oj.uz

Submission #224117

# Submission time Handle Problem Language Result Execution time Memory
224117 2020-04-17T08:13:49 Z shenxy Olympic Bus (JOI20_ho_t4) C++11
100 / 100
 790 ms 3576 KB 
#include <cstdio>
#include <algorithm>
#include <vector>
#include <queue>
#include <functional>
#define F first
#define S second
using namespace std;
typedef pair<int, int> ii;
typedef pair<long long, long long> ll;
typedef pair<long long, ii> yay;
typedef pair<ii, ll> edge;
const long long INF = 1000000000000000000;
int main() {
	int N, M;
	scanf("%d %d", &N, &M);
	edge edges[M];
	bool inr[M], inb[M], inrr[M], inrb[M];
	fill_n(inr, M, 0);
	fill_n(inb, M, 0);
	fill_n(inrr, M, 0);
	fill_n(inrb, M, 0);
	vector<int> adjlist[N], revlist[N];
	for (int i = 0; i < M; ++i) {
		scanf("%d %d %lld %lld", &edges[i].F.F, &edges[i].F.S, &edges[i].S.F, &edges[i].S.S);
		--edges[i].F.F, --edges[i].F.S;
		adjlist[edges[i].F.F].push_back(i);
		revlist[edges[i].F.S].push_back(i);
	}
	long long rsp[N], bsp[N], rrsp[N], rbsp[N];
	fill_n(rsp, N, INF);
	priority_queue< yay, vector<yay>, greater<yay> > dijkstra;
	dijkstra.push(yay(0, ii(0, -1)));
	rsp[0] = 0;
	while (!dijkstra.empty()) {
		yay a = dijkstra.top();
		dijkstra.pop();
		if (a.F > rsp[a.S.F]) continue;
		if (a.S.S != -1) inr[a.S.S] = true;
		for (int j: adjlist[a.S.F]) {
			if (edges[j].S.F + a.F < rsp[edges[j].F.S]) {
				rsp[edges[j].F.S] = edges[j].S.F + a.first;
				dijkstra.push(yay(rsp[edges[j].F.S], ii(edges[j].F.S, j)));
			}
		}
	}
	fill_n(bsp, N, INF);
	dijkstra.push(yay(0, ii(N - 1, -1)));
	bsp[N - 1] = 0;
	while (!dijkstra.empty()) {
		yay a = dijkstra.top();
		dijkstra.pop();
		if (a.F > bsp[a.S.F]) continue;
		if (a.S.S != -1) inb[a.S.S] = true;
		for (int j: adjlist[a.S.F]) {
			if (edges[j].S.F + a.F < bsp[edges[j].F.S]) {
				bsp[edges[j].F.S] = edges[j].S.F + a.first;
				dijkstra.push(yay(bsp[edges[j].F.S], ii(edges[j].F.S, j)));
			}
		}
	}
	fill_n(rrsp, N, INF);
	dijkstra.push(yay(0, ii(0, -1)));
	rrsp[0] = 0;
	while (!dijkstra.empty()) {
		yay a = dijkstra.top();
		dijkstra.pop();
		if (a.F > rrsp[a.S.F]) continue;
		if (a.S.S != -1) inrr[a.S.S] = true;
		for (int j: revlist[a.S.F]) {
			if (edges[j].S.F + a.F < rrsp[edges[j].F.F]) {
				rrsp[edges[j].F.F] = edges[j].S.F + a.first;
				dijkstra.push(yay(rrsp[edges[j].F.F], ii(edges[j].F.F, j)));
			}
		}
	}
	fill_n(rbsp, N, INF);
	dijkstra.push(yay(0, ii(N - 1, -1)));
	rbsp[N - 1] = 0;
	while (!dijkstra.empty()) {
		yay a = dijkstra.top();
		dijkstra.pop();
		if (a.F > rbsp[a.S.F]) continue;
		if (a.S.S != -1) inrb[a.S.S] = true;
		for (int j: revlist[a.S.F]) {
			if (edges[j].S.F + a.F < rbsp[edges[j].F.F]) {
				rbsp[edges[j].F.F] = edges[j].S.F + a.first;
				dijkstra.push(yay(rbsp[edges[j].F.F], ii(edges[j].F.F, j)));
			}
		}
	}
	long long ans = rsp[N - 1] + bsp[0];
	for (int i = 0; i < M; ++i) {
		long long a, b, c = edges[i].S.F, d = edges[i].S.F;
		if (inr[i]) {
			long long rsp[N];
			fill_n(rsp, N, INF);
			dijkstra.push(yay(0, ii(0, -1)));
			rsp[0] = 0;
			while (!dijkstra.empty()) {
				yay a = dijkstra.top();
				dijkstra.pop();
				if (a.F > rsp[a.S.F]) continue;
				for (int j: adjlist[a.S.F]) {
					if (j == i) continue;
					if (edges[j].S.F + a.F < rsp[edges[j].F.S]) {
