#include <bits/stdc++.h>
using namespace std;
int main() {
int n, m;
cin >> n >> m;
vector<int> a(m), b(m);
for (int i = 0; i < m; i++) cin >> a[i] >> b[i];
int sn = sqrt(n / (__lg(n) + 1)) + 1;
vector<vector<int64_t>> d(n, vector<int64_t>(sn + 1, 9e18));
vector<vector<vector<tuple<int, int, int>>>> adj(n, vector<vector<tuple<int, int, int>>>(sn + 1));
for (int i = 0; i < m; i++) {
if (b[i] < sn) {
adj[a[i]][sn].emplace_back(a[i], b[i], 0);
} else {
for (int j = a[i] % b[i]; j < n; j += b[i]) {
adj[a[i]][sn].emplace_back(j, sn, abs(a[i] - j) / b[i]);
}
}
}
d[a[0]][sn] = 0;
priority_queue<tuple<int64_t, int, int>> pq;
pq.emplace(0, a[0], sn);
while (pq.size()) {
auto [du, u, s] = pq.top();
pq.pop();
if (d[u][s] != -du) continue;
du = -du;
if (u == a[1]) return cout << du, 0;
if (s != sn && u - s >= 0) {
int uu = u - s, ss = s, c = 1;
if (d[uu][ss] > du + c) {
d[uu][ss] = du + c;
pq.emplace(-d[uu][ss], uu, ss);
}
ss = sn;
if (d[uu][ss] > du + c) {
d[uu][ss] = du + c;
pq.emplace(-d[uu][ss], uu, ss);
}
}
if (s != sn && u + s < n) {
int uu = u + s, ss = s, c = 1;
if (d[uu][ss] > du + c) {
d[uu][ss] = du + c;
pq.emplace(-d[uu][ss], uu, ss);
}
ss = sn;
if (d[uu][ss] > du + c) {
d[uu][ss] = du + c;
pq.emplace(-d[uu][ss], uu, ss);
}
}
for (auto [uu, ss, c] : adj[u][s]) {
if (d[uu][ss] > du + c) {
d[uu][ss] = du + c;
pq.emplace(-d[uu][ss], uu, ss);
}
}
}
cout << -1;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Correct |
1 ms |
212 KB |
Output is correct |
3 |
Correct |
1 ms |
212 KB |
Output is correct |
4 |
Correct |
1 ms |
212 KB |
Output is correct |
5 |
Correct |
1 ms |
212 KB |
Output is correct |
6 |
Correct |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
1 ms |
212 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Correct |
1 ms |
212 KB |
Output is correct |
3 |
Correct |
1 ms |
212 KB |
Output is correct |
4 |
Correct |
1 ms |
212 KB |
Output is correct |
5 |
Correct |
1 ms |
212 KB |
Output is correct |
6 |
Correct |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
0 ms |
212 KB |
Output is correct |
8 |
Correct |
1 ms |
212 KB |
Output is correct |
9 |
Correct |
1 ms |
212 KB |
Output is correct |
10 |
Correct |
1 ms |
340 KB |
Output is correct |
11 |
Correct |
1 ms |
468 KB |
Output is correct |
12 |
Correct |
1 ms |
340 KB |
Output is correct |
13 |
Correct |
1 ms |
340 KB |
Output is correct |
14 |
Correct |
1 ms |
468 KB |
Output is correct |
15 |
Correct |
2 ms |
340 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
0 ms |
212 KB |
Output is correct |
6 |
Correct |
0 ms |
212 KB |
Output is correct |
7 |
Correct |
0 ms |
212 KB |
Output is correct |
8 |
Correct |
0 ms |
212 KB |
Output is correct |
9 |
Correct |
1 ms |
212 KB |
Output is correct |
10 |
Correct |
1 ms |
340 KB |
Output is correct |
11 |
Correct |
1 ms |
468 KB |
Output is correct |
12 |
Correct |
1 ms |
340 KB |
Output is correct |
13 |
Correct |
1 ms |
340 KB |
Output is correct |
14 |
Correct |
1 ms |
340 KB |
Output is correct |
15 |
Correct |
1 ms |
340 KB |
Output is correct |
16 |
Correct |
1 ms |
340 KB |
Output is correct |
17 |
Correct |
2 ms |
724 KB |
Output is correct |
18 |
Correct |
2 ms |
1236 KB |
Output is correct |
19 |
Correct |
2 ms |
1364 KB |
Output is correct |
