({pq1.top(), i - 1}), ans++;
		}else{
			pq1.push(i);
			ans++;
		}
	}
	for(auto [l, r] : R){
		bit.add(l, 1);
		bit.add(r + 1, -1);
	}

	int mx = -1;
	for(int i = 0; i < n; i++){
		mx = max(mx, bit.qry(i));
	}

	cout << ans - mx << endl;
}

Compilation message (stderr)

prison.cpp: In function 'int32_t main()':
prison.cpp:47:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   47 |  for(auto [l, r] : R){
      |           ^

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