#include <bits/stdc++.h>
#define ll long long
#define endl "\n"
using namespace std;
void solve()
{
ll n, m;
cin >> n >> m;
ll b[m], p[m];
vector<ll> eq[n];
for (ll i = 0; i < m; i++)
cin >> b[i] >> p[i], eq[b[i]].push_back(p[i]);
for (ll i = 0; i < n; i++)
sort(eq[i].begin(), eq[i].end());
map<ll, ll> dist[n];
dist[b[0]][p[0]] = 0;
queue<pair<ll, ll>> q;
q.push(make_pair(b[0], p[0]));
while (!q.empty())
{
auto [i, j] = q.front();
q.pop();
if (i == b[1])
{
cout << dist[i][j] << endl;
return;
}
if (i - j >= 0 and !dist[i - j].count(j) and dist[i - j].size() <= 5000)
dist[i - j][j] = dist[i][j] + 1, q.push(make_pair(i - j, j));
if (i + j < n and !dist[i + j].count(j) and dist[i + j].size() <= 5000)
dist[i + j][j] = dist[i][j] + 1, q.push(make_pair(i + j, j));
for (ll k : eq[i])
{
if (i - k >= 0 and !dist[i - k].count(k) and dist[i - k].size() <= 5000)
dist[i - k][k] = dist[i][j] + 1, q.push(make_pair(i - k, k));
if (i + k < n and !dist[i + k].count(k) and dist[i + k].size() <= 5000)
dist[i + k][k] = dist[i][j] + 1, q.push(make_pair(i + k, k));
}
eq[i].clear();
if (!dist[b[1]].empty())
{
ll ans = 1e18;
for (auto j : dist[b[1]])
ans = min(ans, j.second);
cout << ans << endl;
return;
}
}
cout << "-1\n";
}
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
ll t = 1;
// precomp();
// cin >> t;
for (ll i = 1; i <= t; i++)
solve();
cerr << "\nTime elapsed: " << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n";
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
1 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
344 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
1 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
1 ms |
348 KB |
Output is correct |
10 |
Correct |
1 ms |
348 KB |
Output is correct |
11 |
Correct |
1 ms |
348 KB |
Output is correct |
12 |
Correct |
1 ms |
348 KB |
Output is correct |
13 |
Correct |
1 ms |
348 KB |
Output is correct |
14 |
Correct |
1 ms |
860 KB |
Output is correct |
15 |
Correct |
1 ms |
600 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
1 ms |
344 KB |
Output is correct |
6 |
Correct |
1 ms |
344 KB |
Output is correct |
7 |
Correct |
1 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
1 ms |
348 KB |
Output is correct |
11 |
Correct |
1 ms |
348 KB |
Output is correct |
12 |
Correct |
1 ms |
348 KB |
Output is correct |
13 |
Correct |
1 ms |
348 KB |
Output is correct |
14 |
Correct |
1 ms |
756 KB |
Output is correct |
15 |
Correct |
1 ms |
604 KB |
Output is correct |
16 |
Correct |
1 ms |
348 KB |
Output is correct |
17 |
Correct |
1 ms |
604 KB |
Output is correct |
18 |
Correct |
1 ms |
600 KB |
Output is correct |
19 |
Correct |
1 ms |
756 KB |
Output is correct |
20 |
Correct |
1 ms |
604 KB |
Output is correct |
21 |
Correct |
1 ms |
532 KB |
Output is correct |
22 |
Correct |
1 ms |
604 KB |
Output is correct |
23 |
Correct |
1 ms |
860 KB |
Output is correct |
24 |
Correct |
2 ms |
860 KB |
Output is correct |
25 |
Correct |
1 ms |
604 KB |
Output is correct |
26 |
Correct |
2 ms |
604 KB |
Output is correct |
27 |
Correct |
1 ms |
860 KB |
Output is correct |
28 |
Correct |
4 ms |
1628 KB |
Output is correct |
29 |
Correct |
12 ms |
4292 KB |
Output is correct |
30 |
Correct |
3 ms |
1628 KB |
Output is correct |
31 |
Correct |
5 ms |
2668 KB |
Output is correct |
32 |
Correct |
5 ms |
1884 KB |
Output is correct |
33 |
Correct |
28 ms |
8020 KB |
Output is correct |
34 |
Correct |
12 ms |
4700 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
1 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
1 ms |
504 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
1 ms |
344 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
1 ms |
348 KB |
Output is correct |
12 |
Correct |
1 ms |
348 KB |
Output is correct |
13 |
Correct |
1 ms |
348 KB |
Output is correct |
14 |
Correct |
1 ms |
860 KB |
Output is correct |
15 |
Correct |
1 ms |
604 KB |
Output is correct |
16 |
Correct |
1 ms |
348 KB |
Output is correct |
17 |
Correct |
1 ms |
604 KB |
Output is correct |
18 |
Correct |
0 ms |
600 KB |
Output is correct |
19 |
Correct |
0 ms |
604 KB |
Output is correct |
20 |
Correct |
1 ms |
604 KB |
Output is correct |
21 |
Correct |
1 ms |
348 KB |
Output is correct |
22 |
Correct |
1 ms |
604 KB |
Output is correct |
23 |
Correct |
1 ms |
860 KB |
Output is correct |
24 |
Correct |
2 ms |
860 KB |
Output is correct |
25 |
Correct |
1 ms |
604 KB |
Output is correct |
26 |
Correct |
1 ms |
604 KB |
Output is correct |
27 |
Correct |
2 ms |
860 KB |
Output is correct |
28 |
Correct |
3 ms |
1628 KB |
Output is correct |
29 |
Correct |
11 ms |
4368 KB |
Output is correct |
30 |
Correct |
3 ms |
1628 KB |
Output is correct |
31 |
Correct |
5 ms |
2652 KB |
Output is correct |
32 |
Correct |
4 ms |
1880 KB |
Output is correct |
33 |
Correct |
27 ms |
8028 KB |
Output is correct |
34 |
Correct |
12 ms |
4444 KB |
Output is correct |
35 |
Correct |
5 ms |
1624 KB |
Output is correct |
36 |
Correct |
1 ms |
604 KB |
Output is correct |
37 |
Correct |
3 ms |
1256 KB |
Output is correct |
38 |
Correct |
5 ms |
1372 KB |
Output is correct |
39 |
Correct |
7 ms |
1372 KB |
Output is correct |
40 |
Correct |
7 ms |
1372 KB |
Output is correct |
41 |
Correct |
5 ms |
1368 KB |
Output is correct |
42 |
Correct |
4 ms |
1264 KB |
Output is correct |
43 |
Correct |
4 ms |
1500 KB |
Output is correct |
44 |
Correct |
4 ms |
1284 KB |
Output is correct |
45 |
Correct |
215 ms |
31428 KB |
Output is correct |
46 |
Correct |
84 ms |
17432 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
600 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
1 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
344 KB |
Output is correct |
14 |
Correct |
2 ms |
860 KB |
Output is correct |
15 |
Correct |
1 ms |
600 KB |
Output is correct |
16 |
Correct |
1 ms |
348 KB |
Output is correct |
17 |
Correct |
1 ms |
604 KB |
Output is correct |
18 |
Correct |
1 ms |
604 KB |
Output is correct |
19 |
Correct |
0 ms |
600 KB |
Output is correct |
20 |
Correct |
1 ms |
604 KB |
Output is correct |
21 |
Correct |
1 ms |
348 KB |
Output is correct |
22 |
Correct |
1 ms |
600 KB |
Output is correct |
23 |
Correct |
1 ms |
860 KB |
Output is correct |
24 |
Correct |
2 ms |
860 KB |
Output is correct |
25 |
Correct |
1 ms |
604 KB |
Output is correct |
26 |
Correct |
1 ms |
604 KB |
Output is correct |
27 |
Correct |
1 ms |
860 KB |
Output is correct |
28 |
Correct |
3 ms |
1628 KB |
Output is correct |
29 |
Correct |
11 ms |
4188 KB |
Output is correct |
30 |
Correct |
3 ms |
1492 KB |
Output is correct |
31 |
Correct |
5 ms |
2652 KB |
Output is correct |
32 |
Correct |
4 ms |
1884 KB |
Output is correct |
33 |
Correct |
26 ms |
8028 KB |
Output is correct |
34 |
Correct |
12 ms |
4440 KB |
Output is correct |
35 |
Correct |
7 ms |
1624 KB |
Output is correct |
36 |
Correct |
2 ms |
604 KB |
Output is correct |
37 |
Correct |
4 ms |
1116 KB |
Output is correct |
38 |
Correct |
5 ms |
1372 KB |
Output is correct |
39 |
Correct |
5 ms |
1372 KB |
Output is correct |
40 |
Correct |
5 ms |
1368 KB |
Output is correct |
41 |
Correct |
6 ms |
1372 KB |
Output is correct |
42 |
Correct |
4 ms |
1372 KB |
Output is correct |
43 |
Correct |
4 ms |
1500 KB |
Output is correct |
44 |
Correct |
4 ms |
1284 KB |
Output is correct |
45 |
Correct |
231 ms |
31496 KB |
Output is correct |
46 |
Correct |
77 ms |
17224 KB |
Output is correct |
47 |
Correct |
5 ms |
2392 KB |
Output is correct |
48 |
Correct |
5 ms |
2812 KB |
Output is correct |
49 |
Correct |
5 ms |
2908 KB |
Output is correct |
50 |
Correct |
4 ms |
2908 KB |
Output is correct |
51 |
Correct |
12 ms |
5976 KB |
Output is correct |
52 |
Correct |
14 ms |
6748 KB |
Output is correct |
53 |
Correct |
8 ms |
3928 KB |
Output is correct |
54 |
Correct |
3 ms |
3420 KB |
Output is correct |
55 |
Correct |
3 ms |
3932 KB |
Output is correct |
56 |
Correct |
11 ms |
5612 KB |
Output is correct |
57 |
Correct |
2 ms |
2652 KB |
Output is correct |
58 |
Correct |
10 ms |
7392 KB |
Output is correct |
59 |
Correct |
13 ms |
6880 KB |
Output is correct |
60 |
Correct |
10 ms |
6880 KB |
Output is correct |
61 |
Correct |
10 ms |
6348 KB |
Output is correct |
62 |
Correct |
169 ms |
31004 KB |
Output is correct |
63 |
Execution timed out |
1048 ms |
99980 KB |
Time limit exceeded |
64 |
Halted |
0 ms |
0 KB |
- |