20 |
Correct |
2 ms |
1364 KB |
Output is correct |
21 |
Correct |
1 ms |
468 KB |
Output is correct |
22 |
Correct |
2 ms |
1236 KB |
Output is correct |
23 |
Correct |
2 ms |
1236 KB |
Output is correct |
24 |
Correct |
3 ms |
1492 KB |
Output is correct |
25 |
Correct |
2 ms |
1364 KB |
Output is correct |
26 |
Correct |
2 ms |
1492 KB |
Output is correct |
27 |
Correct |
2 ms |
1364 KB |
Output is correct |
28 |
Correct |
3 ms |
1620 KB |
Output is correct |
29 |
Correct |
4 ms |
2388 KB |
Output is correct |
30 |
Correct |
2 ms |
1748 KB |
Output is correct |
31 |
Correct |
3 ms |
1876 KB |
Output is correct |
32 |
Correct |
3 ms |
1748 KB |
Output is correct |
33 |
Correct |
6 ms |
3028 KB |
Output is correct |
34 |
Correct |
5 ms |
3080 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Correct |
1 ms |
212 KB |
Output is correct |
3 |
Correct |
1 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
0 ms |
212 KB |
Output is correct |
6 |
Correct |
0 ms |
212 KB |
Output is correct |
7 |
Correct |
0 ms |
212 KB |
Output is correct |
8 |
Correct |
1 ms |
212 KB |
Output is correct |
9 |
Correct |
0 ms |
212 KB |
Output is correct |
10 |
Correct |
1 ms |
340 KB |
Output is correct |
11 |
Correct |
1 ms |
468 KB |
Output is correct |
12 |
Correct |
1 ms |
340 KB |
Output is correct |
13 |
Correct |
1 ms |
340 KB |
Output is correct |
14 |
Correct |
1 ms |
340 KB |
Output is correct |
15 |
Correct |
2 ms |
340 KB |
Output is correct |
16 |
Correct |
1 ms |
340 KB |
Output is correct |
17 |
Correct |
2 ms |
724 KB |
Output is correct |
18 |
Correct |
2 ms |
1236 KB |
Output is correct |
19 |
Correct |
2 ms |
1364 KB |
Output is correct |
20 |
Correct |
2 ms |
1364 KB |
Output is correct |
21 |
Correct |
1 ms |
468 KB |
Output is correct |
22 |
Correct |
2 ms |
1236 KB |
Output is correct |
23 |
Correct |
2 ms |
1236 KB |
Output is correct |
24 |
Correct |
3 ms |
1492 KB |
Output is correct |
25 |
Correct |
2 ms |
1364 KB |
Output is correct |
26 |
Correct |
2 ms |
1492 KB |
Output is correct |
27 |
Correct |
2 ms |
1364 KB |
Output is correct |
28 |
Correct |
3 ms |
1620 KB |
Output is correct |
29 |
Correct |
4 ms |
2388 KB |
Output is correct |
30 |
Correct |
2 ms |
1620 KB |
Output is correct |
31 |
Correct |
3 ms |
1876 KB |
Output is correct |
32 |
Correct |
2 ms |
1748 KB |
Output is correct |
33 |
Correct |
6 ms |
3028 KB |
Output is correct |
34 |
Correct |
4 ms |
3028 KB |
Output is correct |
35 |
Correct |
15 ms |
3084 KB |
Output is correct |
36 |
Correct |
3 ms |
980 KB |
Output is correct |
37 |
Correct |
19 ms |
4920 KB |
Output is correct |
38 |
Correct |
19 ms |
4628 KB |
Output is correct |
39 |
Correct |
17 ms |
4564 KB |
Output is correct |
40 |
Correct |
19 ms |
4500 KB |
Output is correct |
41 |
Correct |
18 ms |
4564 KB |
Output is correct |
42 |
Correct |
12 ms |
2196 KB |
Output is correct |
43 |
Correct |
12 ms |
2068 KB |
Output is correct |
44 |
Correct |
12 ms |
2088 KB |
Output is correct |
45 |
Correct |
24 ms |
9044 KB |
Output is correct |
46 |
Correct |
23 ms |
8720 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
1 ms |
212 KB |
Output is correct |
5 |
Correct |
0 ms |
212 KB |
Output is correct |
6 |
