Submission #931693

#	Time	Username	Problem	Language	Result	Execution time	Memory
931693		jcelin	Railway Trip 2 (JOI22_ho_t4)	C++14	100 / 100	520 ms	348248 KiB

Main

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

typedef pair<int,int> ii;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<ll> vll;
typedef vector<pll> vpll;

#define PB push_back
#define PF push_front
#define PPB pop_back
#define PPF pop_front
#define X first
#define Y second
#define MP make_pair
#define all(x) (x).begin(), (x).end()

const int mod = 1e9 + 7; //998244353;
const int inf = 1e9 + 7;
const ll INF = 1e18 + 7;
const int logo = 20;
const int MAXN = 2e5 + 7;
const int off = 1 << logo;
const int trsz = off << 1;
const int dx[] = {1, -1, 0, 0, -1, -1, 1, 1};
const int dy[] = {0, 0, -1, 1, 1, -1, 1, -1};


ii merge(ii a, ii b){
	return {min(a.X, b.X), max(a.Y, b.Y)};
}

struct t1{
	ii seg[trsz];
	
	
	t1(){
		fill(seg, seg + trsz, (ii){inf, -inf});
		for(int i=off+1; i<trsz; i++) seg[i] = {i - off, i - off};
	}
	
	void update(int l, int r, ii vl){
		for(l += off, r += off; l < r; l >>= 1, r >>= 1){
			if(l & 1) seg[l] = merge(seg[l], vl), l++;
			if(r & 1) --r, seg[r] = merge(seg[r], vl);
		}
	}
	
	ii query(int x){
		x += off;
		ii ret = seg[x];
		for(x /= 2; x; x /= 2) ret = merge(ret, seg[x]);
		return ret;
	}
}st;


struct sparse{
	ii seg[trsz];
	
	sparse(){
		for(int i=off; i<trsz; i++) seg[i] = {i - off, i - off};
	}
	
	void update(int x, ii vl){
		x += off;
		seg[x] = vl;
		for(x /= 2; x; x /= 2) seg[x] = merge(seg[x * 2], seg[x * 2 + 1]);
	}
	
	ii query(int l, int r){
		ii ret = {inf, -inf};
		for(l += off, r += off; l < r; l >>= 1, r >>= 1){
			if(l & 1) ret = merge(ret, seg[l++]);
			if(r & 1) ret = merge(ret, seg[--r]);
		}
		return ret;
	}
}t[logo];

void solve(){
	int n, m, k;
	cin >> n >> k >> m;
	while(m--){
		int l, r;
		cin >> l >> r;
		
		if(l < r){
			int li = l;
			int ri = min(l + k - 1, r);
			st.update(li, ri + 1, {inf, r});
		}else{
			swap(l, r);
			int li = max(r - k + 1, l);
			int ri  = r;
			st.update(li, ri + 1, {l, -inf});
		}
	}
	
	for(int i=1; i<=n; i++) t[0].update(i, st.query(i));
	
	for(int j=1; j<logo; j++) for(int i=1; i<=n; i++){
		ii pr = t[j - 1].query(i, i + 1);
		t[j].update(i, t[j - 1].query(pr.X, pr.Y + 1));
	}
	
	int q;
	cin >> q;
	while(q--){
		int u, v;
		cin >> u >> v;
		
		int ans = 0, l = u, r = u;
		for(int i=logo-1; i>=0; i--){
			ii nov = t[i].query(l, r + 1);
			if(!(nov.X <= v and nov.Y >= v)){
				ans += (1 << i);
				l = nov.X, r = nov.Y;
			}
		}
		
		if(ans > MAXN) cout << -1 << "\n";
		else cout << ans + 1 << "\n";
	}
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int tt = 1;
	//cin >> tt;
	while(tt--) solve();
	return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 11 / 11
• Subtask 4: 25 / 25
• Subtask 5: 35 / 35
• Subtask 6: 13 / 13