						rsp[edges[j].F.S] = edges[j].S.F + a.first;
						dijkstra.push(yay(rsp[edges[j].F.S], ii(edges[j].F.S, j)));
					}
				}
				if (a.S.F == edges[i].F.S) {
					if (edges[i].S.F + a.F < rsp[edges[i].F.F]) {
						rsp[edges[i].F.F] = edges[i].S.F + a.first;
						dijkstra.push(yay(rsp[edges[i].F.F], ii(edges[i].F.F, i)));
					}
				}
			}
			a = rsp[N - 1], c += rsp[edges[i].F.S];
		} else a = rsp[N - 1], c += rsp[edges[i].F.S];
		if (inb[i]) {
			long long bsp[N];
			fill_n(bsp, N, INF);
			dijkstra.push(yay(0, ii(N - 1, -1)));
			bsp[N - 1] = 0;
			while (!dijkstra.empty()) {
				yay a = dijkstra.top();
				dijkstra.pop();
				if (a.F > bsp[a.S.F]) continue;
				for (int j: adjlist[a.S.F]) {
					if (j == i) continue;
					if (edges[j].S.F + a.F < bsp[edges[j].F.S]) {
						bsp[edges[j].F.S] = edges[j].S.F + a.first;
						dijkstra.push(yay(bsp[edges[j].F.S], ii(edges[j].F.S, j)));
					}
				}
				if (a.S.F == edges[i].F.S) {
					if (edges[i].S.F + a.F < bsp[edges[i].F.F]) {
						bsp[edges[i].F.F] = edges[i].S.F + a.first;
						dijkstra.push(yay(bsp[edges[i].F.F], ii(edges[i].F.F, i)));
					}
				}
			}
			b = bsp[0], d += bsp[edges[i].F.S];
		} else b = bsp[0], d += bsp[edges[i].F.S];
		d += rrsp[edges[i].F.F];
		c += rbsp[edges[i].F.F];
		ans = min(ans, min(a, c) + min(b, d) + edges[i].S.S);
	}
	printf("%lld", ans < INF ? ans : -1);
	return 0;
}

Compilation message

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &N, &M);
  ~~~~~^~~~~~~~~~~~~~~~~
ho_t4.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %lld %lld", &edges[i].F.F, &edges[i].F.S, &edges[i].S.F, &edges[i].S.S);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 17 ms 384 KB Output is correct
4 Correct 18 ms 384 KB Output is correct
5 Correct 6 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 4 ms 256 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 23 ms 384 KB Output is correct
11 Correct 23 ms 384 KB Output is correct
12 Correct 22 ms 384 KB Output is correct
13 Correct 7 ms 384 KB Output is correct
14 Correct 12 ms 384 KB Output is correct
15 Correct 12 ms 384 KB Output is correct
16 Correct 12 ms 384 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 134 ms 2424 KB Output is correct
2 Correct 125 ms 2424 KB Output is correct
3 Correct 133 ms 2432 KB Output is correct
4 Correct 16 ms 384 KB Output is correct
5 Correct 10 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 256 KB Output is correct
9 Correct 51 ms 2296 KB Output is correct
10 Correct 48 ms 2304 KB Output is correct
11 Correct 99 ms 2304 KB Output is correct
12 Correct 90 ms 2432 KB Output is correct
13 Correct 89 ms 2296 KB Output is correct
14 Correct 86 ms 2432 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 78 ms 1912 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 96 ms 2424 KB Output is correct
6 Correct 4 ms 256 KB Output is correct
7 Correct 5 ms 256 KB Output is correct
8 Correct 40 ms 2304 KB Output is correct
9 Correct 44 ms 2296 KB Output is correct
10 Correct 70 ms 2304 KB Output is correct
11 Correct 69 ms 2304 KB Output is correct
12 Correct 72 ms 2304 KB Output is correct
13 Correct 4 ms 256 KB Output is correct
14 Correct 4 ms 256 KB Output is correct
15 Correct 4 ms 256 KB Output is correct