Correct |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
1 ms |
212 KB |
Output is correct |
8 |
Correct |
1 ms |
212 KB |
Output is correct |
9 |
Correct |
1 ms |
212 KB |
Output is correct |
10 |
Correct |
1 ms |
340 KB |
Output is correct |
11 |
Correct |
1 ms |
476 KB |
Output is correct |
12 |
Correct |
2 ms |
340 KB |
Output is correct |
13 |
Correct |
1 ms |
340 KB |
Output is correct |
14 |
Correct |
1 ms |
340 KB |
Output is correct |
15 |
Correct |
1 ms |
340 KB |
Output is correct |
16 |
Correct |
1 ms |
340 KB |
Output is correct |
17 |
Correct |
2 ms |
724 KB |
Output is correct |
18 |
Correct |
2 ms |
1236 KB |
Output is correct |
19 |
Correct |
1 ms |
1364 KB |
Output is correct |
20 |
Correct |
2 ms |
1364 KB |
Output is correct |
21 |
Correct |
1 ms |
476 KB |
Output is correct |
22 |
Correct |
1 ms |
1236 KB |
Output is correct |
23 |
Correct |
2 ms |
1236 KB |
Output is correct |
24 |
Correct |
3 ms |
1492 KB |
Output is correct |
25 |
Correct |
2 ms |
1364 KB |
Output is correct |
26 |
Correct |
2 ms |
1492 KB |
Output is correct |
27 |
Correct |
2 ms |
1364 KB |
Output is correct |
28 |
Correct |
3 ms |
1620 KB |
Output is correct |
29 |
Correct |
4 ms |
2388 KB |
Output is correct |
30 |
Correct |
2 ms |
1748 KB |
Output is correct |
31 |
Correct |
3 ms |
1876 KB |
Output is correct |
32 |
Correct |
2 ms |
1748 KB |
Output is correct |
33 |
Correct |
6 ms |
3028 KB |
Output is correct |
34 |
Correct |
4 ms |
3028 KB |
Output is correct |
35 |
Correct |
14 ms |
3056 KB |
Output is correct |
36 |
Correct |
3 ms |
980 KB |
Output is correct |
37 |
Correct |
14 ms |
4880 KB |
Output is correct |
38 |
Correct |
18 ms |
4632 KB |
Output is correct |
39 |
Correct |
18 ms |
4572 KB |
Output is correct |
40 |
Correct |
18 ms |
4508 KB |
Output is correct |
41 |
Correct |
18 ms |
4624 KB |
Output is correct |
42 |
Correct |
12 ms |
2196 KB |
Output is correct |
43 |
Correct |
16 ms |
2136 KB |
Output is correct |
44 |
Correct |
13 ms |
2092 KB |
Output is correct |
45 |
Correct |
23 ms |
9184 KB |
Output is correct |
46 |
Correct |
22 ms |
8724 KB |
Output is correct |
47 |
Correct |
40 ms |
23444 KB |
Output is correct |
48 |
Correct |
40 ms |
34088 KB |
Output is correct |
49 |
Correct |
40 ms |
38264 KB |
Output is correct |
50 |
Correct |
39 ms |
43092 KB |
Output is correct |
51 |
Correct |
66 ms |
50028 KB |
Output is correct |
52 |
Correct |
69 ms |
50340 KB |
Output is correct |
53 |
Correct |
56 ms |
46816 KB |
Output is correct |
54 |
Correct |
32 ms |
45828 KB |
Output is correct |
55 |
Correct |
33 ms |
45780 KB |
Output is correct |
56 |
Correct |
61 ms |
47028 KB |
Output is correct |
57 |
Correct |
36 ms |
49480 KB |
Output is correct |
58 |
Correct |
49 ms |
46936 KB |
Output is correct |
59 |
Correct |
48 ms |
46740 KB |
Output is correct |
60 |
Correct |
50 ms |
47680 KB |
Output is correct |
61 |
Correct |
49 ms |
47012 KB |
Output is correct |
62 |
Correct |
82 ms |
51384 KB |
Output is correct |
63 |
Correct |
117 ms |
82460 KB |
Output is correct |
64 |
Correct |
129 ms |
95108 KB |
Output is correct |
65 |
Correct |
160 ms |
104000 KB |
Output is correct |
66 |
Correct |
383 ms |
126408 KB |
Output is correct |
67 |
Correct |
222 ms |
126800 KB |
Output is correct |