oj.uz

답안 #436541

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
436541 2021-06-24T15:16:25 Z rqi Sky Walking (IOI19_walk) C++14
24 / 100
 3542 ms 358216 KB 
    #include "walk.h"
    #include <bits/stdc++.h>
    using namespace std;
     
    typedef vector<int> vi;
    typedef pair<int, int> pi;
    typedef vector<pi> vpi;
    typedef long long ll;
    typedef vector<ll> vl;
     
    #define f first
    #define s second
    #define mp make_pair
    #define pb push_back
    #define bk back()
    #define ins insert
    #define lb lower_bound
     
    #define sz(x) (int)(x).size()
    #define all(x) begin(x), end(x)
     
    const ll INF = 1e18;
     
    int n, m;
     
    const int mx = 100005;
    vector<pair<int, ll>> adj[2000005];
    ll dij[2000005];
     
    ll solveShort(int N, int A, int B){
    	for(int i = 0; i < N; i++){
    		dij[i] = INF;
    	}
     
    	priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll, int>>> pq;
    	dij[A] = 0;
    	pq.push(mp(dij[A], A));
     
    	while(sz(pq)){
    		ll d = pq.top().f;
    		int node = pq.top().s;
    		pq.pop();
    		if(dij[node] < d) continue;
    		for(auto u: adj[node]){
    			ll new_d = d+u.s;
    			if(dij[u.f] <= new_d) continue;
    			dij[u.f] = new_d;
    			pq.push(mp(dij[u.f], u.f));
    		}
    	}
     
    	if(dij[B] == INF) return -1;
    	return dij[B];
    }
     
    ll min_distance(vi x, vi h, vi l, vi r, vi y, int s, int g) {
    	n = sz(x);
    	m = sz(l);
     
     
    	if(s == 0 && g == n-1){
    		// cout << "HI" << "\n";
    		// cout.flush();
    		vi ending_at[mx];
    		for(int i = 0; i < m; i++){
    			ending_at[r[i]].pb(i);
    		}
    		vi starting_at[mx];
    		for(int i = 0; i < m; i++){
    			starting_at[l[i]].pb(i);
    		}
     
    		ending_at[0].pb(m);
    		starting_at[n-1].pb(m+1);
    		l.pb(0);
    		r.pb(0);
    		l.pb(n-1);
    		r.pb(n-1);
     
    		y.pb(0);
    		y.pb(0);

    		// for(int i = 0; i < sz(y); i++){
    		// 	cout << i << " " << y[i] << "\n";
    		// }
     
    		vector<pair<pi, ll>> eds;
     
    		set<pi> cur_sky_heights; // height, sky index
    		cur_sky_heights.ins(mp(y[m], m));
    		for(int i = 0; i < n; i++){
    			//do updates
    			for(auto sky: ending_at[i]){
    				cur_sky_heights.erase(mp(y[sky], sky));
    			}
    			for(auto sky: starting_at[i]){
    				cur_sky_heights.ins(mp(y[sky], sky));
    			}

    			// cout << "i=" << i << "\n";
    			// for(auto u: cur_sky_heights){
    			// 	cout << u.f << " " << u.s << "\n";
    			// }
     
    			for(auto sky: ending_at[i]){
    				auto it_above = cur_sky_heights.lb(mp(y[sky], 0));
    				auto it_below = cur_sky_heights.lb(mp(y[sky]+1, 0));
     
    				if(it_above != cur_sky_heights.end()){
    					int to_sky = it_above->s;
    					eds.pb(mp(mp(sky, to_sky), abs(y[sky]-y[to_sky])));
    				}
    				if(it_below != cur_sky_heights.begin()){
    					it_below = prev(it_below);
    					int to_sky = it_below->s;
    					eds.pb(mp(mp(sky, to_sky), abs(y[sky]-y[to_sky])));
    				}
    			}
    		}
     
    		for(auto u: eds){
    			// cout << u.f.f << " " << u.f.s << " " << u.s << "\n";
    			adj[u.f.f].pb(mp(u.f.s, u.s));
    		}
     
