#include <iostream>
#include <vector>
#include <queue>
#include <set>
#include <algorithm>
using namespace std;
#define MAXN 30005
#define INF 1000000009
#define pii pair<int, int>
#define mp make_pair
#define f first
#define s second
int n, m;
int b[MAXN];
int p[MAXN];
int dist[MAXN];
vector<int> jumps[MAXN];
void solve(int s) {
dist[b[0]] = 0;
priority_queue<pii, vector<pii>, greater<pii>> pq;
pq.push(mp(0,b[0])); // dist, pos
while (!pq.empty()) {
pii node = pq.top();
pq.pop();
if (node.f > dist[node.s]) {
continue;
}
for(auto jump : jumps[node.s]) {
for (int j = 1; node.s + jump * j < n; ++j) { // forward
if (dist[node.s + jump * j] > node.f + j) {
pq.push(mp(dist[node.s + jump * j] = node.f + j, node.s + jump * j));
if (binary_search(jumps[node.s + jump * j].begin(), jumps[node.s + jump * j].end(), jump)) { // no need to have multiple doges going same "route"
break;
}
}
}
for (int j = 1;node.s - jump * j >= 0;++j) { // backward
if (dist[node.s - jump * j] > node.f + j) {
pq.push(mp(dist[node.s - jump * j] = node.f + j, node.s - jump * j));
if (binary_search(jumps[node.s - jump * j].begin(), jumps[node.s - jump * j].end(), jump)) {
break;
}
}
}
}
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n >> m;
for(int i = 0; i < m; ++i) {
cin >> b[i] >> p[i];
jumps[b[i]].push_back(p[i]);
}
for(int i = 0; i < n; ++i) {
sort(jumps[i].begin(), jumps[i].end());
jumps[i].erase(unique(jumps[i].begin(), jumps[i].end()), jumps[i].end());
}
for(int i = 0; i < MAXN; ++i) {
dist[i] = INF;
}
solve(b[0]);
if (dist[b[1]] == INF) {
cout << "-1" << endl;
return 0;
}
cout << dist[b[1]] << endl;
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1108 KB |
Output is correct |
2 |
Correct |
1 ms |
1108 KB |
Output is correct |
3 |
Correct |
1 ms |
1108 KB |
Output is correct |
4 |
Correct |
1 ms |
1108 KB |
Output is correct |
5 |
Correct |
1 ms |
1108 KB |
Output is correct |
6 |
Correct |
1 ms |
1028 KB |
Output is correct |
7 |
Correct |
1 ms |
1108 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1108 KB |
Output is correct |
2 |
Correct |
1 ms |
1108 KB |
Output is correct |
3 |
Correct |
1 ms |
1108 KB |
Output is correct |
4 |
Correct |
1 ms |
1024 KB |
Output is correct |
5 |
Correct |
1 ms |
1032 KB |
Output is correct |
6 |
Correct |
1 ms |
1108 KB |
Output is correct |
7 |
Correct |
1 ms |
1108 KB |
Output is correct |
8 |
Correct |
1 ms |
1108 KB |
Output is correct |
9 |
Correct |
1 ms |
1108 KB |
Output is correct |
10 |
Correct |
1 ms |
1160 KB |
Output is correct |
11 |
Correct |
2 ms |
1172 KB |
Output is correct |
12 |
Correct |
1 ms |
1108 KB |
Output is correct |
13 |
Correct |
1 ms |
1108 KB |
Output is correct |
14 |
Correct |
1 ms |
1108 KB |
Output is correct |
15 |
Correct |
1 ms |
1108 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1108 KB |
Output is correct |
2 |
Correct |
1 ms |
1032 KB |
Output is correct |
3 |
Correct |
1 ms |
1108 KB |
Output is correct |
4 |
Correct |
1 ms |
1032 KB |
Output is correct |
5 |
Correct |
1 ms |
1108 KB |
Output is correct |
6 |
Correct |
1 ms |
1108 KB |
Output is correct |
7 |
Correct |
1 ms |
1036 KB |
Output is correct |
8 |
Correct |
1 ms |
1108 KB |
Output is correct |
9 |
Correct |
1 ms |
1108 KB |
Output is correct |
10 |
Correct |
1 ms |
1108 KB |
Output is correct |
11 |
Correct |
1 ms |
1108 KB |
Output is correct |
12 |
Correct |
1 ms |
1108 KB |
Output is correct |
13 |
Correct |
1 ms |
1108 KB |
Output is correct |
14 |
Correct |
1 ms |
1168 KB |
