#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define ll long long
#define all(x) (x).begin(), (x).end()
const int mxn = 30010;
int n, m;
map<int, ll> best[mxn];
vector<int> val[mxn];
int spot[mxn], jump[mxn];
int dx[] = {-1, 1};
void solve() {
priority_queue<pair<ll, pair<int, int>>> pq;
pq.push({0, {spot[0], jump[0]}});
best[spot[0]][jump[0]] = 0;
while (pq.size()) {
ll dist = -pq.top().first, pos = pq.top().second.first, pwr = pq.top().second.second;
pq.pop();
for (auto x : val[pos]) {
if (!best[pos].count(jump[x])) best[pos][jump[x]] = 1e18;
if (dist < best[pos][jump[x]]) {
best[pos][jump[x]] = dist;
pq.push({-dist, {pos, jump[x]}});
}
}
for (int d = 0; d < 2; d++) {
int newPos = pos + pwr * dx[d];
if (0 <= newPos && newPos < n) {
if (!best[newPos].count(pwr)) best[newPos][pwr] = 1e18;
if (dist + 1 < best[newPos][pwr]) {
best[newPos][pwr] = dist + 1;
pq.push({-best[newPos][pwr], {newPos, pwr}});
}
}
}
}
ll ans = 1e18;
for (auto x : best[spot[1]]) ans = min(ans, x.second);
cout << (ans != 1e18 ? ans : -1);
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n >> m;
for (int i = 0; i < m; i++) {
cin >> spot[i] >> jump[i];
val[spot[i]].push_back(i);
}
solve();
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
2392 KB |
Output is correct |
2 |
Correct |
1 ms |
2396 KB |
Output is correct |
3 |
Correct |
1 ms |
2396 KB |
Output is correct |
4 |
Correct |
2 ms |
2396 KB |
Output is correct |
5 |
Correct |
1 ms |
2396 KB |
Output is correct |
6 |
Correct |
1 ms |
2396 KB |
Output is correct |
7 |
Correct |
1 ms |
2396 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
2396 KB |
Output is correct |
2 |
Correct |
1 ms |
2396 KB |
Output is correct |
3 |
Correct |
1 ms |
2392 KB |
Output is correct |
4 |
Correct |
1 ms |
2396 KB |
Output is correct |
5 |
Correct |
1 ms |
2392 KB |
Output is correct |
6 |
Correct |
1 ms |
2396 KB |
Output is correct |
7 |
Correct |
1 ms |
2396 KB |
Output is correct |
8 |
Correct |
1 ms |
2396 KB |
Output is correct |
9 |
Correct |
1 ms |
2888 KB |
Output is correct |
10 |
Correct |
1 ms |
2648 KB |
Output is correct |
11 |
Correct |
4 ms |
2908 KB |
Output is correct |
12 |
Correct |
1 ms |
2652 KB |
Output is correct |
13 |
Correct |
1 ms |
2652 KB |
Output is correct |
14 |
Correct |
5 ms |
2908 KB |
Output is correct |
15 |
Correct |
8 ms |
2908 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
2396 KB |
Output is correct |
2 |
Correct |
1 ms |
2392 KB |
Output is correct |
3 |
Correct |
1 ms |
2396 KB |
Output is correct |
4 |
Correct |
2 ms |
2396 KB |
Output is correct |
5 |
Correct |
1 ms |
2392 KB |
Output is correct |
6 |
Correct |
2 ms |
2396 KB |
Output is correct |
7 |
Correct |
1 ms |
2396 KB |
Output is correct |
8 |
Correct |
1 ms |
2396 KB |
Output is correct |
9 |
Correct |
1 ms |
2652 KB |
Output is correct |
10 |
Correct |
1 ms |
2652 KB |
Output is correct |
11 |
Correct |
6 ms |
2784 KB |
Output is correct |
12 |
Correct |
2 ms |
2644 KB |
Output is correct |
13 |
Correct |
2 ms |
2652 KB |
Output is correct |
14 |
Correct |
5 ms |
2908 KB |
Output is correct |
15 |
Correct |
5 ms |
2908 KB |
Output is correct |
16 |
Correct |
1 ms |
2648 KB |
Output is correct |
17 |
Correct |
11 ms |
3420 KB |
Output is correct |
18 |
Correct |
1 ms |
2652 KB |
