답안 #442785

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
442785	2021-07-09T04:46:54 Z	wind_reaper	Olympic Bus (JOI20_ho_t4)	C++17	100 / 100	127 ms	3688 KB

ho_t4

#include <bits/stdc++.h>
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
*/

using namespace std;
// using namespace __gnu_pbds;
using namespace chrono;

// mt19937 rng((int) std::chrono::steady_clock::now().time_since_epoch().count());
/*
template <class T> using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;
*/

//***************** CONSTANTS *****************

const int MXN = 200;
const int MXM = 50000;
const int64_t INF = 1'500'000'000'000'000;

//***************** GLOBAL VARIABLES *****************

vector<array<int, 2>> g[2][MXN];
int U[MXM], V[MXM], w[MXM], rev[MXM];
int N, M;

//***************** AUXILIARY STRUCTS *****************

void dijkstra(int S, int T, int idx, int64_t dist[], vector<bool>& used){
	int prev[N]; memset(prev, -1, sizeof prev);
	
	if(!idx)
		used.resize(M, false);
	
	vector<bool> vis(N, false);

	for(int i = 0; i <= N; i++) dist[i] = INF;
	dist[S] = 0;

	while(true){
		int u = N;
		for(int i = 0; i < N; i++)
			if(!vis[i] && dist[i] < dist[u])
				u = i;

		if(u == N)
			break;

		for(auto& [v, i] : g[idx][u])
			if(dist[v] > dist[u] + w[i])
				dist[v] = dist[u] + w[i], prev[v] = i;

		vis[u] = 1;
	}
	
	if(idx) return;

	for(int cur = T; prev[cur] != -1; cur = U[prev[cur]])
		used[prev[cur]] = 1;
}

int64_t dijkstra(int S, int T, int idx){
	vector<bool> vis(N, 0);
	int64_t dist[N + 1];
	for(int i = 0; i <= N; i++)
		dist[i] = INF;

	dist[S] = 0;

	while(true){
		int u = N;
		for(int i = 0; i < N; i++)
			if(!vis[i] && dist[i] < dist[u])
				u = i;

		if(u == N)
			break;

		for(auto& [v, i] : g[0][u])
			if(i != idx){
				dist[v] = min(dist[v], dist[u] + w[i]);
			}

		if(V[idx] == u)
			dist[U[idx]] = min(dist[U[idx]], dist[u] + w[idx]);

		vis[u] = 1;
	}

	return dist[T];
}

//***************** MAIN BODY *****************

void solve(){
	cin >> N >> M;

	for(int i = 0; i < M; i++){
		cin >> U[i] >> V[i] >> w[i] >> rev[i];
		--U[i], --V[i];
		g[0][U[i]].push_back({V[i], i});
		g[1][V[i]].push_back({U[i], i});
	}

	vector<bool> used[2], tmp;
	int64_t from[2][N + 1], to[2][N + 1];

	dijkstra(0, N - 1, 0, from[0], used[0]);
	dijkstra(N - 1, 0, 0, from[1], used[1]);
	dijkstra(0, N - 1, 1, to[0], tmp);
	dijkstra(N - 1, 0, 1, to[1], tmp);

	int64_t ans = from[0][N - 1] + from[1][0];

	for(int i = 0; i < M; i++){
		int64_t temp = rev[i];

		if(used[0][i]) 
			temp += dijkstra(0, N - 1, i);
		else temp += min(from[0][N - 1], from[0][V[i]] + to[1][U[i]] + w[i]);

		if(used[1][i])
			temp += dijkstra(N - 1, 0, i);
		else temp += min(from[1][0], from[1][V[i]] + to[0][U[i]] + w[i]);

		ans = min(ans, temp);
	}

	cout << (ans >= INF ? -1 : ans) << '\n';
}

//***************** *****************

int32_t main(){
	ios_base::sync_with_stdio(NULL);
	cin.tie(NULL);

	#ifdef LOCAL
		auto begin = high_resolution_clock::now();
	#endif

	int tc = 1;
	// cin >> tc; 
	for (int t = 0; t < tc; t++)
		solve();

