oj.uz

Submission #332600

# Submission time Handle Problem Language Result Execution time Memory
332600 2020-12-02T22:57:05 Z ChrisT Olympic Bus (JOI20_ho_t4) C++17
100 / 100
 427 ms 7248 KB 
#include <bits/stdc++.h>
using namespace std;
const int MN = 203;
struct Edge {
	int u,v,c,d;
};
set<pair<int,int>> adj[MN][MN];
int dist1[MN][MN], distN[MN][MN], dist12[MN][MN], distN2[MN][MN], p[MN], n;
vector<int> e1 = {-1},eN = {-1}, e12={-1}, eN2={-1};
void dijkstra (int *dist, int src) {
	memset(dist,0x3f,sizeof(int) * MN); memset(p,-1,sizeof p);
	dist[src] = 0;
	p[src] = -1;
	vector<bool> vis(n+1);
	while (true) {
		int cur = -1;
		for (int i = 1; i <= n; i++) if (!vis[i] && dist[i] < 1e9 && (cur == -1 || dist[i] < dist[cur])) cur = i;
		if (!~cur) break;
		vis[cur] = 1;
		for (int i = 1; i <= n; i++) if (!adj[cur][i].empty()) {
			int att = dist[cur] + adj[cur][i].begin()->first;
			if (att < dist[i]) {
				dist[i] = att;
				p[i] = adj[cur][i].begin()->second;
			}
		}
	}
} 
int main () {
	int m;
	scanf ("%d %d",&n,&m);
	vector<Edge> edges(m);
	for (int i = 0; i < m; i++) {
		Edge &e = edges[i];
		scanf ("%d %d %d %d",&e.u,&e.v,&e.c,&e.d);
		adj[e.u][e.v].emplace(e.c,i);
	}
	dijkstra(dist1[0],1);
	for (int i = 1; i <= n; i++) if (~p[i]) e1.push_back(p[i]);
	for (int i = 1; i < (int)e1.size(); i++) {
		Edge &e = edges[e1[i]];
		adj[e.u][e.v].erase({e.c,e1[i]});
		dijkstra(dist1[i],1);
		adj[e.u][e.v].emplace(e.c,e1[i]);
	}
	dijkstra(distN2[0],n);
	for (int i = 1; i <= n; i++) if (~p[i]) eN2.push_back(p[i]);
	for (int i = 1; i < (int)eN2.size(); i++) {
		Edge &e = edges[eN2[i]];
		adj[e.u][e.v].erase({e.c,eN2[i]});
		dijkstra(distN2[i],n);
		adj[e.u][e.v].emplace(e.c,eN2[i]);
	}
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= n; j++)
			adj[i][j].clear();
	for (int i = 0; i < m; i++) {
		Edge &e = edges[i];
		adj[e.v][e.u].emplace(e.c,i);
	}
	dijkstra(distN[0],n);
	for (int i = 1; i <= n; i++) if (~p[i]) eN.push_back(p[i]);
	for (int i = 1; i < (int)eN.size(); i++) {
		Edge &e = edges[eN[i]];
		adj[e.v][e.u].erase({e.c,eN[i]});
		dijkstra(distN[i],n);
		adj[e.v][e.u].emplace(e.c,eN[i]);
	}
	dijkstra(dist12[0],1);
	for (int i = 1; i <= n; i++) if (~p[i]) e12.push_back(p[i]);
	for (int i = 1; i < (int)e12.size(); i++) {
		Edge &e = edges[e12[i]];
		adj[e.v][e.u].erase({e.c,e12[i]});
		dijkstra(dist12[i],1);
		adj[e.v][e.u].emplace(e.c,e12[i]);
	}
	int ret = dist1[0][n] + distN2[0][1];
	if (ret > 1e9) ret = 2e9;
	for (int i = 0; i < m; i++) {
		//want: dist(1,e.v) without edge i + dist(e.u,n) without edge i + e.d
		Edge &e = edges[i];
		int A = dist1[0][e.v], B = distN[0][e.u], C = distN2[0][e.v], D = dist12[0][e.u], E = dist1[0][n], F = distN2[0][1];
		for (int j = 1; j < (int)e1.size(); j++) if (e1[j] == i) {
			A = dist1[j][e.v];
			E = dist1[j][n];
		}
		for (int j = 1; j < (int)eN.size(); j++) if (eN[j] == i) {
			B = distN[j][e.u];
		}
		for (int j = 1; j < (int)eN2.size(); j++) if (eN2[j] == i) {
			C = distN2[j][e.v];
			F = distN2[j][1];
		}
		for (int j = 1; j < (int)e12.size(); j++) if (e12[j] == i) {
