Submission #521773

#	Time	Username	Problem	Language	Result	Execution time	Memory
521773		amunduzbaev	IOI Fever (JOI21_fever)	C++14	69 / 100	5068 ms	438980 KiB

fever

#include "bits/stdc++.h"
using namespace std;
 
#define ar array
#define int long long

const int N = 1e5 + 5;
const int MAX = 1e18;
struct node{
	int a, b, p, t;
};

bool operator < (node y, node x){
	if(y.a + y.b == x.a + x.b) return y.a < x.a;
	return y.a + y.b < x.a + x.b;
}

node Min(node a, node b){
	if(a.a < b.a) return a;
	return b;
}

const int M = (1 << 18);

struct ST{
	vector<node> tree, mn;
	vector<int> p[2];
	//~ int p[2][1 << 18];
	
	void init(){
		p[0].resize(M, MAX), p[1].resize(M, -1);
		tree.resize(M), mn.resize(M);
		//~ memset(p[0], 127, sizeof p[0]);
		//~ memset(p[1], -1, sizeof p[1]);
	}
	
	void push(int x, int lx, int rx){
		if(lx == rx) return;
		if((node){mn[x<<1].a, p[0][x]} < tree[x<<1]){
			tree[x<<1] = {mn[x<<1].a, p[0][x], mn[x<<1].p, p[1][x]};
		} 
		if((node){mn[x<<1|1].a, p[0][x]} < tree[x<<1|1]){
			tree[x<<1|1] = {mn[x<<1|1].a, p[0][x], mn[x<<1|1].p, p[1][x]};
		} 
		if(p[0][x<<1] > p[0][x]) p[0][x<<1] = p[0][x], p[1][x<<1] = p[1][x];
		if(p[0][x<<1|1] > p[0][x]) p[0][x<<1|1] = p[0][x], p[1][x<<1|1] = p[1][x];
		p[0][x] = MAX;
		p[1][x] = -1;
	}
	
	void sett(int i, node v, int lx = 0, int rx = N, int x = 1){
		if(lx == rx) { tree[x] = mn[x] = v; return; }
		int m = (lx + rx) >> 1;
		push(x, lx, rx);
		if(i <= m) sett(i, v, lx, m, x<<1);
		else sett(i, v, m+1, rx, x<<1|1);
		tree[x] = min(tree[x<<1], tree[x<<1|1]);
		mn[x] = Min(mn[x<<1], mn[x<<1|1]);
	}
	
	void umin(int l, int r, int v, int t, int lx = 0, int rx = N, int x = 1){
		if(lx > r || rx < l) return;
		if(lx >= l && rx <= r){
			if((node){mn[x].a, v} < tree[x]) tree[x] = {mn[x].a, v, mn[x].p, t};
			if(p[0][x] > v){
				p[0][x] = v;
				p[1][x] = t;
			}
			return;
		} int m = (lx + rx) >> 1;
		push(x, lx, rx);
		umin(l, r, v, t, lx, m, x<<1),
		umin(l, r, v, t, m+1, rx, x<<1|1);
		tree[x] = min(tree[x<<1], tree[x<<1|1]);
		mn[x] = Min(mn[x<<1], mn[x<<1|1]);
	}
	
	ar<int, 3> get(int l, int r, int lx = 0, int rx = N, int x = 1){
		if(lx > r || rx < l) return {MAX + MAX, MAX, MAX};
		if(lx >= l && rx <= r) return {tree[x].a + tree[x].b, tree[x].p, tree[x].t};
		int m = (lx + rx) >> 1;
		push(x, lx, rx);
		return min(get(l, r, lx, m, x<<1), get(l, r, m+1, rx, x<<1|1));
	}
};

ar<int, 2> r[8][N];
int pos[8][N];
 
signed main(){
	ios::sync_with_stdio(0); cin.tie(0);
	
	int n; cin>>n;
	vector<ar<int, 2>> p(n);
	for(int i=0;i<n;i++) cin>>p[i][0]>>p[i][1];
	map<int, vector<int>> mm[8];
	for(int i=0;i<n;i++){
		mm[0][p[i][0] - p[i][1]].push_back(i);
		mm[1][p[i][0] - p[i][1]].push_back(i);
		mm[2][p[i][0] + p[i][1]].push_back(i);
		mm[3][p[i][0] + p[i][1]].push_back(i);
		mm[4][p[i][1]].push_back(i);
		mm[5][p[i][1]].push_back(i);
		mm[6][p[i][0]].push_back(i);
		mm[7][p[i][0]].push_back(i);
	}
	
	for(int t=0;t<8;t++){
		int last = 0;
		for(auto& [x, v] : mm[t]){
			sort(v.begin(), v.end(), [&](int i, int j){
				if(t < 6) return p[i][0] < p[j][0];
				return p[i][1] < p[j][1];
			});
			
			for(int i=0;i<(int)v.size();i++){
				r[t][v[i]] = {last, last + (int)v.size() - 1};
				pos[t][v[i]] = last + i;
			} last += v.size();
		}
	}
	
	auto get = [&](int i, int j){
		if(j%2 == 0 && j < 4) return 2 * p[i][0];
		if(j%2 == 1 && j < 4) return -2 * p[i][0];
		if(j == 4) return p[i][0];
		if(j == 5) return -p[i][0];
		if(j == 6) return p[i][1];
		if(j == 7) return -p[i][1];
		assert(0);
	};
	
	vector<ST> tree(8);
	for(int j=0;j<8;j++){
		tree[j].init();
		for(int i=0;i<n;i++){
			tree[j].sett(pos[j][i], {get(i, j), MAX, i, -1});
			//~ cout<<pos[j][i]<<" ";
		}
		