	#ifdef LOCAL 
		auto end = high_resolution_clock::now();
		cout << fixed << setprecision(4);
		cout << "Execution Time: " << duration_cast<duration<double>>(end - begin).count() << "seconds" << endl;
	#endif

	return 0;
}

/*
If code gives a WA, check for the following : 
1. I/O format

2. Are you clearing all global variables in between tests if multitests are a thing

3. Can you definitively prove the logic
*/

Subtask #1
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	332 KB	Output is correct
2	Correct	1 ms	332 KB	Output is correct
3	Correct	3 ms	332 KB	Output is correct
4	Correct	3 ms	332 KB	Output is correct
5	Correct	1 ms	332 KB	Output is correct
6	Correct	1 ms	332 KB	Output is correct
7	Correct	0 ms	332 KB	Output is correct
8	Correct	0 ms	332 KB	Output is correct
9	Correct	1 ms	332 KB	Output is correct
10	Correct	46 ms	372 KB	Output is correct
11	Correct	45 ms	372 KB	Output is correct
12	Correct	46 ms	332 KB	Output is correct
13	Correct	1 ms	332 KB	Output is correct
14	Correct	3 ms	332 KB	Output is correct
15	Correct	2 ms	332 KB	Output is correct
16	Correct	3 ms	392 KB	Output is correct

Subtask #2
11.0 / 11.0

#	결과	실행 시간	메모리	Grader output
1	Correct	26 ms	2380 KB	Output is correct
2	Correct	27 ms	3396 KB	Output is correct
3	Correct	28 ms	3500 KB	Output is correct
4	Correct	3 ms	468 KB	Output is correct
5	Correct	3 ms	344 KB	Output is correct
6	Correct	1 ms	332 KB	Output is correct
7	Correct	1 ms	340 KB	Output is correct
8	Correct	1 ms	332 KB	Output is correct
9	Correct	26 ms	3468 KB	Output is correct
10	Correct	25 ms	3524 KB	Output is correct
11	Correct	29 ms	3620 KB	Output is correct
12	Correct	28 ms	3524 KB	Output is correct
13	Correct	28 ms	3532 KB	Output is correct
14	Correct	28 ms	3688 KB	Output is correct

Subtask #3
21.0 / 21.0

#	결과	실행 시간	메모리	Grader output
1	Correct	3 ms	332 KB	Output is correct
2	Correct	1 ms	332 KB	Output is correct
3	Correct	20 ms	1868 KB	Output is correct
4	Correct	1 ms	332 KB	Output is correct
5	Correct	25 ms	3324 KB	Output is correct
6	Correct	1 ms	332 KB	Output is correct
7	Correct	1 ms	332 KB	Output is correct
8	Correct	26 ms	3316 KB	Output is correct
9	Correct	23 ms	3228 KB	Output is correct
10	Correct	29 ms	3304 KB	Output is correct
11	Correct	25 ms	3276 KB	Output is correct
12	Correct	28 ms	3376 KB	Output is correct
13	Correct	1 ms	332 KB	Output is correct
14	Correct	1 ms	332 KB	Output is correct
15	Correct	1 ms	332 KB	Output is correct
16	Correct	1 ms	332 KB	Output is correct
17	Correct	1 ms	332 KB	Output is correct
18	Correct	1 ms	332 KB	Output is correct
19	Correct	25 ms	3372 KB	Output is correct
20	Correct	25 ms	3276 KB	Output is correct
21	Correct	27 ms	3280 KB	Output is correct
22	Correct	25 ms	3320 KB	Output is correct