Output is correct |
19 |
Correct |
1 ms |
2648 KB |
Output is correct |
20 |
Correct |
2 ms |
2648 KB |
Output is correct |
21 |
Correct |
1 ms |
2652 KB |
Output is correct |
22 |
Correct |
1 ms |
2652 KB |
Output is correct |
23 |
Correct |
2 ms |
3188 KB |
Output is correct |
24 |
Correct |
5 ms |
3420 KB |
Output is correct |
25 |
Correct |
3 ms |
2972 KB |
Output is correct |
26 |
Correct |
2 ms |
3164 KB |
Output is correct |
27 |
Correct |
6 ms |
2900 KB |
Output is correct |
28 |
Correct |
8 ms |
4144 KB |
Output is correct |
29 |
Correct |
19 ms |
6492 KB |
Output is correct |
30 |
Correct |
4 ms |
3676 KB |
Output is correct |
31 |
Correct |
10 ms |
4696 KB |
Output is correct |
32 |
Correct |
7 ms |
4080 KB |
Output is correct |
33 |
Correct |
36 ms |
10192 KB |
Output is correct |
34 |
Correct |
39 ms |
10024 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
2396 KB |
Output is correct |
2 |
Correct |
1 ms |
2396 KB |
Output is correct |
3 |
Correct |
1 ms |
2396 KB |
Output is correct |
4 |
Correct |
1 ms |
2636 KB |
Output is correct |
5 |
Correct |
1 ms |
2396 KB |
Output is correct |
6 |
Correct |
1 ms |
2396 KB |
Output is correct |
7 |
Correct |
1 ms |
2648 KB |
Output is correct |
8 |
Correct |
1 ms |
2396 KB |
Output is correct |
9 |
Correct |
1 ms |
2652 KB |
Output is correct |
10 |
Correct |
2 ms |
2792 KB |
Output is correct |
11 |
Correct |
6 ms |
2908 KB |
Output is correct |
12 |
Correct |
1 ms |
2652 KB |
Output is correct |
13 |
Correct |
2 ms |
2640 KB |
Output is correct |
14 |
Correct |
6 ms |
2908 KB |
Output is correct |
15 |
Correct |
5 ms |
2908 KB |
Output is correct |
16 |
Correct |
1 ms |
2652 KB |
Output is correct |
17 |
Correct |
7 ms |
3420 KB |
Output is correct |
18 |
Correct |
1 ms |
2652 KB |
Output is correct |
19 |
Correct |
1 ms |
2652 KB |
Output is correct |
20 |
Correct |
1 ms |
2696 KB |
Output is correct |
21 |
Correct |
1 ms |
2652 KB |
Output is correct |
22 |
Correct |
1 ms |
2652 KB |
Output is correct |
23 |
Correct |
3 ms |
2904 KB |
Output is correct |
24 |
Correct |
6 ms |
3420 KB |
Output is correct |
25 |
Correct |
3 ms |
3164 KB |
Output is correct |
26 |
Correct |
2 ms |
3164 KB |
Output is correct |
27 |
Correct |
5 ms |
2968 KB |
Output is correct |
28 |
Correct |
6 ms |
3928 KB |
Output is correct |
29 |
Correct |
16 ms |
6300 KB |
Output is correct |
30 |
Correct |
5 ms |
3656 KB |
Output is correct |
31 |
Correct |
9 ms |
4696 KB |
Output is correct |
32 |
Correct |
6 ms |
3932 KB |
Output is correct |
33 |
Correct |
43 ms |
10376 KB |
Output is correct |
34 |
Correct |
38 ms |
10064 KB |
Output is correct |
35 |
Correct |
109 ms |
9772 KB |
Output is correct |
36 |
Correct |
9 ms |
3664 KB |
Output is correct |
37 |
Correct |
200 ms |
14032 KB |
Output is correct |
38 |
Correct |
161 ms |
13512 KB |
Output is correct |
39 |
Correct |
159 ms |
13512 KB |
Output is correct |
40 |
Correct |
186 ms |
13452 KB |
Output is correct |
41 |
Correct |
178 ms |
13484 KB |
Output is correct |
42 |
Correct |
7 ms |
3420 KB |
Output is correct |
43 |
Correct |
64 ms |
3420 KB |
Output is correct |
44 |
Correct |
4 ms |
3164 KB |
Output is correct |
45 |
Correct |
435 ms |
33636 KB |
Output is correct |
46 |
Correct |
437 ms |