    		//m is source, m+1 is sink
    		return x[n-1]-x[0]+solveShort(m+2, m, m+1);
    	}
     
    	vi sort_by_y;
    	for(int i = 0; i < m; i++){
    		sort_by_y.pb(i);
    	}
    	sort(all(sort_by_y), [&](const int& a, const int& b){
    		return y[a] > y[b];
    	});
     
    	vi sort_by_h;
    	for(int i = 0; i < n; i++){
    		sort_by_h.pb(i);
    	}
    	sort(all(sort_by_h), [&](const int& a, const int& b){
    		return h[a] > h[b];
    	});
     
    	set<int> active_buildings;
     
    	int sort_by_h_ind = 0;
     
    	vector<pair<pi, pi>> point_eds; //building index, height
     
     
    	// cout << "HI" << "\n";
    	// cout.flush();
    	for(auto sky: sort_by_y){
    		while(sort_by_h_ind < sz(sort_by_h)){
    			int building_ind = sort_by_h[sort_by_h_ind];
    			if(h[building_ind] >= y[sky]){
    				active_buildings.ins(building_ind);
    				sort_by_h_ind++;
    			}
    			else{
    				break;
    			}
    		}
     
    		auto it = active_buildings.lb(l[sky]);
    		assert(*it == l[sky]);
     
    		while(true){
    			assert(next(it) != active_buildings.end());
    			point_eds.pb(mp(mp(*it, y[sky]), mp(*next(it), y[sky])));
     
    			if(*next(it) == r[sky]) break;
     
    			it = next(it);
    		}
    	}
     
     
    	// cout << "HI" << "\n";
    	// cout.flush();
    	set<int> each_building[mx]; //sky walk heights for each building
    	for(auto u: point_eds){
    		// cout << u.f.f << " " << u.f.s << " " << u.s.f << " " << u.s.s << "\n";
    		each_building[u.f.f].ins(u.f.s);
    		each_building[u.s.f].ins(u.s.s);
    	}
     
    	for(int i = 0; i < n; i++){
    		each_building[i].ins(0);
    		each_building[i].ins(h[i]);
    	}
     
    	for(int i = 0; i < n; i++){
    		auto it = each_building[i].begin();
    		while(next(it) != each_building[i].end()){
     
    			int y1 = *it;
    			int y2 = *next(it);
    			point_eds.pb(mp(mp(i, y1), mp(i, y2)));
     
    			it = next(it);
    		}
    	}
     
    	map<pi, int> compress;
    	vpi all_nodes;
    	for(auto u: point_eds){
    		all_nodes.pb(u.f);
    		all_nodes.pb(u.s);
    	}
    	int cnt = 0;
    	for(auto u: all_nodes){
    		if(!compress.count(u)){
    			compress[u] = cnt;
    			cnt++;
    		}
    	}
     
    	// for(auto u: point_eds){
    	// 	cout << u.f.f << " " << u.f.s << " " << u.s.f << " " << u.s.s << "\n";
    	// }
    	for(auto u: point_eds){
    		ll dist = INF;
    		if(u.f.f == u.s.f){
    			dist = abs(u.s.s-u.f.s);
    		}
    		else{
    			assert(u.s.s == u.f.s);
    			dist = abs(x[u.s.f]-x[u.f.f]);
    		}
    		int a = compress[u.f];
    		int b = compress[u.s];
    		adj[a].pb(mp(b, dist));
    		adj[b].pb(mp(a, dist));
     
    		// cout << a << " " << b << " " << dist << "\n";
    	}
     
     
    	return solveShort(cnt, compress[mp(s, 0)], compress[mp(g, 0)]);
    }

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 30 ms 54212 KB Output is correct
2 Correct 30 ms 54256 KB Output is correct
3 Correct 36 ms 54328 KB Output is correct
4 Correct 33 ms 54332 KB Output is correct
5 Correct 32 ms 54448 KB Output is correct
6 Correct 31 ms 54476 KB Output is correct
7 Correct 30 ms 54432 KB Output is correct
8 Correct 31 ms 54340 KB Output is correct
9 Correct 31 ms 54300 KB Output is correct
10 Correct 31 ms 54540 KB Output is correct
11 Correct 30 ms 54376 KB Output is correct
12 Correct 31 ms 54292 KB Output is correct
13 Correct 30 ms 54288 KB Output is correct
14 Correct 39 ms 54324 KB Output is correct
15 Correct 30 ms 54296 KB Output is correct
16 Correct 30 ms 54220 KB Output is correct
17 Correct 31 ms 54248 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 32 ms 54252 KB Output is correct
2 Correct 31 ms 54304 KB Output is correct
3 Correct 2738 ms 243996 KB Output is correct
4 Correct 2369 ms 278356 KB Output is correct
5 Correct 1843 ms 249648 KB Output is correct
6 Correct 1585 ms 227776 KB Output is correct
7 Correct 1694 ms 249844 KB Output is correct
8 Correct 3542 ms 295288 KB Output is correct
9 Correct 2004 ms 244472 KB Output is correct
10 Correct 3531 ms 358216 KB Output is correct
11 Correct 1319 ms 162768 KB Output is correct
12 Correct 182 ms 70152 KB Output is correct
13 Correct 215 ms 72748 KB Output is correct
14 Correct 596 ms 132508 KB Output is correct
15 Correct 676 ms 124520 KB Output is correct
16 Correct 686 ms 127152 KB Output is correct
17 Correct 720 ms 125136 KB Output is correct
18 Correct 163 ms 64904 KB Output is correct
19 Correct 68 ms 57664 KB Output is correct
20 Correct 260 ms 88204 KB Output is correct
21 Correct 168 ms 68828 KB Output is correct
22 Correct 172 ms 71440 KB Output is correct
23 Correct 242 ms 70172 KB Output is correct
24 Correct 189 ms 70636 KB Output is correct
25 Correct 156 ms 69556 KB Output is correct

