oj.uz

Submission #803067

# Submission time Handle Problem Language Result Execution time Memory
803067 2023-08-02T21:03:56 Z APROHACK Sky Walking (IOI19_walk) C++17
10 / 100
 4000 ms 1017992 KB 
#include "walk.h"
#include <bits/stdc++.h>
#define ll long long
#define ff first
#define ss second
#define pb push_back
using namespace std;
struct skywalk{
	ll l, r, y;
};
vector<pair<ll, ll>>buildings;
vector<skywalk>skywalks;
map<pair<ll, ll>, ll>intersecciones;
vector<pair<ll, ll>>puntosEnB[100005]; // los puntos de cada building
// la memoria se podria optimizar.

ll puntoCur = 0;
vector<pair<ll, ll> >adj[3000000]; // distancia, nodo
int n, m;
vector<pair<ll, ll>>corresponde;

ll generateinterseccion(ll build, ll y){
	if(intersecciones.count({buildings[build].ff, y})==1)return intersecciones[{buildings[build].ff, y}];
	corresponde.pb({buildings[build].ff, y});
	puntosEnB[build].pb({buildings[build].ff, y});
	intersecciones[{buildings[build].ff, y}] = puntoCur ++;
	return puntoCur - 1;
}
void unir(ll a, ll b, ll distancia){
	distancia = abs(distancia);
	adj[a].pb({distancia, b});
	adj[b].pb({distancia, a});
}

void getI(ll l, ll r, ll y){
	ll anterior = generateinterseccion(l, y), actual;
	ll antX = buildings[l].ff;
	for(ll i = l+1 ; i <= r ; i ++){
		if(buildings[i].ss >= y){
			actual = generateinterseccion(i, y);
			unir(anterior, actual, buildings[i].ff - antX);
			anterior = actual;
			antX = buildings[i].ff;
		}
	}
}

ll dijkstra(ll s, ll g){
	priority_queue<pair<ll, ll>>pq;
	pq.push({0, s});
	ll distancias[puntoCur+1];
	for(ll i = 0 ; i < puntoCur ; i ++){
		distancias[i] = LLONG_MAX;
	}
	distancias[s] = 0;
	while(!pq.empty()){
		pair<ll, ll>cur = pq.top();
		pq.pop();
		cur.ff = -cur.ff;
		//if(cur.ss == g)return distancias[g];
		if(distancias[cur.ss] < cur.ff)continue;
		//cout << "arrived " << cur.ss << endl;
		for(ll i = 0 ; i < adj[cur.ss].size() ; i ++){
			auto nxt = adj[cur.ss][i];
			//cout << "can go " << corresponde[nxt.ss].ff << ", " << corresponde[nxt.ss].ss << endl;
			//cout << nxt.ff + cur.ff << " < " << distancias[nxt.ss] << endl; 
			if(nxt.ff + cur.ff < distancias[nxt.ss]){
				distancias[nxt.ss] = nxt.ff + cur.ff;
				pq.push({-distancias[nxt.ss], nxt.ss});
			}
		}
	}
	if(distancias[g] == LLONG_MAX)distancias[g] = -1;
	return distancias[g];
}

long long min_distance(std::vector<int> x, std::vector<int> h, std::vector<int> l, std::vector<int> r, std::vector<int> y, int s, int g) {
	n = x.size();
	m = l.size();
	for(ll i = 0 ; i < n ; i ++){
		buildings.pb({x[i], h[i]});
	}
	for(ll i = 0 ; i < m ; i ++){
		skywalks.pb({l[i], r[i], y[i]});
	}
	for(ll i = 0 ; i < n ; i ++){
		generateinterseccion(i, 0);
		//puntosEnB[i].pb({x[i], 0});
		//intersecciones[{x[i], 0}] = puntoCur++;
	}
	for(ll i = 0 ; i < m ; i++){
		getI(l[i], r[i], y[i]);
	}
	for(ll i = 0 ; i < n ; i ++){
		sort(puntosEnB[i].begin(), puntosEnB[i].end());
		for (ll j = 1 ; j < puntosEnB[i].size() ; j ++){
			unir(intersecciones[puntosEnB[i][j-1]], intersecciones[puntosEnB[i][j]], puntosEnB[i][j].ss - puntosEnB[i][j-1].ss);
		}
	}
	//for(ll i = 0 ; i < puntoCur ; i ++){
	//	cout << i << " = " << corresponde[i].ff << ", " << corresponde[i].ss << endl;
	//}
	return dijkstra(intersecciones[{x[s], 0}], intersecciones[{x[g], 0}]);
}