			D = dist12[j][e.u];
		}
		int G = min(A + B + e.c, E), H = min(C + D + e.c, F);
		if (G >= 1e9 || H >= 1e9) continue;
		ret = min(ret,G + H + e.d);
	}
	printf ("%d\n",ret > 15e8 ? -1 : ret);
    return 0;
}
//only O(N) "special" edges both ways, do dijkstra without each
//O(N^3) total

Compilation message

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:31:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   31 |  scanf ("%d %d",&n,&m);
      |  ~~~~~~^~~~~~~~~~~~~~~
ho_t4.cpp:35:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |   scanf ("%d %d %d %d",&e.u,&e.v,&e.c,&e.d);
      |   ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 149 ms 2924 KB Output is correct
2 Correct 7 ms 2412 KB Output is correct
3 Correct 168 ms 2924 KB Output is correct
4 Correct 160 ms 2924 KB Output is correct
5 Correct 4 ms 2412 KB Output is correct
6 Correct 13 ms 2412 KB Output is correct
7 Correct 2 ms 2284 KB Output is correct
8 Correct 2 ms 2304 KB Output is correct
9 Correct 3 ms 2412 KB Output is correct
10 Correct 164 ms 3180 KB Output is correct
11 Correct 161 ms 2944 KB Output is correct
12 Correct 159 ms 2924 KB Output is correct
13 Correct 36 ms 2668 KB Output is correct
14 Correct 102 ms 2796 KB Output is correct
15 Correct 100 ms 2796 KB Output is correct
16 Correct 103 ms 2796 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 418 ms 7020 KB Output is correct
2 Correct 427 ms 7040 KB Output is correct
3 Correct 420 ms 7248 KB Output is correct
4 Correct 159 ms 3084 KB Output is correct
5 Correct 127 ms 2924 KB Output is correct
6 Correct 32 ms 2540 KB Output is correct
7 Correct 3 ms 2284 KB Output is correct
8 Correct 2 ms 2284 KB Output is correct
9 Correct 124 ms 6892 KB Output is correct
10 Correct 144 ms 6892 KB Output is correct
11 Correct 248 ms 7020 KB Output is correct
12 Correct 264 ms 7020 KB Output is correct
13 Correct 241 ms 7020 KB Output is correct
14 Correct 243 ms 7020 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 142 ms 2924 KB Output is correct
2 Correct 34 ms 2540 KB Output is correct
3 Correct 345 ms 6116 KB Output is correct
4 Correct 14 ms 2412 KB Output is correct
5 Correct 348 ms 7020 KB Output is correct
6 Correct 2 ms 2284 KB Output is correct
7 Correct 2 ms 2284 KB Output is correct
8 Correct 116 ms 6764 KB Output is correct
9 Correct 119 ms 6636 KB Output is correct
10 Correct 201 ms 6764 KB Output is correct
11 Correct 207 ms 6764 KB Output is correct
12 Correct 201 ms 6764 KB Output is correct
13 Correct 2 ms 2284 KB Output is correct
14 Correct 2 ms 2284 KB Output is correct
15 Correct 2 ms 2284 KB Output is correct
16 Correct 2 ms 2284 KB Output is correct
17 Correct 2 ms 2284 KB Output is correct
18 Correct 2 ms 2284 KB Output is correct
19 Correct 204 ms 6764 KB Output is correct
20 Correct 204 ms 6892 KB Output is correct
21 Correct 209 ms 6892 KB Output is correct
22 Correct 204 ms 6892 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 149 ms 2924 KB Output is correct
2 Correct 7 ms 2412 KB Output is correct
3 Correct 168 ms 2924 KB Output is correct
