#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#define FOR(i, x, y) for (ll i = x; i < y; i++)
typedef long long ll;
using namespace std;
struct Doge {
ll jumps, pos, size, direction;
};
vector<pair<ll, ll>> sky[300001];
bool visited[300001];
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
fill(visited, visited + 300001, false);
ll n, m;
cin >> n >> m;
ll size = 0, pos = 0;
FOR(i, 0, m) {
ll a, b;
cin >> a >> b;
sky[a].push_back({i, b});
if (i == 0) size = b, pos = a;
}
queue<Doge> q;
q.push({0, pos, size, 1});
q.push({0, pos, size, 0});
while (!q.empty()) {
Doge curr = q.front();
q.pop();
// cout << curr.jumps << ' ' << curr.pos << ' ' << curr.size << ' '
// << curr.direction << '\n';
if (curr.pos > -1 && curr.pos < n) {
if (!visited[curr.pos]) {
visited[curr.pos] = true;
for (auto& i : sky[curr.pos]) {
if (i.first == 1) return cout << curr.jumps << '\n', 0;
if (i.second != curr.size) {
q.push(
{curr.jumps + 1, curr.pos + i.second, i.second, 1});
q.push(
{curr.jumps + 1, curr.pos - i.second, i.second, 0});
}
}
}
if (curr.direction == 1)
q.push({curr.jumps + 1, curr.pos + curr.size, curr.size, 1});
else if (curr.direction == 0)
q.push({curr.jumps + 1, curr.pos - curr.size, curr.size, 0});
}
}
cout << "-1\n";
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
7680 KB |
Output is correct |
2 |
Correct |
8 ms |
7680 KB |
Output is correct |
3 |
Correct |
8 ms |
7680 KB |
Output is correct |
4 |
Correct |
8 ms |
7680 KB |
Output is correct |
5 |
Correct |
8 ms |
7680 KB |
Output is correct |
6 |
Correct |
7 ms |
7680 KB |
Output is correct |
7 |
Correct |
7 ms |
7680 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
7724 KB |
Output is correct |
2 |
Correct |
8 ms |
7680 KB |
Output is correct |
3 |
Correct |
8 ms |
7680 KB |
Output is correct |
4 |
Correct |
8 ms |
7680 KB |
Output is correct |
5 |
Correct |
8 ms |
7680 KB |
Output is correct |
6 |
Correct |
7 ms |
7680 KB |
Output is correct |
7 |
Correct |
7 ms |
7680 KB |
Output is correct |
8 |
Correct |
8 ms |
7688 KB |
Output is correct |
9 |
Correct |
7 ms |
7680 KB |
Output is correct |
10 |
Correct |
7 ms |
7680 KB |
Output is correct |
11 |
Correct |
8 ms |
7808 KB |
Output is correct |
12 |
Correct |
7 ms |
7680 KB |
Output is correct |
13 |
Correct |
7 ms |
7808 KB |
Output is correct |
14 |
Correct |
8 ms |
7884 KB |
Output is correct |
15 |
Correct |
8 ms |
7808 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
7680 KB |
Output is correct |
2 |
Correct |
8 ms |
7680 KB |
Output is correct |
3 |
Correct |
7 ms |
7680 KB |
Output is correct |
4 |
Correct |
7 ms |
7680 KB |
Output is correct |
5 |
Correct |
8 ms |
7680 KB |
Output is correct |
6 |
Correct |
7 ms |
7680 KB |
Output is correct |
7 |
Correct |
8 ms |
7680 KB |
Output is correct |
8 |
Correct |
7 ms |
7680 KB |
Output is correct |
9 |
Correct |
8 ms |
7680 KB |
Output is correct |
10 |
Correct |
8 ms |
7680 KB |
Output is correct |
11 |
Correct |
8 ms |
7680 KB |
Output is correct |
12 |
Correct |
8 ms |
7808 KB |
Output is correct |
13 |
Correct |
8 ms |
7808 KB |
Output is correct |
14 |
Correct |
8 ms |
7936 KB |
Output is correct |
15 |
Correct |
8 ms |
7980 KB |
Output is correct |
16 |
Correct |
8 ms |
7680 KB |