Compilation message

walk.cpp: In function 'long long int dijkstra(long long int, long long int)':
walk.cpp:63:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |   for(ll i = 0 ; i < adj[cur.ss].size() ; i ++){
      |                  ~~^~~~~~~~~~~~~~~~~~~~
walk.cpp: In function 'long long int min_distance(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, int, int)':
walk.cpp:96:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   96 |   for (ll j = 1 ; j < puntosEnB[i].size() ; j ++){
      |                   ~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 31 ms 73036 KB Output is correct
2 Correct 31 ms 73096 KB Output is correct
3 Correct 32 ms 73088 KB Output is correct
4 Correct 37 ms 73080 KB Output is correct
5 Correct 31 ms 73244 KB Output is correct
6 Correct 32 ms 73212 KB Output is correct
7 Correct 34 ms 73328 KB Output is correct
8 Correct 32 ms 73172 KB Output is correct
9 Correct 32 ms 73096 KB Output is correct
10 Correct 38 ms 73200 KB Output is correct
11 Correct 32 ms 73012 KB Output is correct
12 Correct 32 ms 73112 KB Output is correct
13 Correct 32 ms 73072 KB Output is correct
14 Correct 31 ms 73076 KB Output is correct
15 Correct 32 ms 73044 KB Output is correct
16 Correct 34 ms 73152 KB Output is correct
17 Correct 32 ms 73300 KB Output is correct

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 31 ms 73076 KB Output is correct
2 Correct 32 ms 73136 KB Output is correct
3 Correct 1064 ms 241332 KB Output is correct
4 Correct 1114 ms 249928 KB Output is correct
5 Correct 810 ms 226196 KB Output is correct
6 Correct 1061 ms 208244 KB Output is correct
7 Correct 833 ms 226368 KB Output is correct
8 Correct 1406 ms 287472 KB Output is correct
9 Correct 895 ms 224628 KB Output is correct
10 Correct 1563 ms 319460 KB Output is correct
11 Correct 561 ms 162088 KB Output is correct
12 Correct 393 ms 135676 KB Output is correct
13 Correct 1392 ms 287992 KB Output is correct
14 Correct 2054 ms 132964 KB Output is correct
15 Correct 1258 ms 134964 KB Output is correct
16 Correct 472 ms 135448 KB Output is correct
17 Correct 421 ms 133268 KB Output is correct
18 Execution timed out 4048 ms 109480 KB Time limit exceeded
19 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 114 ms 90392 KB Output is correct
2 Runtime error 2685 ms 1017992 KB Execution killed with signal 6
3 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 114 ms 90392 KB Output is correct
2 Runtime error 2685 ms 1017992 KB Execution killed with signal 6
3 Halted 0 ms 0 KB -

Subtask #5
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 31 ms 73036 KB Output is correct
2 Correct 31 ms 73096 KB Output is correct
3 Correct 32 ms 73088 KB Output is correct
4 Correct 37 ms 73080 KB Output is correct
5 Correct 31 ms 73244 KB Output is correct
6 Correct 32 ms 73212 KB Output is correct
7 Correct 34 ms 73328 KB Output is correct
8 Correct 32 ms 73172 KB Output is correct
9 Correct 32 ms 73096 KB Output is correct
10 Correct 38 ms 73200 KB Output is correct
11 Correct 32 ms 73012 KB Output is correct
12 Correct 32 ms 73112 KB Output is correct
13 Correct 32 ms 73072 KB Output is correct
14 Correct 31 ms 73076 KB Output is correct
15 Correct 32 ms 73044 KB Output is correct
16 Correct 34 ms 73152 KB Output is correct
17 Correct 32 ms 73300 KB Output is correct
18 Correct 31 ms 73076 KB Output is correct
19 Correct 32 ms 73136 KB Output is correct
20 Correct 1064 ms 241332 KB Output is correct
21 Correct 1114 ms 249928 KB Output is correct
22 Correct 810 ms 226196 KB Output is correct
23 Correct 1061 ms 208244 KB Output is correct
24 Correct 833 ms 226368 KB Output is correct
25 Correct 1406 ms 287472 KB Output is correct
26 Correct 895 ms 224628 KB Output is correct
27 Correct 1563 ms 319460 KB Output is correct
28 Correct 561 ms 162088 KB Output is correct
29 Correct 393 ms 135676 KB Output is correct
30 Correct 1392 ms 287992 KB Output is correct
31 Correct 2054 ms 132964 KB Output is correct
32 Correct 1258 ms 134964 KB Output is correct
33 Correct 472 ms 135448 KB Output is correct
34 Correct 421 ms 133268 KB Output is correct
35 Execution timed out 4048 ms 109480 KB Time limit exceeded
36 Halted 0 ms 0 KB -