Subtask #4
63.0 / 63.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	332 KB	Output is correct
2	Correct	1 ms	332 KB	Output is correct
3	Correct	3 ms	332 KB	Output is correct
4	Correct	3 ms	332 KB	Output is correct
5	Correct	1 ms	332 KB	Output is correct
6	Correct	1 ms	332 KB	Output is correct
7	Correct	0 ms	332 KB	Output is correct
8	Correct	0 ms	332 KB	Output is correct
9	Correct	1 ms	332 KB	Output is correct
10	Correct	46 ms	372 KB	Output is correct
11	Correct	45 ms	372 KB	Output is correct
12	Correct	46 ms	332 KB	Output is correct
13	Correct	1 ms	332 KB	Output is correct
14	Correct	3 ms	332 KB	Output is correct
15	Correct	2 ms	332 KB	Output is correct
16	Correct	3 ms	392 KB	Output is correct
17	Correct	26 ms	2380 KB	Output is correct
18	Correct	27 ms	3396 KB	Output is correct
19	Correct	28 ms	3500 KB	Output is correct
20	Correct	3 ms	468 KB	Output is correct
21	Correct	3 ms	344 KB	Output is correct
22	Correct	1 ms	332 KB	Output is correct
23	Correct	1 ms	340 KB	Output is correct
24	Correct	1 ms	332 KB	Output is correct
25	Correct	26 ms	3468 KB	Output is correct
26	Correct	25 ms	3524 KB	Output is correct
27	Correct	29 ms	3620 KB	Output is correct
28	Correct	28 ms	3524 KB	Output is correct
29	Correct	28 ms	3532 KB	Output is correct
30	Correct	28 ms	3688 KB	Output is correct
31	Correct	3 ms	332 KB	Output is correct
32	Correct	1 ms	332 KB	Output is correct
33	Correct	20 ms	1868 KB	Output is correct
34	Correct	1 ms	332 KB	Output is correct
35	Correct	25 ms	3324 KB	Output is correct
36	Correct	1 ms	332 KB	Output is correct
37	Correct	1 ms	332 KB	Output is correct
38	Correct	26 ms	3316 KB	Output is correct
39	Correct	23 ms	3228 KB	Output is correct
40	Correct	29 ms	3304 KB	Output is correct
41	Correct	25 ms	3276 KB	Output is correct
42	Correct	28 ms	3376 KB	Output is correct
43	Correct	1 ms	332 KB	Output is correct
44	Correct	1 ms	332 KB	Output is correct
45	Correct	1 ms	332 KB	Output is correct
46	Correct	1 ms	332 KB	Output is correct
47	Correct	1 ms	332 KB	Output is correct
48	Correct	1 ms	332 KB	Output is correct
49	Correct	25 ms	3372 KB	Output is correct
50	Correct	25 ms	3276 KB	Output is correct
51	Correct	27 ms	3280 KB	Output is correct
52	Correct	25 ms	3320 KB	Output is correct
53	Correct	27 ms	3368 KB	Output is correct
54	Correct	30 ms	3348 KB	Output is correct
55	Correct	29 ms	3280 KB	Output is correct
56	Correct	3 ms	332 KB	Output is correct
57	Correct	2 ms	332 KB	Output is correct
58	Correct	124 ms	2720 KB	Output is correct
59	Correct	123 ms	2696 KB	Output is correct
60	Correct	127 ms	2624 KB	Output is correct
61	Correct	107 ms	2708 KB	Output is correct
62	Correct	124 ms	2636 KB	Output is correct
63	Correct	124 ms	2712 KB	Output is correct
64	Correct	125 ms	2848 KB	Output is correct
65	Correct	115 ms	3000 KB	Output is correct
66	Correct	103 ms	2892 KB	Output is correct
67	Correct	18 ms	2624 KB	Output is correct
68	Correct	25 ms	3532 KB	Output is correct
69	Correct	25 ms	3492 KB	Output is correct
70	Correct	29 ms	3524 KB	Output is correct
71	Correct	33 ms	3640 KB	Output is correct
72	Correct	27 ms	3492 KB	Output is correct
73	Correct	28 ms	3556 KB	Output is correct
74	Correct	28 ms	3540 KB	Output is correct

답안 #442785

Compilation message

Subtask #1 5.0 / 5.0

Subtask #2 11.0 / 11.0

Subtask #3 21.0 / 21.0

Subtask #4 63.0 / 63.0

Subtask #1
5.0 / 5.0

Subtask #2
11.0 / 11.0

Subtask #3
21.0 / 21.0

Subtask #4
63.0 / 63.0