Output is correct |
17 |
Correct |
8 ms |
7808 KB |
Output is correct |
18 |
Correct |
8 ms |
7680 KB |
Output is correct |
19 |
Correct |
8 ms |
7680 KB |
Output is correct |
20 |
Correct |
8 ms |
7808 KB |
Output is correct |
21 |
Correct |
8 ms |
7680 KB |
Output is correct |
22 |
Correct |
8 ms |
7680 KB |
Output is correct |
23 |
Correct |
8 ms |
7680 KB |
Output is correct |
24 |
Correct |
9 ms |
7808 KB |
Output is correct |
25 |
Correct |
9 ms |
7680 KB |
Output is correct |
26 |
Correct |
8 ms |
7808 KB |
Output is correct |
27 |
Correct |
8 ms |
7680 KB |
Output is correct |
28 |
Correct |
9 ms |
7808 KB |
Output is correct |
29 |
Correct |
9 ms |
7808 KB |
Output is correct |
30 |
Correct |
8 ms |
7680 KB |
Output is correct |
31 |
Correct |
8 ms |
7680 KB |
Output is correct |
32 |
Correct |
8 ms |
7680 KB |
Output is correct |
33 |
Correct |
11 ms |
7936 KB |
Output is correct |
34 |
Correct |
9 ms |
7888 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
7680 KB |
Output is correct |
2 |
Correct |
8 ms |
7680 KB |
Output is correct |
3 |
Correct |
8 ms |
7680 KB |
Output is correct |
4 |
Correct |
8 ms |
7680 KB |
Output is correct |
5 |
Correct |
7 ms |
7680 KB |
Output is correct |
6 |
Correct |
7 ms |
7680 KB |
Output is correct |
7 |
Correct |
7 ms |
7808 KB |
Output is correct |
8 |
Correct |
7 ms |
7680 KB |
Output is correct |
9 |
Correct |
7 ms |
7680 KB |
Output is correct |
10 |
Correct |
7 ms |
7680 KB |
Output is correct |
11 |
Correct |
8 ms |
7680 KB |
Output is correct |
12 |
Correct |
8 ms |
7680 KB |
Output is correct |
13 |
Correct |
7 ms |
7680 KB |
Output is correct |
14 |
Correct |
8 ms |
7936 KB |
Output is correct |
15 |
Correct |
8 ms |
7808 KB |
Output is correct |
16 |
Correct |
8 ms |
7680 KB |
Output is correct |
17 |
Correct |
8 ms |
7808 KB |
Output is correct |
18 |
Correct |
8 ms |
7680 KB |
Output is correct |
19 |
Correct |
7 ms |
7680 KB |
Output is correct |
20 |
Correct |
8 ms |
7808 KB |
Output is correct |
21 |
Correct |
7 ms |
7680 KB |
Output is correct |
22 |
Correct |
8 ms |
7680 KB |
Output is correct |
23 |
Correct |
8 ms |
7680 KB |
Output is correct |
24 |
Correct |
8 ms |
7808 KB |
Output is correct |
25 |
Correct |
7 ms |
7680 KB |
Output is correct |
26 |
Correct |
8 ms |
7808 KB |
Output is correct |
27 |
Correct |
8 ms |
7808 KB |
Output is correct |
28 |
Correct |
8 ms |
7808 KB |
Output is correct |
29 |
Correct |
9 ms |
7680 KB |
Output is correct |
30 |
Correct |
8 ms |
7680 KB |
Output is correct |
31 |
Correct |
8 ms |
7680 KB |
Output is correct |
32 |
Correct |
8 ms |
7680 KB |
Output is correct |
33 |
Correct |
10 ms |
7936 KB |
Output is correct |
34 |
Correct |
9 ms |
7888 KB |
Output is correct |
35 |
Correct |
15 ms |
9728 KB |
Output is correct |
36 |
Correct |
10 ms |
7804 KB |
Output is correct |
37 |
Correct |
13 ms |
8832 KB |
Output is correct |
38 |
Correct |
16 ms |
9856 KB |
Output is correct |
39 |
Correct |
15 ms |
8448 KB |
Output is correct |
40 |
Correct |
14 ms |
8576 KB |
Output is correct |
41 |
Correct |
17 ms |
9984 KB |
Output is correct |
42 |
Correct |
12 ms |
8320 KB |
Output is correct |
43 |
Correct |
12 ms |
8320 KB |
Output is correct |
44 |
Correct |
13 ms |
