Submission #1234494

#	Time	Username	Problem	Language	Result	Execution time	Memory
1234494		thelegendary08	Radio Towers (IOI22_towers)	C++17	23 / 100	4091 ms	12040 KiB

towers

#include "towers.h"
#include<bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define int long long
#define vi vector<int>
#define vvi vector<vector<int>>
#define pii pair<int, int>
#define vpii vector<pair<int, int>>
#define vc vector<char>
#define vb vector<bool>
#define mii map<int,int>
#define f0r(i,n) for(int i=0;i<n;i++)
#define FOR(i,k,n) for(int i=k;i<n;i++)
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define in(a) int a; cin>>a
#define in2(a,b) int a,b; cin>>a>>b
#define in3(a,b,c) int a,b,c; cin>>a>>b>>c
#define in4(a,b,c,d) int a,b,c,d; cin>>a>>b>>c>>d
#define vin(v,n); vi v(n); f0r(i,n){cin>>v[i];}
#define out(a) cout<<a<<'\n'
#define out2(a,b) cout<<a<<' '<<b<<'\n'
#define out3(a,b,c) cout<<a<<' '<<b<<' '<<c<<'\n'
#define out4(a,b,c,d) cout<<a<<' '<<b<<' '<<c<<' '<<d<<'\n'
#define vout(v) for(auto u : v){cout<<u<<' ';} cout<<'\n'
#define dout(a) cout<<a<<' '<<#a<<'\n'
#define dout2(a,b) cout<<a<<' '<<#a<<' '<<b<<' '<<#b<<'\n'
#define yn(x); if(x){cout<<"YES"<<'\n';}else{cout<<"NO"<<'\n';}
const int leg = 1e9 + 7;
const int mod = 998244353;
using namespace std;
vi V;
struct segtree{
	int n; vi mn, mx;
	segtree(vi v){
		n = v.size(); 
		mn.resize(4 * n + 5);
		mx.resize(4 * n + 5);
		build(1, 0, n-1, v);
	}
	void pull(int v){
		mn[v] = min(mn[v*2], mn[v*2+1]);
		mx[v] = max(mx[v*2], mx[v*2+1]);
	}
	void build(int v, int l, int r, vi &a){
		if(l == r){
			mn[v] = a[l];
			mx[v] = a[l];
			return;
		}
		int mid = (l + r) / 2;
		build(v*2, l, mid, a);
		build(v*2+1, mid+1, r, a);
		pull(v);
	}
	int firstlarger(int v, int tl, int tr, int l, int r, int d){
		if(tl > r || tr < l)return -1;
		if(mx[v] <= d)return -1;
		if(tl == tr)return tl;
		int tm = (tl + tr) / 2;
		int left = firstlarger(v*2, tl, tm, l, r, d);
		if(left != -1)return left;
		return firstlarger(v*2+1, tm+1, tr, l, r, d);
	}
	int leftlarger(int v, int tl, int tr, int l, int r, int d){
		if(tl > r || tr < l)return -1;
		if(mx[v] <= d)return -1;
		if(tl == tr)return tl;
		int tm = (tl + tr) / 2;
		int right = leftlarger(v*2+1, tm+1, tr, l, r, d);
		if(right != -1)return right;
		return leftlarger(v*2, tl, tm, l, r, d);
	}
	void update(int v, int tl, int tr, int d, int x){
		if(tl == tr){
			mn[v] = x; mx[v] = x; return;
		}
		int tm = (tl + tr) / 2;
		if(tm >= d){
			update(v*2, tl, tm, d, x);
		}
		else{
			update(v*2+1, tm+1, tr, d, x);
		}
		pull(v);
	}
	int maxquer(int v, int tl, int tr, int l, int r){
		if(l > r)return -4e18;
		if(tl == l && tr == r){
			return mx[v];
		}
		int tm = (tl + tr) / 2;
		return max(maxquer(v*2, tl, tm, l, min(r, tm)), maxquer(v*2+1, tm+1, tr, max(l, tm+1), r));
	}
	int minquer(int v, int tl, int tr, int l, int r){
		if(l > r)return 4e18;
		if(tl == l && tr == r){
			return mn[v];
		}
		int tm = (tl + tr) / 2;
		return min(minquer(v*2, tl, tm, l, min(r, tm)), minquer(v*2+1, tm+1, tr, max(l, tm+1), r));
	}
};
void init(signed N, std::vector<signed> H) {
	V.resize(N);
	f0r(i, N){
		V[i] = H[i];
	}
}

signed max_towers(signed L, signed R, signed D) {
	vi v;
	for(int i = L; i<=R; i++){
		v.pb(V[i]);
	}
	int n = v.size();
	segtree s = segtree(v);
	vpii pts;
	f0r(i,n){
		pts.pb(mp(v[i], i));
	}
	sort(all(pts));
	vi l(n);
	vi r(n);
	f0r(i,n){
		l[i] = s.leftlarger(1, 0, n-1, 0, i-1, v[i] + D - 1);
		if(l[i] == -1)l[i] = 0;
		r[i] = s.firstlarger(1, 0, n-1, i + 1, n-1, v[i] + D - 1);
		if(r[i] == -1)r[i] = n-1;
	}
	// vout(l);
	// vout(r);
	int ans = 0;
	f0r(i, n){
		int d = pts[i].second;
		bool ok = 1;
		if(l[d] != -1){
			if(s.minquer(1, 0, n-1, l[d], d) < v[d])ok = 0;
		}
		if(r[d] != -1){
			if(s.minquer(1, 0, n-1, d, r[d]) < v[d])ok = 0;
		}
		ans+=ok;
	}
	return ans;
	
  	return 0;
}

• Subtask 1: 0 / 4
• Subtask 2: 11 / 11
• Subtask 3: 12 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 17
• Subtask 6: 0 / 19
• Subtask 7: 0 / 23