		//~ cout<<endl;
	}
	int ans = 0;
	auto is = [&](int a, int b, int t){
		return (abs(p[a][0] - p[b][0]) + abs(p[a][1] - p[b][1]) > t);
	};
	
	for(int t=0;t<4;t++){
		vector<ST> tmp = tree;
		
		for(int j=0;j<8;j++){
			tree[j].sett(pos[j][0], {get(0, j), -get(0, j), 0, t});
		}
		
		auto find = [&]() -> ar<int, 3>{
			ar<int, 3> r; r[0] = MAX;
			for(int j=0;j<8;j++){
				auto tt = tree[j].get(0, n - 1);
				if(tt[0] < r[0]) r = tt;
			}
			
			if(~r[2] && ~r[1]){
				for(int j=0;j<8;j++){
					tree[j].sett(pos[j][r[1]], {MAX, -1, -1, -1});
				}
			}
			return r;
		};
		
		int res = 0;
		while(1){
			//~ cout<<"here"<<endl;
			auto u = find();
			
			if(u[1] == -1 || u[2] == -1) break;
			res++;
			
			int i = u[1], t = u[2], tim = u[0];
			//~ cout<<i<<" "<<t<<" "<<tim<<endl;
			{
				auto& v = mm[0][p[i][0] - p[i][1]];
				if(t == 0 || t == 1){
					int lx = pos[0][i] - r[0][i][0], rx = (int)v.size() - 1;
					while(lx < rx){
						int m = (lx + rx) >> 1;
						if(is(i, v[m], tim)) rx = m;
						else lx = m + 1;
					} if(is(i, v[lx], tim)){
						lx += r[0][i][0], rx = r[0][i][1];
						tree[0].umin(lx, rx, -2 * p[i][0], (t == 0 ? 3 : 2));
					}
				} else {
					int lx = 0, rx = pos[1][i] - r[1][i][0];
					while(lx < rx){
						int m = (lx + rx + 1) >> 1;
						if(is(i, v[m], tim)) lx = m;
						else rx = m - 1;
					} if(is(i, v[lx], tim)){
						lx = r[1][i][0], rx += r[1][i][0];
						tree[1].umin(lx, rx, 2 * p[i][0], (t == 2 ? 1 : 0));
					}
				}
			}
			//~ cout<<"here"<<endl;
			{
				auto& v = mm[2][p[i][0] + p[i][1]];
				if(t == 1 || t == 2){
					int lx = pos[2][i] - r[2][i][0], rx = (int)v.size() - 1;
					while(lx < rx){
						int m = (lx + rx) >> 1;
						if(is(i, v[m], tim)) rx = m;
						else lx = m + 1;
					} if(is(i, v[lx], tim)){
						lx += r[2][i][0], rx = r[2][i][1];
						tree[2].umin(lx, rx, -2 * p[i][0], (t == 1 ? 0 : 3));
					}
				} else {
					int lx = 0, rx = pos[3][i] - r[3][i][0];
					while(lx < rx){
						int m = (lx + rx + 1) >> 1;
						if(is(i, v[m], tim)) lx = m;
						else rx = m - 1;
					} if(is(i, v[lx], tim)){
						lx = r[3][i][0], rx += r[3][i][0];
						tree[3].umin(lx, rx, 2 * p[i][0], (t == 0 ? 1 : 2));
					}
				}
			}
			//~ cout<<"here"<<endl;
			{
				auto& v = mm[4][p[i][1]];
				if(t == 1){
					int lx = pos[4][i] - r[4][i][0], rx = (int)v.size() - 1;
					while(lx < rx){
						int m = (lx + rx) >> 1;
						if(is(i, v[m], tim)) rx = m;
						else lx = m + 1;
					} if(is(i, v[lx], tim)){
						lx += r[4][i][0], rx = r[4][i][1];
						tree[4].umin(lx, rx, -p[i][0], 3);
					}
				} if(t == 3){
					int lx = 0, rx = pos[5][i] - r[5][i][0];
					while(lx < rx){
						int m = (lx + rx + 1) >> 1;
						if(is(i, v[m],  tim)) lx = m;
						else rx = m - 1;
					} if(is(i, v[lx], tim)){
						lx = r[5][i][0], rx += r[5][i][0];
						tree[5].umin(lx, rx, p[i][0], 1);
					}
				}
			}
			//~ cout<<"here"<<endl;
			{
				auto& v = mm[6][p[i][0]];
				if(t == 0){
					int lx = pos[6][i] - r[6][i][0], rx = (int)v.size() - 1;
					while(lx < rx){
						int m = (lx + rx) >> 1;
						if(is(i, v[m], tim)) rx = m;
						else lx = m + 1;
					} if(is(i, v[lx], tim)){
						lx += r[6][i][0], rx = r[6][i][1];
						tree[6].umin(lx, rx, -p[i][1], 2);
					}
				} if(t == 2){
					int lx = 0, rx = pos[7][i] - r[7][i][0];
					while(lx < rx){
						int m = (lx + rx + 1) >> 1;
						if(is(i, v[m],  tim)) lx = m;
						else rx = m - 1;
					} if(is(i, v[lx], tim)){
						lx = r[7][i][0], rx += r[7][i][0];
						tree[7].umin(lx, rx, p[i][1], 0);
					}
				}
			}
			
			//~ cout<<"here"<<endl;
		}
		swap(tmp, tree);
		ans = max(ans, res);
	}
	
	cout<<ans<<"\n";
}

Compilation message (stderr)

fever.cpp: In function 'int main()':
fever.cpp:110:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  110 |   for(auto& [x, v] : mm[t]){
      |             ^

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 6 / 6
• Subtask 4: 6 / 6
• Subtask 5: 12 / 12
• Subtask 6: 32 / 32
• Subtask 7: 0 / 31