oj.uz

답안 #1045052

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1045052 2024-08-05T16:12:31 Z Alihan_8 Sky Walking (IOI19_walk) C++17
33 / 100
 837 ms 95396 KB 
#include "walk.h"

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define ar array
#define all(x) x.begin(), x.end()
#define ln '\n'

using i64 = long long;

template <class F, class S>
bool chmin(F &u, const S &v){
	bool flag = false;
	
	if ( u > v ){
		u = v; flag |= true;
	}
	
	return flag;
}

const i64 inf = 1e15;

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) {
	int n = x.size(), m = l.size();
	
	// subtask #3
	
	vector <vector<ar<int,3>>> H(n);
	
	vector <vector<int>> qry(n);
	
	for ( int i = 0; i < m; i++ ){
		H[l[i]].pb({1, y[i], i});
		H[r[i]].pb({0, y[i], i});
		qry[r[i]].pb(i);
	}
	
	y.pb(0), l.pb(0), r.pb(0); // start
	y.pb(0), l.pb(n - 1), r.pb(n - 1); // end
	
	qry[0].pb(m), qry[n - 1].pb(m + 1);
	
	vector <int> D(m + 2, -1), U(m + 2, -1);
	
	// m -> (0), m + 1 -> (n - 1)
	
	set <pair<int,int>> st;
	
	for ( int i = 0; i < n; i++ ){
		for ( auto &[t, u, j]: H[i] ){
			if ( t > 0 ){
				st.insert({u, j});
			} else if ( i + 1 < n ){ // for (n - 1, 0)
				st.erase({u, j});
			}
		}
		
		for ( auto &j: qry[i] ){
			auto it = st.lower_bound({y[j], -1});
			
			if ( it != st.end() ){
				U[j] = it -> second;
			}
			
			if ( it != st.begin() ){
				D[j] = prev(it) -> second;
			}
		}
	}
	
	//~ cout << "Up & Down : \n";
	//~ for ( int i = 0; i < m + 2; i++ ){
		//~ cout << U[i] << " " << D[i] << ln;
	//~ } cout << ln;
	
	vector <vector<int>> rng(m + 2);
	
	for ( int i = 0; i < m + 2; i++ ){
		rng[i].pb(l[i]);
		rng[i].pb(r[i]);
		
		if ( U[i] == i ) U[i] = -1;
		if ( D[i] == i ) D[i] = -1;
		
		if ( U[i] != -1 ){
			rng[U[i]].pb(r[i]);
		}
		
		if ( D[i] != -1 ){
			rng[D[i]].pb(r[i]);
		}
	}
	
	map <ar<int,2>,int> id;
	
	vector <vector<ar<i64,2>>> adj;
	
	int k = 0;
	
	auto get = [&](int u, int v){
		if ( !id.count({u, v}) ){
			id[{u, v}] = k++;
			adj.pb(vector <ar<i64,2>>());
		}
		
		return id[{u, v}];
	};
	
	for ( int i = 0; i < m + 2; i++ ){
		auto &p = rng[i];
		
		sort(all(p));
		p.resize(unique(all(p)) - p.begin());
		
		{ // assigning index
			for ( auto x: p ) get(x, y[i]); 
		}
		
		for ( int j = 0; j + 1 < (int)p.size(); j++ ){
			int u = get(p[j], y[i]), v = get(p[j + 1], y[i]);
			
			adj[u].pb({v, x[p[j + 1]] - x[p[j]]}); // to the right
			adj[v].pb({u, x[p[j + 1]] - x[p[j]]});
			
			//~ cout << "{" << p[j] << " " << y[i] << "}  {" << p[j + 1] << " " << y[i] << "}  " << x[p[j + 1]] - x[p[j]] << ln;
		}
		
		if ( D[i] != -1 ){ // down
			int u = get(r[i], y[i]), v = get(r[i], y[D[i]]);
			
			//~ cout << "{" << r[i] << " " << y[i] << "}  {" << r[i] << " " << y[D[i]] << "}  " << y[i] - y[D[i]] << ln; 
			
			adj[u].pb({v, y[i] - y[D[i]]});
			adj[v].pb({u, y[i] - y[D[i]]});
		} 
		
		if ( U[i] != -1 ){ // up
			int u = get(r[i], y[i]), v = get(r[i], y[U[i]]);
			