Output is correct |
15 |
Correct |
1 ms |
1172 KB |
Output is correct |
16 |
Correct |
1 ms |
1108 KB |
Output is correct |
17 |
Correct |
2 ms |
1108 KB |
Output is correct |
18 |
Correct |
1 ms |
1168 KB |
Output is correct |
19 |
Correct |
1 ms |
1108 KB |
Output is correct |
20 |
Correct |
2 ms |
1168 KB |
Output is correct |
21 |
Correct |
1 ms |
1164 KB |
Output is correct |
22 |
Correct |
1 ms |
1108 KB |
Output is correct |
23 |
Correct |
2 ms |
1168 KB |
Output is correct |
24 |
Correct |
2 ms |
1176 KB |
Output is correct |
25 |
Correct |
2 ms |
1236 KB |
Output is correct |
26 |
Correct |
1 ms |
1168 KB |
Output is correct |
27 |
Correct |
1 ms |
1108 KB |
Output is correct |
28 |
Correct |
2 ms |
1160 KB |
Output is correct |
29 |
Correct |
3 ms |
1364 KB |
Output is correct |
30 |
Correct |
1 ms |
1236 KB |
Output is correct |
31 |
Correct |
2 ms |
1236 KB |
Output is correct |
32 |
Correct |
2 ms |
1236 KB |
Output is correct |
33 |
Correct |
4 ms |
1552 KB |
Output is correct |
34 |
Correct |
4 ms |
1620 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1032 KB |
Output is correct |
2 |
Correct |
1 ms |
1036 KB |
Output is correct |
3 |
Correct |
1 ms |
1108 KB |
Output is correct |
4 |
Correct |
1 ms |
1108 KB |
Output is correct |
5 |
Correct |
1 ms |
1108 KB |
Output is correct |
6 |
Correct |
1 ms |
1108 KB |
Output is correct |
7 |
Correct |
1 ms |
1108 KB |
Output is correct |
8 |
Correct |
1 ms |
1108 KB |
Output is correct |
9 |
Correct |
1 ms |
1036 KB |
Output is correct |
10 |
Correct |
1 ms |
1108 KB |
Output is correct |
11 |
Correct |
1 ms |
1164 KB |
Output is correct |
12 |
Correct |
1 ms |
1108 KB |
Output is correct |
13 |
Correct |
1 ms |
1108 KB |
Output is correct |
14 |
Correct |
2 ms |
1108 KB |
Output is correct |
15 |
Correct |
1 ms |
1108 KB |
Output is correct |
16 |
Correct |
1 ms |
1108 KB |
Output is correct |
17 |
Correct |
1 ms |
1108 KB |
Output is correct |
18 |
Correct |
1 ms |
1108 KB |
Output is correct |
19 |
Correct |
1 ms |
1108 KB |
Output is correct |
20 |
Correct |
3 ms |
1236 KB |
Output is correct |
21 |
Correct |
1 ms |
1108 KB |
Output is correct |
22 |
Correct |
1 ms |
1108 KB |
Output is correct |
23 |
Correct |
1 ms |
1108 KB |
Output is correct |
24 |
Correct |
2 ms |
1236 KB |
Output is correct |
25 |
Correct |
2 ms |
1236 KB |
Output is correct |
26 |
Correct |
1 ms |
1172 KB |
Output is correct |
27 |
Correct |
1 ms |
1108 KB |
Output is correct |
28 |
Correct |
2 ms |
1236 KB |
Output is correct |
29 |
Correct |
3 ms |
1296 KB |
Output is correct |
30 |
Correct |
2 ms |
1236 KB |
Output is correct |
31 |
Correct |
2 ms |
1292 KB |
Output is correct |
32 |
Correct |
2 ms |
1156 KB |
Output is correct |
33 |
Correct |
4 ms |
1552 KB |
Output is correct |
34 |
Correct |
4 ms |
1620 KB |
Output is correct |
35 |
Correct |
6 ms |
1812 KB |
Output is correct |
36 |
Correct |
2 ms |
1236 KB |
Output is correct |
37 |
Correct |
7 ms |
1732 KB |
Output is correct |
38 |
Correct |
9 ms |
1896 KB |
Output is correct |
39 |
Correct |
8 ms |
1876 KB |
Output is correct |
40 |
Correct |
8 ms |
1876 KB |
Output is correct |
41 |
Correct |
9 ms |
1936 KB |
Output is correct |
42 |
Correct |
5 ms |
1748 KB |
Output is correct |
43 |
Correct |
5 ms |
1748 KB |
Output is correct |
44 |
Correct |
6 ms |
1748 KB |
Output is correct |
45 |
Correct |
11 ms |
2132 KB |
Output is correct |
46 |
Correct |
9 ms |
2112 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1108 KB |