Subtask #3
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 85 ms 61368 KB Output is correct
2 Correct 189 ms 66336 KB Output is correct
3 Correct 186 ms 68868 KB Output is correct
4 Correct 248 ms 74828 KB Output is correct
5 Correct 274 ms 73988 KB Output is correct
6 Correct 233 ms 73884 KB Output is correct
7 Correct 140 ms 67212 KB Output is correct
8 Correct 172 ms 73976 KB Output is correct
9 Correct 240 ms 74152 KB Output is correct
10 Correct 168 ms 72228 KB Output is correct
11 Incorrect 51 ms 55812 KB Output isn't correct

Subtask #4
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 85 ms 61368 KB Output is correct
2 Correct 189 ms 66336 KB Output is correct
3 Correct 186 ms 68868 KB Output is correct
4 Correct 248 ms 74828 KB Output is correct
5 Correct 274 ms 73988 KB Output is correct
6 Correct 233 ms 73884 KB Output is correct
7 Correct 140 ms 67212 KB Output is correct
8 Correct 172 ms 73976 KB Output is correct
9 Correct 240 ms 74152 KB Output is correct
10 Correct 168 ms 72228 KB Output is correct
11 Incorrect 51 ms 55812 KB Output isn't correct

Subtask #5
0 / 43.0

# 결과 실행 시간 메모리 Grader output
1 Correct 30 ms 54212 KB Output is correct
2 Correct 30 ms 54256 KB Output is correct
3 Correct 36 ms 54328 KB Output is correct
4 Correct 33 ms 54332 KB Output is correct
5 Correct 32 ms 54448 KB Output is correct
6 Correct 31 ms 54476 KB Output is correct
7 Correct 30 ms 54432 KB Output is correct
8 Correct 31 ms 54340 KB Output is correct
9 Correct 31 ms 54300 KB Output is correct
10 Correct 31 ms 54540 KB Output is correct
11 Correct 30 ms 54376 KB Output is correct
12 Correct 31 ms 54292 KB Output is correct
13 Correct 30 ms 54288 KB Output is correct
14 Correct 39 ms 54324 KB Output is correct
15 Correct 30 ms 54296 KB Output is correct
16 Correct 30 ms 54220 KB Output is correct
17 Correct 31 ms 54248 KB Output is correct
18 Correct 32 ms 54252 KB Output is correct
19 Correct 31 ms 54304 KB Output is correct
20 Correct 2738 ms 243996 KB Output is correct
21 Correct 2369 ms 278356 KB Output is correct
22 Correct 1843 ms 249648 KB Output is correct
23 Correct 1585 ms 227776 KB Output is correct
24 Correct 1694 ms 249844 KB Output is correct
25 Correct 3542 ms 295288 KB Output is correct
26 Correct 2004 ms 244472 KB Output is correct
27 Correct 3531 ms 358216 KB Output is correct
28 Correct 1319 ms 162768 KB Output is correct
29 Correct 182 ms 70152 KB Output is correct
30 Correct 215 ms 72748 KB Output is correct
31 Correct 596 ms 132508 KB Output is correct
32 Correct 676 ms 124520 KB Output is correct
33 Correct 686 ms 127152 KB Output is correct
34 Correct 720 ms 125136 KB Output is correct
35 Correct 163 ms 64904 KB Output is correct
36 Correct 68 ms 57664 KB Output is correct
37 Correct 260 ms 88204 KB Output is correct
38 Correct 168 ms 68828 KB Output is correct
39 Correct 172 ms 71440 KB Output is correct
40 Correct 242 ms 70172 KB Output is correct
41 Correct 189 ms 70636 KB Output is correct
42 Correct 156 ms 69556 KB Output is correct
43 Correct 85 ms 61368 KB Output is correct
44 Correct 189 ms 66336 KB Output is correct
45 Correct 186 ms 68868 KB Output is correct
46 Correct 248 ms 74828 KB Output is correct
47 Correct 274 ms 73988 KB Output is correct
48 Correct 233 ms 73884 KB Output is correct
49 Correct 140 ms 67212 KB Output is correct
50 Correct 172 ms 73976 KB Output is correct
51 Correct 240 ms 74152 KB Output is correct
52 Correct 168 ms 72228 KB Output is correct
53 Incorrect 51 ms 55812 KB Output isn't correct