8340 KB |
Output is correct |
45 |
Correct |
22 ms |
10240 KB |
Output is correct |
46 |
Correct |
19 ms |
10368 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
7680 KB |
Output is correct |
2 |
Correct |
8 ms |
7680 KB |
Output is correct |
3 |
Correct |
7 ms |
7680 KB |
Output is correct |
4 |
Correct |
8 ms |
7680 KB |
Output is correct |
5 |
Correct |
8 ms |
7680 KB |
Output is correct |
6 |
Correct |
7 ms |
7680 KB |
Output is correct |
7 |
Correct |
7 ms |
7680 KB |
Output is correct |
8 |
Correct |
7 ms |
7680 KB |
Output is correct |
9 |
Correct |
8 ms |
7680 KB |
Output is correct |
10 |
Correct |
8 ms |
7808 KB |
Output is correct |
11 |
Correct |
8 ms |
7808 KB |
Output is correct |
12 |
Correct |
7 ms |
7808 KB |
Output is correct |
13 |
Correct |
8 ms |
7808 KB |
Output is correct |
14 |
Correct |
7 ms |
7808 KB |
Output is correct |
15 |
Correct |
8 ms |
7936 KB |
Output is correct |
16 |
Correct |
7 ms |
7680 KB |
Output is correct |
17 |
Correct |
8 ms |
7808 KB |
Output is correct |
18 |
Correct |
7 ms |
7680 KB |
Output is correct |
19 |
Correct |
8 ms |
7680 KB |
Output is correct |
20 |
Correct |
8 ms |
7808 KB |
Output is correct |
21 |
Correct |
8 ms |
7680 KB |
Output is correct |
22 |
Correct |
8 ms |
7680 KB |
Output is correct |
23 |
Correct |
8 ms |
7680 KB |
Output is correct |
24 |
Correct |
8 ms |
7808 KB |
Output is correct |
25 |
Correct |
8 ms |
7852 KB |
Output is correct |
26 |
Correct |
7 ms |
7680 KB |
Output is correct |
27 |
Correct |
8 ms |
7808 KB |
Output is correct |
28 |
Correct |
8 ms |
7808 KB |
Output is correct |
29 |
Correct |
9 ms |
7808 KB |
Output is correct |
30 |
Correct |
7 ms |
7680 KB |
Output is correct |
31 |
Correct |
8 ms |
7680 KB |
Output is correct |
32 |
Correct |
9 ms |
7680 KB |
Output is correct |
33 |
Correct |
10 ms |
7888 KB |
Output is correct |
34 |
Correct |
9 ms |
7888 KB |
Output is correct |
35 |
Correct |
14 ms |
9728 KB |
Output is correct |
36 |
Correct |
9 ms |
7936 KB |
Output is correct |
37 |
Correct |
13 ms |
8832 KB |
Output is correct |
38 |
Correct |
15 ms |
9940 KB |
Output is correct |
39 |
Correct |
15 ms |
8448 KB |
Output is correct |
40 |
Correct |
15 ms |
8552 KB |
Output is correct |
41 |
Correct |
16 ms |
9984 KB |
Output is correct |
42 |
Correct |
13 ms |
8320 KB |
Output is correct |
43 |
Correct |
12 ms |
8320 KB |
Output is correct |
44 |
Correct |
13 ms |
8340 KB |
Output is correct |
45 |
Correct |
21 ms |
10240 KB |
Output is correct |
46 |
Correct |
17 ms |
10396 KB |
Output is correct |
47 |
Correct |
15 ms |
8824 KB |
Output is correct |
48 |
Correct |
14 ms |
8292 KB |
Output is correct |
49 |
Correct |
14 ms |
8192 KB |
Output is correct |
50 |
Correct |
12 ms |
8192 KB |
Output is correct |
51 |
Correct |
17 ms |
8876 KB |
Output is correct |
52 |
Correct |
19 ms |
8960 KB |
Output is correct |
53 |
Correct |
17 ms |
8448 KB |
Output is correct |
54 |
Correct |
7 ms |
7680 KB |
Output is correct |
55 |
Correct |
8 ms |
7700 KB |
Output is correct |
56 |
Correct |
15 ms |
8704 KB |
Output is correct |
57 |
Correct |
8 ms |
7808 KB |
Output is correct |
58 |
Execution timed out |
1086 ms |
10228 KB |
Time limit exceeded |
59 |
Halted |
0 ms |
0 KB |
- |