16 Correct 4 ms 256 KB Output is correct
17 Correct 4 ms 256 KB Output is correct
18 Correct 4 ms 256 KB Output is correct
19 Correct 74 ms 2432 KB Output is correct
20 Correct 72 ms 2304 KB Output is correct
21 Correct 71 ms 2304 KB Output is correct
22 Correct 76 ms 2296 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 17 ms 384 KB Output is correct
4 Correct 18 ms 384 KB Output is correct
5 Correct 6 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 4 ms 256 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 23 ms 384 KB Output is correct
11 Correct 23 ms 384 KB Output is correct
12 Correct 22 ms 384 KB Output is correct
13 Correct 7 ms 384 KB Output is correct
14 Correct 12 ms 384 KB Output is correct
15 Correct 12 ms 384 KB Output is correct
16 Correct 12 ms 384 KB Output is correct
17 Correct 134 ms 2424 KB Output is correct
18 Correct 125 ms 2424 KB Output is correct
19 Correct 133 ms 2432 KB Output is correct
20 Correct 16 ms 384 KB Output is correct
21 Correct 10 ms 384 KB Output is correct
22 Correct 5 ms 384 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 4 ms 256 KB Output is correct
25 Correct 51 ms 2296 KB Output is correct
26 Correct 48 ms 2304 KB Output is correct
27 Correct 99 ms 2304 KB Output is correct
28 Correct 90 ms 2432 KB Output is correct
29 Correct 89 ms 2296 KB Output is correct
30 Correct 86 ms 2432 KB Output is correct
31 Correct 13 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct
33 Correct 78 ms 1912 KB Output is correct
34 Correct 5 ms 384 KB Output is correct
35 Correct 96 ms 2424 KB Output is correct
36 Correct 4 ms 256 KB Output is correct
37 Correct 5 ms 256 KB Output is correct
38 Correct 40 ms 2304 KB Output is correct
39 Correct 44 ms 2296 KB Output is correct
40 Correct 70 ms 2304 KB Output is correct
41 Correct 69 ms 2304 KB Output is correct
42 Correct 72 ms 2304 KB Output is correct
43 Correct 4 ms 256 KB Output is correct
44 Correct 4 ms 256 KB Output is correct
45 Correct 4 ms 256 KB Output is correct
46 Correct 4 ms 256 KB Output is correct
47 Correct 4 ms 256 KB Output is correct
48 Correct 4 ms 256 KB Output is correct
49 Correct 74 ms 2432 KB Output is correct
50 Correct 72 ms 2304 KB Output is correct
51 Correct 71 ms 2304 KB Output is correct
52 Correct 76 ms 2296 KB Output is correct
53 Correct 141 ms 2296 KB Output is correct
54 Correct 140 ms 2296 KB Output is correct
55 Correct 139 ms 2424 KB Output is correct
56 Correct 18 ms 384 KB Output is correct
57 Correct 18 ms 384 KB Output is correct
58 Correct 121 ms 1912 KB Output is correct
59 Correct 125 ms 1920 KB Output is correct
60 Correct 130 ms 2040 KB Output is correct
61 Correct 120 ms 1912 KB Output is correct
62 Correct 119 ms 1920 KB Output is correct
63 Correct 127 ms 1920 KB Output is correct
64 Correct 790 ms 2304 KB Output is correct
65 Correct 715 ms 3192 KB Output is correct
66 Correct 694 ms 3068 KB Output is correct
67 Correct 25 ms 2688 KB Output is correct
68 Correct 55 ms 3456 KB Output is correct
69 Correct 54 ms 3456 KB Output is correct
70 Correct 98 ms 3448 KB Output is correct
71 Correct 97 ms 3448 KB Output is correct
72 Correct 102 ms 3448 KB Output is correct
73 Correct 108 ms 3576 KB Output is correct
74 Correct 95 ms 3448 KB Output is correct