Submission #838163

#	Time	Username	Problem	Language	Result	Execution time	Memory
838163		fatemetmhr	Passport (JOI23_passport)	C++17	6 / 100	60 ms	32908 KiB

passport

// na hanooz omidi vjood dare... hanooz ye karayi hast ke bknm :)

#include <bits/stdc++.h>

using namespace std;


#define debug(x) cerr << "(" << (#x) << "): " << (x) << endl;
#define all(x)   (x).begin(), (x).end()
#define fi       first
#define se       second
#define mp       make_pair
#define pb       push_back

typedef long long ll;

const int maxn5 = 2e5 + 10;
const int lg    = 20;

int suf[maxn5], pre[maxn5], ans[maxn5];
int l[maxn5], r[maxn5];
bool mark[maxn5];

namespace rmq{

	pair <int, int> mn[lg][maxn5];

	void build(int n){
		for(int i = 1; i < lg; i++) for(int j = 0; j + (1 << i) - 1 < n; j++)
			mn[i][j] = min(mn[i - 1][j], mn[i - 1][j + (1 << (i - 1))]);
	}

	pair <int, int> get_min(int l, int r){
		int k = 31 - __builtin_clz(r - l + 1);
		return min(mn[k][l], mn[k][r - (1 << k) + 1]);
	}
}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0);

	int n; cin >> n;
	for(int i = 0; i < n; i++){
		cin >> l[i] >> r[i];
		l[i]--; r[i]--;
		rmq::mn[0][i] = {l[i], i};
	}
	rmq::build(n);
	fill(pre, pre + n + 5, maxn5);
	fill(suf, suf + n + 5, maxn5);
	pre[0] = 0;
	for(int i = 1; i < n; i++){
		int v = rmq::get_min(l[i], r[i]).se;
		pre[i] = pre[v] + 1;
		if(l[i] == 0)
			pre[i] = 0;
	}
	for(int i = 0; i < n; i++)
		rmq::mn[0][i] = {-r[i], i};
	rmq::build(n);
	suf[n - 1] = 0;
	ans[n - 1] = min(maxn5, pre[n - 1]);
	for(int i = n - 2; i >= 0; i--){
		int v = rmq::get_min(l[i], r[i]).se;
		suf[i] = suf[v] + 1;
		if(r[i] == n - 1)
			suf[i] = 0;
		ans[i] = min(maxn5, pre[i] + suf[i]);
	}

	//debug(suf[4]);
	//debug(pre[4]);
	//debug(ans[4]);
	/*
	while(true){
		int v = -1;
		for(int i = 0; i < n; i++) if(!mark[i] && (v == -1 || ans[v] > ans[i]))
			v = i;
		if(v == -1)
			break;
		mark[v] = true;
		//debug(v);
		//debug(ans[v]);
		for(int i = 0; i < n; i++) 
			if(l[i] <= v && v <= r[i] && ans[i] > ans[v] + 1)
				ans[i] = ans[v] + 1;
		//debug(ans[4]);
	}
	*/

	int q; cin >> q;
	for(int i = 0; i < q; i++){
		int x; cin >> x;
		x--;
		cout << (ans[x] >= maxn5 ? -1 : ans[x] + 1) << '\n';
	}

}

• Subtask 1: 6 / 6
• Subtask 2: 0 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 8
• Subtask 5: 0 / 46