Submission #2860959
Source Code Expand
#include <bits/stdc++.h> using namespace std; struct State { int dist; int u; int c; }; const int N = 100005, M = 200005; int n, m; vector< pair<int,int> > G[N]; map <int,int> d[N]; void dijkstra() { deque<State> q; q.push_back({0, 1, 0}); d[1][0] = 0; while(!q.empty()) { State f = q.front(); q.pop_front(); int u = f.u, c = f.c; if (f.dist != d[u][c]) continue; if (!d[u].count(0) || (d[u].count(0) && d[u][0] > f.dist)) { d[u][0] = f.dist; //q.push_front({f.dist, u, 0}); } if (c) { int pos = lower_bound(G[u].begin(), G[u].end(), make_pair(c, 0)) - G[u].begin(); while(pos < G[u].size() && G[u][pos].first == c) { int v = G[u][pos].second; if (!d[v].count(c) || (d[v].count(c) && d[v][c] > f.dist)) { d[v][c] = f.dist; q.push_front({f.dist, v, c}); } ++pos; } } else { for (auto e : G[u]) { int v = e.second, cc = e.first; if (!d[v].count(cc) || (d[v].count(cc) && d[v][cc] > f.dist + 1)) { d[v][cc] = f.dist + 1; q.push_back({f.dist + 1, v, cc}); } } } } } int main() { ios_base::sync_with_stdio(false); cin.tie(0); cin >> n >> m; while(m--) { int u, v, c; cin >> u >> v >> c; G[u].push_back(make_pair(c, v)); G[v].push_back(make_pair(c, u)); } for (int i = 1; i <= n; ++i) { sort(G[i].begin(), G[i].end()); } dijkstra(); if (!d[n].count(0)) cout << -1 << endl; else cout << d[n][0] << endl; }
Submission Info
Submission Time | |
---|---|
Task | E - Snuke's Subway Trip |
User | vivukhue |
Language | C++14 (GCC 5.4.1) |
Score | 0 |
Code Size | 1467 Byte |
Status | WA |
Exec Time | 163 ms |
Memory | 25216 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 0 / 600 | ||||
Status | AC |
|
Set Name | Test Cases |
---|---|
Sample | |
All | 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt, 28.txt, 29.txt, 30.txt, 31.txt, 32.txt, 33.txt, 34.txt, 35.txt, 36.txt, 37.txt, 38.txt, sample_01.txt, sample_02.txt, sample_03.txt, w1.txt, w10.txt, w11.txt, w12.txt, w13.txt, w14.txt, w15.txt, w16.txt, w17.txt, w18.txt, w2.txt, w3.txt, w4.txt, w5.txt, w6.txt, w7.txt, w8.txt, w9.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
01.txt | AC | 4 ms | 7296 KB |
02.txt | AC | 163 ms | 16640 KB |
03.txt | WA | 94 ms | 13568 KB |
04.txt | AC | 84 ms | 13568 KB |
05.txt | WA | 95 ms | 13568 KB |
06.txt | WA | 38 ms | 10368 KB |
07.txt | WA | 44 ms | 11136 KB |
08.txt | WA | 86 ms | 13824 KB |
09.txt | WA | 47 ms | 11264 KB |
10.txt | WA | 48 ms | 11264 KB |
11.txt | AC | 147 ms | 23932 KB |
12.txt | AC | 67 ms | 11256 KB |
13.txt | AC | 100 ms | 15996 KB |
14.txt | AC | 129 ms | 23424 KB |
15.txt | AC | 98 ms | 20604 KB |
16.txt | AC | 118 ms | 22528 KB |
17.txt | AC | 132 ms | 24312 KB |
18.txt | AC | 80 ms | 12796 KB |
19.txt | AC | 109 ms | 22516 KB |
20.txt | AC | 150 ms | 25216 KB |
21.txt | AC | 88 ms | 15100 KB |
22.txt | AC | 126 ms | 21880 KB |
23.txt | WA | 76 ms | 12800 KB |
24.txt | AC | 90 ms | 18044 KB |
25.txt | AC | 64 ms | 11256 KB |
26.txt | AC | 91 ms | 16124 KB |
27.txt | AC | 74 ms | 12928 KB |
28.txt | WA | 78 ms | 14076 KB |
29.txt | WA | 79 ms | 14208 KB |
30.txt | AC | 99 ms | 20344 KB |
31.txt | AC | 91 ms | 15996 KB |
32.txt | WA | 92 ms | 18420 KB |
33.txt | WA | 81 ms | 13824 KB |
34.txt | AC | 110 ms | 20604 KB |
35.txt | AC | 62 ms | 11256 KB |
36.txt | AC | 84 ms | 13304 KB |
37.txt | AC | 114 ms | 20992 KB |
38.txt | AC | 105 ms | 20604 KB |
sample_01.txt | AC | 4 ms | 7296 KB |
sample_02.txt | WA | 4 ms | 7296 KB |
sample_03.txt | AC | 4 ms | 7296 KB |
w1.txt | WA | 82 ms | 12388 KB |
w10.txt | AC | 80 ms | 12672 KB |
w11.txt | AC | 79 ms | 11228 KB |
w12.txt | AC | 85 ms | 11648 KB |
w13.txt | WA | 71 ms | 11776 KB |
w14.txt | AC | 76 ms | 12672 KB |
w15.txt | AC | 64 ms | 11480 KB |
w16.txt | AC | 66 ms | 11392 KB |
w17.txt | AC | 72 ms | 11776 KB |
w18.txt | WA | 77 ms | 12672 KB |
w2.txt | WA | 82 ms | 12776 KB |
w3.txt | WA | 107 ms | 20212 KB |
w4.txt | AC | 112 ms | 22772 KB |
w5.txt | WA | 87 ms | 13428 KB |
w6.txt | WA | 89 ms | 13812 KB |
w7.txt | WA | 82 ms | 11700 KB |
w8.txt | WA | 73 ms | 11264 KB |
w9.txt | WA | 73 ms | 11648 KB |