Output is correct |
2 |
Correct |
1 ms |
1108 KB |
Output is correct |
3 |
Correct |
1 ms |
1108 KB |
Output is correct |
4 |
Correct |
1 ms |
1108 KB |
Output is correct |
5 |
Correct |
1 ms |
1168 KB |
Output is correct |
6 |
Correct |
1 ms |
1028 KB |
Output is correct |
7 |
Correct |
1 ms |
1108 KB |
Output is correct |
8 |
Correct |
1 ms |
1108 KB |
Output is correct |
9 |
Correct |
1 ms |
1108 KB |
Output is correct |
10 |
Correct |
1 ms |
1164 KB |
Output is correct |
11 |
Correct |
2 ms |
1108 KB |
Output is correct |
12 |
Correct |
1 ms |
1108 KB |
Output is correct |
13 |
Correct |
1 ms |
1108 KB |
Output is correct |
14 |
Correct |
1 ms |
1108 KB |
Output is correct |
15 |
Correct |
1 ms |
1164 KB |
Output is correct |
16 |
Correct |
1 ms |
1160 KB |
Output is correct |
17 |
Correct |
1 ms |
1236 KB |
Output is correct |
18 |
Correct |
1 ms |
1108 KB |
Output is correct |
19 |
Correct |
1 ms |
1108 KB |
Output is correct |
20 |
Correct |
3 ms |
1236 KB |
Output is correct |
21 |
Correct |
1 ms |
1168 KB |
Output is correct |
22 |
Correct |
1 ms |
1108 KB |
Output is correct |
23 |
Correct |
2 ms |
1176 KB |
Output is correct |
24 |
Correct |
2 ms |
1236 KB |
Output is correct |
25 |
Correct |
2 ms |
1236 KB |
Output is correct |
26 |
Correct |
2 ms |
1168 KB |
Output is correct |
27 |
Correct |
2 ms |
1108 KB |
Output is correct |
28 |
Correct |
1 ms |
1236 KB |
Output is correct |
29 |
Correct |
3 ms |
1284 KB |
Output is correct |
30 |
Correct |
1 ms |
1236 KB |
Output is correct |
31 |
Correct |
2 ms |
1236 KB |
Output is correct |
32 |
Correct |
1 ms |
1160 KB |
Output is correct |
33 |
Correct |
3 ms |
1552 KB |
Output is correct |
34 |
Correct |
4 ms |
1492 KB |
Output is correct |
35 |
Correct |
6 ms |
1748 KB |
Output is correct |
36 |
Correct |
3 ms |
1236 KB |
Output is correct |
37 |
Correct |
7 ms |
1664 KB |
Output is correct |
38 |
Correct |
9 ms |
1900 KB |
Output is correct |
39 |
Correct |
8 ms |
1876 KB |
Output is correct |
40 |
Correct |
8 ms |
1876 KB |
Output is correct |
41 |
Correct |
10 ms |
1876 KB |
Output is correct |
42 |
Correct |
5 ms |
1824 KB |
Output is correct |
43 |
Correct |
5 ms |
1748 KB |
Output is correct |
44 |
Correct |
7 ms |
1748 KB |
Output is correct |
45 |
Correct |
8 ms |
2132 KB |
Output is correct |
46 |
Correct |
9 ms |
2132 KB |
Output is correct |
47 |
Correct |
14 ms |
2512 KB |
Output is correct |
48 |
Correct |
7 ms |
2004 KB |
Output is correct |
49 |
Correct |
6 ms |
2004 KB |
Output is correct |
50 |
Correct |
4 ms |
1684 KB |
Output is correct |
51 |
Correct |
23 ms |
2896 KB |
Output is correct |
52 |
Correct |
23 ms |
2896 KB |
Output is correct |
53 |
Correct |
13 ms |
2956 KB |
Output is correct |
54 |
Correct |
2 ms |
1284 KB |
Output is correct |
55 |
Correct |
2 ms |
1288 KB |
Output is correct |
56 |
Correct |
229 ms |
2528 KB |
Output is correct |
57 |
Correct |
35 ms |
2380 KB |
Output is correct |
58 |
Correct |
7 ms |
1956 KB |
Output is correct |
59 |
Correct |
7 ms |
1900 KB |
Output is correct |
60 |
Correct |
8 ms |
1876 KB |
Output is correct |
61 |
Correct |
7 ms |
2004 KB |
Output is correct |
62 |
Correct |
9 ms |
2644 KB |
Output is correct |
63 |
Correct |
28 ms |
3984 KB |
Output is correct |
64 |
Correct |
27 ms |
3912 KB |
Output is correct |
65 |
Correct |
36 ms |
3924 KB |
Output is correct |
66 |
Correct |
78 ms |
6020 KB |
Output is correct |
67 |
Correct |
75 ms |
5940 KB |
Output is correct |