			//~ cout << "{" << r[i] << " " << y[i] << "}  {" << r[i] << " " << y[U[i]] << "}  " << -y[i] + y[U[i]] << ln; 
			
			adj[u].pb({v, -y[i] + y[U[i]]});
			adj[v].pb({u, -y[i] + y[U[i]]});
		}
	}
	
	vector <i64> dp(k, inf);
	
	priority_queue <ar<i64,2>> q;
	
	int u = get(0, 0);
	
	dp[u] = 0;
	q.push({0, u});
	
	while ( !q.empty() ){
		auto [val, u] = q.top();
		q.pop();
		
		if ( -val != dp[u] ) continue;
		
		for ( auto &[v, w]: adj[u] ){
			if ( chmin(dp[v], dp[u] + w) ){
				q.push({-dp[v], v});
			}
		}
	}
	
	u = get(n - 1, 0);
	
	if ( dp[u] == inf ){
		dp[u] = -1;
	}
	
	return dp[u];
}

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 105 ms 21444 KB Output is correct
2 Correct 735 ms 80180 KB Output is correct
3 Correct 752 ms 84048 KB Output is correct
4 Correct 771 ms 92092 KB Output is correct
5 Correct 837 ms 95396 KB Output is correct
6 Correct 705 ms 85608 KB Output is correct
7 Correct 290 ms 51428 KB Output is correct
8 Correct 265 ms 53932 KB Output is correct
9 Correct 649 ms 78036 KB Output is correct
10 Correct 353 ms 64140 KB Output is correct
11 Correct 11 ms 4188 KB Output is correct

Subtask #4
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 105 ms 21444 KB Output is correct
2 Correct 735 ms 80180 KB Output is correct
3 Correct 752 ms 84048 KB Output is correct
4 Correct 771 ms 92092 KB Output is correct
5 Correct 837 ms 95396 KB Output is correct
6 Correct 705 ms 85608 KB Output is correct
7 Correct 290 ms 51428 KB Output is correct
8 Correct 265 ms 53932 KB Output is correct
9 Correct 649 ms 78036 KB Output is correct
10 Correct 353 ms 64140 KB Output is correct
11 Correct 11 ms 4188 KB Output is correct
12 Correct 764 ms 82256 KB Output is correct
13 Correct 678 ms 93096 KB Output is correct
14 Correct 814 ms 94372 KB Output is correct
15 Correct 534 ms 76960 KB Output is correct
16 Correct 546 ms 80508 KB Output is correct
17 Correct 641 ms 92576 KB Output is correct
18 Correct 518 ms 78244 KB Output is correct
19 Correct 565 ms 80732 KB Output is correct
20 Correct 301 ms 51060 KB Output is correct
21 Correct 22 ms 9564 KB Output is correct
22 Correct 518 ms 73376 KB Output is correct
23 Correct 484 ms 71240 KB Output is correct
24 Correct 404 ms 62100 KB Output is correct
25 Correct 431 ms 68404 KB Output is correct
26 Correct 369 ms 62108 KB Output is correct
27 Correct 823 ms 94372 KB Output is correct
28 Correct 616 ms 92840 KB Output is correct
29 Correct 723 ms 86380 KB Output is correct
30 Correct 308 ms 51812 KB Output is correct
31 Correct 550 ms 77864 KB Output is correct
32 Correct 323 ms 59736 KB Output is correct
33 Correct 336 ms 63336 KB Output is correct
34 Correct 368 ms 63900 KB Output is correct
35 Correct 421 ms 70064 KB Output is correct
36 Correct 328 ms 59512 KB Output is correct
37 Correct 282 ms 52852 KB Output is correct
38 Correct 402 ms 66476 KB Output is correct
39 Correct 413 ms 66632 KB Output is correct
40 Correct 357 ms 62380 KB Output is correct
41 Correct 318 ms 57156 KB Output is correct

Subtask #5
0 / 43.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -