#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n-1;i>=a;i--)
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define SZ(x) ((int)(x).size())
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
const int mod = (int) 1e9 + 7;
const ll inf = 1LL << 60;
const int maxn = (int) 3e4 + 5;
const ld eps = 1e-9;
int n, m, b[maxn], p[maxn], f[maxn];
map<int, int> d[maxn];
vector<int> a[maxn];
deque<pair<int, ii> > pq;
int main() {
//freopen("test.txt", "r", stdin);
ios_base::sync_with_stdio(0); cin.tie(0);
cin >> n >> m;
rep(i, 0, m) {
cin >> b[i] >> p[i];
// b[i] = rand() % n;
// p[i] = rand() % 30000 + 1;
a[b[i]].pb(p[i]);
d[b[i]][p[i]] = mod;
}
rep(i, 0, n) {
sort(all(a[i]));
a[i].resize(unique(all(a[i])) - a[i].begin());
}
d[b[0]][p[0]] = 0;
pq.push_back(make_pair(0, ii(b[0], p[0])));
while(!pq.empty()) {
int du = pq.front().fi;
int u = pq.front().se.fi;
int t = pq.front().se.se;
pq.pop_front();
if(du != d[u][t]) continue;
rep(i, -1, 2) if(i) {
int v = u + i * t;
if(v < 0 || v >= n || v == u) continue;
if(d[v].count(t) && d[v][t] <= du + 1) continue;
d[v][t] = du + 1;
pq.push_back(make_pair(du + 1, ii(v, t)));
}
if(f[u]) continue;
for (auto s : a[u]) {
d[u][s] = du;
pq.push_front(make_pair(du, ii(u, s)));
}
f[u] = 1;
}
if(d[b[1]][p[1]] != mod) cout << d[b[1]][p[1]] << '\n';
else cout << "-1\n";
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
4648 KB |
Output is correct |
2 |
Correct |
0 ms |
4648 KB |
Output is correct |
3 |
Correct |
0 ms |
4648 KB |
Output is correct |
4 |
Correct |
0 ms |
4648 KB |
Output is correct |
5 |
Correct |
0 ms |
4648 KB |
Output is correct |
6 |
Correct |
0 ms |
4648 KB |
Output is correct |
7 |
Correct |
0 ms |
4648 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
4648 KB |
Output is correct |
2 |
Correct |
0 ms |
4648 KB |
Output is correct |
3 |
Correct |
0 ms |
4648 KB |
Output is correct |
4 |
Correct |
0 ms |
4648 KB |
Output is correct |
5 |
Correct |
0 ms |
4648 KB |
Output is correct |
6 |
Correct |
0 ms |
4648 KB |
Output is correct |
7 |
Correct |
0 ms |
4648 KB |
Output is correct |
8 |
Correct |
0 ms |
4648 KB |
Output is correct |
9 |
Correct |
0 ms |
4648 KB |
Output is correct |
10 |
Correct |
0 ms |
4648 KB |
Output is correct |
11 |
Correct |
3 ms |
4780 KB |
Output is correct |
12 |
Correct |
0 ms |
4648 KB |
Output is correct |
13 |
Correct |
0 ms |
4648 KB |
Output is correct |
14 |
Correct |
3 ms |
4912 KB |
Output is correct |
15 |
Correct |
3 ms |
4912 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
4648 KB |
Output is correct |
2 |
Correct |
0 ms |
4648 KB |
Output is correct |
3 |
Correct |
0 ms |
4648 KB |
Output is correct |
4 |
Correct |
0 ms |
4648 KB |
Output is correct |
5 |
Correct |
0 ms |
4648 KB |
Output is correct |
6 |
Correct |
0 ms |
4648 KB |
Output is correct |
7 |
Correct |
0 ms |
4648 KB |
Output is correct |
8 |
Correct |
0 ms |
4648 KB |
Output is correct |
9 |
Correct |
0 ms |
4648 KB |
Output is correct |
10 |
Correct |
0 ms |
4648 KB |
Output is correct |
11 |
Correct |
3 ms |
4780 KB |
Output is correct |
12 |
Correct |
0 ms |
4648 KB |
Output is correct |
13 |
Correct |
0 ms |
4648 KB |
Output is correct |
14 |
Correct |
3 ms |
4912 KB |
Output is correct |
15 |
Correct |
3 ms |
4912 KB |
Output is correct |
16 |
Correct |
0 ms |
4648 KB |
Output is correct |
17 |
Correct |
3 ms |
5308 KB |
Output is correct |
18 |
Correct |
0 ms |
4648 KB |
Output is correct |
19 |
Correct |
0 ms |
4648 KB |
Output is correct |
20 |
Correct |
0 ms |
4780 KB |
Output is correct |
21 |
Correct |
0 ms |
4648 KB |
Output is correct |
22 |
Correct |
0 ms |
4648 KB |
Output is correct |
23 |
Correct |
0 ms |
4912 KB |
Output is correct |
24 |
Correct |
3 ms |
5308 KB |
Output is correct |
25 |
Correct |
3 ms |
5044 KB |
Output is correct |
26 |
Correct |
0 ms |
5044 KB |
Output is correct |
27 |
Correct |
3 ms |
4912 KB |
Output is correct |
28 |
Correct |
9 ms |
5704 KB |
Output is correct |
29 |
Correct |
26 ms |
7552 KB |
Output is correct |
30 |
Correct |
6 ms |
5440 KB |
Output is correct |
31 |
Correct |
13 ms |
6232 KB |
Output is correct |
32 |
Correct |
3 ms |
5704 KB |
Output is correct |
33 |
Correct |
56 ms |
10324 KB |
Output is correct |
34 |
Correct |
63 ms |
10324 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
4648 KB |
Output is correct |
2 |
Correct |
0 ms |
4648 KB |
Output is correct |
3 |
Correct |
0 ms |
4648 KB |
Output is correct |
4 |
Correct |
0 ms |
4648 KB |
Output is correct |
5 |
Correct |
0 ms |
4648 KB |
Output is correct |
6 |
Correct |
0 ms |
4648 KB |
Output is correct |
7 |
Correct |
0 ms |
4648 KB |
Output is correct |
8 |
Correct |
0 ms |
4648 KB |
Output is correct |
9 |
Correct |
0 ms |
4648 KB |
Output is correct |
10 |
Correct |
3 ms |
4648 KB |
Output is correct |
11 |
Correct |
3 ms |
4780 KB |
Output is correct |
12 |
Correct |
0 ms |
4648 KB |
Output is correct |
13 |
Correct |
0 ms |
4648 KB |
Output is correct |
14 |
Correct |
3 ms |
4912 KB |
Output is correct |
15 |
Correct |
3 ms |
4912 KB |
Output is correct |
16 |
Correct |
0 ms |
4648 KB |
Output is correct |
17 |
Correct |
6 ms |
5308 KB |
Output is correct |
18 |
Correct |
0 ms |
4648 KB |
Output is correct |
19 |
Correct |
0 ms |
4648 KB |
Output is correct |
20 |
Correct |
0 ms |
4780 KB |
Output is correct |
21 |
Correct |
0 ms |
4648 KB |
Output is correct |
22 |
Correct |
0 ms |
4648 KB |
Output is correct |
23 |
Correct |
3 ms |
4912 KB |
Output is correct |
24 |
Correct |
6 ms |
5308 KB |
Output is correct |
25 |
Correct |
3 ms |
5044 KB |
Output is correct |
26 |
Correct |
3 ms |
5044 KB |
Output is correct |
27 |
Correct |
3 ms |
4912 KB |
Output is correct |
28 |
Correct |
9 ms |
5704 KB |
Output is correct |
29 |
Correct |
23 ms |
7552 KB |
Output is correct |
30 |
Correct |
3 ms |
5440 KB |
Output is correct |
31 |
Correct |
9 ms |
6232 KB |
Output is correct |
32 |
Correct |
6 ms |
5704 KB |
Output is correct |
33 |
Correct |
49 ms |
10324 KB |
Output is correct |
34 |
Correct |
66 ms |
10324 KB |
Output is correct |
35 |
Correct |
79 ms |
9656 KB |
Output is correct |
36 |
Correct |
9 ms |
5568 KB |
Output is correct |
37 |
Correct |
153 ms |
12964 KB |
Output is correct |
38 |
Correct |
133 ms |
12564 KB |
Output is correct |
39 |
Correct |
133 ms |
12568 KB |
Output is correct |
40 |
Correct |
153 ms |
12560 KB |
Output is correct |
41 |
Correct |
136 ms |
12560 KB |
Output is correct |
42 |
Correct |
9 ms |
5084 KB |
Output is correct |
43 |
Correct |
9 ms |
5088 KB |
Output is correct |
44 |
Correct |
9 ms |
4956 KB |
Output is correct |
45 |
Correct |
379 ms |
27756 KB |
Output is correct |
46 |
Correct |
396 ms |
27756 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
4648 KB |
Output is correct |
2 |
Correct |
0 ms |
4648 KB |
Output is correct |
3 |
Correct |
0 ms |
4648 KB |
Output is correct |
4 |
Correct |
0 ms |
4648 KB |
Output is correct |
5 |
Correct |
0 ms |
4648 KB |
Output is correct |
6 |
Correct |
0 ms |
4648 KB |
Output is correct |
7 |
Correct |
0 ms |
4648 KB |
Output is correct |
8 |
Correct |
0 ms |
4648 KB |
Output is correct |
9 |
Correct |
0 ms |
4648 KB |
Output is correct |
10 |
Correct |
0 ms |
4648 KB |
Output is correct |
11 |
Correct |
0 ms |
4780 KB |
Output is correct |
12 |
Correct |
0 ms |
4648 KB |
Output is correct |
13 |
Correct |
0 ms |
4648 KB |
Output is correct |
14 |
Correct |
3 ms |
4912 KB |
Output is correct |
15 |
Correct |
3 ms |
4912 KB |
Output is correct |
16 |
Correct |
0 ms |
4648 KB |
Output is correct |
17 |
Correct |
6 ms |
5308 KB |
Output is correct |
18 |
Correct |
0 ms |
4648 KB |
Output is correct |
19 |
Correct |
0 ms |
4648 KB |
Output is correct |
20 |
Correct |
0 ms |
4780 KB |
Output is correct |
21 |
Correct |
0 ms |
4648 KB |
Output is correct |
22 |
Correct |
0 ms |
4648 KB |
Output is correct |
23 |
Correct |
3 ms |
4912 KB |
Output is correct |
24 |
Correct |
3 ms |
5308 KB |
Output is correct |
25 |
Correct |
0 ms |
5044 KB |
Output is correct |
26 |
Correct |
3 ms |
5044 KB |
Output is correct |
27 |
Correct |
0 ms |
4912 KB |
Output is correct |
28 |
Correct |
3 ms |
5704 KB |
Output is correct |
29 |
Correct |
23 ms |
7552 KB |
Output is correct |
30 |
Correct |
0 ms |
5440 KB |
Output is correct |
31 |
Correct |
6 ms |
6232 KB |
Output is correct |
32 |
Correct |
6 ms |
5704 KB |
Output is correct |
33 |
Correct |
63 ms |
10324 KB |
Output is correct |
34 |
Correct |
56 ms |
10324 KB |
Output is correct |
35 |
Correct |
93 ms |
9656 KB |
Output is correct |
36 |
Correct |
3 ms |
5568 KB |
Output is correct |
37 |
Correct |
169 ms |
12964 KB |
Output is correct |
38 |
Correct |
139 ms |
12564 KB |
Output is correct |
39 |
Correct |
149 ms |
12568 KB |
Output is correct |
40 |
Correct |
139 ms |
12560 KB |
Output is correct |
41 |
Correct |
143 ms |
12560 KB |
Output is correct |
42 |
Correct |
9 ms |
5084 KB |
Output is correct |
43 |
Correct |
3 ms |
5088 KB |
Output is correct |
44 |
Correct |
3 ms |
4956 KB |
Output is correct |
45 |
Correct |
389 ms |
27756 KB |
Output is correct |
46 |
Correct |
386 ms |
27756 KB |
Output is correct |
47 |
Execution timed out |
1000 ms |
40008 KB |
Execution timed out |
48 |
Halted |
0 ms |
0 KB |
- |