33580 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
2396 KB |
Output is correct |
2 |
Correct |
1 ms |
2396 KB |
Output is correct |
3 |
Correct |
1 ms |
2396 KB |
Output is correct |
4 |
Correct |
1 ms |
2640 KB |
Output is correct |
5 |
Correct |
1 ms |
2396 KB |
Output is correct |
6 |
Correct |
1 ms |
2396 KB |
Output is correct |
7 |
Correct |
1 ms |
2396 KB |
Output is correct |
8 |
Correct |
1 ms |
2628 KB |
Output is correct |
9 |
Correct |
1 ms |
2652 KB |
Output is correct |
10 |
Correct |
2 ms |
2652 KB |
Output is correct |
11 |
Correct |
4 ms |
2908 KB |
Output is correct |
12 |
Correct |
2 ms |
2652 KB |
Output is correct |
13 |
Correct |
1 ms |
2660 KB |
Output is correct |
14 |
Correct |
5 ms |
2904 KB |
Output is correct |
15 |
Correct |
5 ms |
3028 KB |
Output is correct |
16 |
Correct |
1 ms |
2652 KB |
Output is correct |
17 |
Correct |
7 ms |
3420 KB |
Output is correct |
18 |
Correct |
1 ms |
2652 KB |
Output is correct |
19 |
Correct |
1 ms |
2636 KB |
Output is correct |
20 |
Correct |
2 ms |
2652 KB |
Output is correct |
21 |
Correct |
1 ms |
2648 KB |
Output is correct |
22 |
Correct |
1 ms |
2652 KB |
Output is correct |
23 |
Correct |
2 ms |
2908 KB |
Output is correct |
24 |
Correct |
5 ms |
3412 KB |
Output is correct |
25 |
Correct |
3 ms |
3164 KB |
Output is correct |
26 |
Correct |
3 ms |
3160 KB |
Output is correct |
27 |
Correct |
6 ms |
2908 KB |
Output is correct |
28 |
Correct |
6 ms |
3928 KB |
Output is correct |
29 |
Correct |
18 ms |
6276 KB |
Output is correct |
30 |
Correct |
4 ms |
3636 KB |
Output is correct |
31 |
Correct |
10 ms |
4652 KB |
Output is correct |
32 |
Correct |
7 ms |
3932 KB |
Output is correct |
33 |
Correct |
40 ms |
9988 KB |
Output is correct |
34 |
Correct |
40 ms |
10200 KB |
Output is correct |
35 |
Correct |
110 ms |
9752 KB |
Output is correct |
36 |
Correct |
9 ms |
3920 KB |
Output is correct |
37 |
Correct |
194 ms |
13976 KB |
Output is correct |
38 |
Correct |
190 ms |
13596 KB |
Output is correct |
39 |
Correct |
192 ms |
13592 KB |
Output is correct |
40 |
Correct |
187 ms |
13532 KB |
Output is correct |
41 |
Correct |
171 ms |
13536 KB |
Output is correct |
42 |
Correct |
8 ms |
3572 KB |
Output is correct |
43 |
Correct |
70 ms |
3412 KB |
Output is correct |
44 |
Correct |
4 ms |
3168 KB |
Output is correct |
45 |
Correct |
420 ms |
33628 KB |
Output is correct |
46 |
Correct |
429 ms |
33656 KB |
Output is correct |
47 |
Correct |
867 ms |
49980 KB |
Output is correct |
48 |
Correct |
6 ms |
3416 KB |
Output is correct |
49 |
Correct |
4 ms |
3420 KB |
Output is correct |
50 |
Correct |
3 ms |
3228 KB |
Output is correct |
51 |
Correct |
161 ms |
23444 KB |
Output is correct |
52 |
Correct |
202 ms |
25504 KB |
Output is correct |
53 |
Correct |
20 ms |
9308 KB |
Output is correct |
54 |
Correct |
2 ms |
3416 KB |
Output is correct |
55 |
Correct |
3 ms |
4188 KB |
Output is correct |
56 |
Correct |
8 ms |
5724 KB |
Output is correct |
57 |
Correct |
167 ms |
29780 KB |
Output is correct |
58 |
Correct |
12 ms |
7004 KB |
Output is correct |
59 |
Correct |
14 ms |
9052 KB |
Output is correct |
60 |
Correct |
23 ms |
10832 KB |
Output is correct |
61 |
Execution timed out |
1028 ms |
9760 KB |
Time limit exceeded |
62 |
Halted |
0 ms |
0 KB |
- |