4 Correct 160 ms 2924 KB Output is correct
5 Correct 4 ms 2412 KB Output is correct
6 Correct 13 ms 2412 KB Output is correct
7 Correct 2 ms 2284 KB Output is correct
8 Correct 2 ms 2304 KB Output is correct
9 Correct 3 ms 2412 KB Output is correct
10 Correct 164 ms 3180 KB Output is correct
11 Correct 161 ms 2944 KB Output is correct
12 Correct 159 ms 2924 KB Output is correct
13 Correct 36 ms 2668 KB Output is correct
14 Correct 102 ms 2796 KB Output is correct
15 Correct 100 ms 2796 KB Output is correct
16 Correct 103 ms 2796 KB Output is correct
17 Correct 418 ms 7020 KB Output is correct
18 Correct 427 ms 7040 KB Output is correct
19 Correct 420 ms 7248 KB Output is correct
20 Correct 159 ms 3084 KB Output is correct
21 Correct 127 ms 2924 KB Output is correct
22 Correct 32 ms 2540 KB Output is correct
23 Correct 3 ms 2284 KB Output is correct
24 Correct 2 ms 2284 KB Output is correct
25 Correct 124 ms 6892 KB Output is correct
26 Correct 144 ms 6892 KB Output is correct
27 Correct 248 ms 7020 KB Output is correct
28 Correct 264 ms 7020 KB Output is correct
29 Correct 241 ms 7020 KB Output is correct
30 Correct 243 ms 7020 KB Output is correct
31 Correct 142 ms 2924 KB Output is correct
32 Correct 34 ms 2540 KB Output is correct
33 Correct 345 ms 6116 KB Output is correct
34 Correct 14 ms 2412 KB Output is correct
35 Correct 348 ms 7020 KB Output is correct
36 Correct 2 ms 2284 KB Output is correct
37 Correct 2 ms 2284 KB Output is correct
38 Correct 116 ms 6764 KB Output is correct
39 Correct 119 ms 6636 KB Output is correct
40 Correct 201 ms 6764 KB Output is correct
41 Correct 207 ms 6764 KB Output is correct
42 Correct 201 ms 6764 KB Output is correct
43 Correct 2 ms 2284 KB Output is correct
44 Correct 2 ms 2284 KB Output is correct
45 Correct 2 ms 2284 KB Output is correct
46 Correct 2 ms 2284 KB Output is correct
47 Correct 2 ms 2284 KB Output is correct
48 Correct 2 ms 2284 KB Output is correct
49 Correct 204 ms 6764 KB Output is correct
50 Correct 204 ms 6892 KB Output is correct
51 Correct 209 ms 6892 KB Output is correct
52 Correct 204 ms 6892 KB Output is correct
53 Correct 367 ms 7148 KB Output is correct
54 Correct 388 ms 7020 KB Output is correct
55 Correct 402 ms 7148 KB Output is correct
56 Correct 164 ms 2924 KB Output is correct
57 Correct 164 ms 2924 KB Output is correct
58 Correct 369 ms 6252 KB Output is correct
59 Correct 366 ms 6252 KB Output is correct
60 Correct 357 ms 6252 KB Output is correct
61 Correct 365 ms 6252 KB Output is correct
62 Correct 356 ms 6252 KB Output is correct
63 Correct 365 ms 6252 KB Output is correct
64 Correct 287 ms 6252 KB Output is correct
65 Correct 280 ms 6252 KB Output is correct
66 Correct 249 ms 6252 KB Output is correct
67 Correct 54 ms 5612 KB Output is correct
68 Correct 130 ms 6892 KB Output is correct
69 Correct 125 ms 6892 KB Output is correct
70 Correct 228 ms 7020 KB Output is correct
71 Correct 229 ms 7020 KB Output is correct
72 Correct 227 ms 7020 KB Output is correct
73 Correct 230 ms 7020 KB Output is correct
74 Correct 233 ms 7020 KB Output is correct