#include <bits/stdc++.h>
using namespace std;
struct pii {
int x, i;
bool operator<(const pii b) const { return x>b.x; }
};
int main() {
ios_base::sync_with_stdio(false);cin.tie(nullptr);
int N, M, st=0, ed=-1;
cin>>N>>M;
vector<int> D(N, INT_MAX);
vector<vector<int>> A(N);
for(int i=0; i<M; i++) {
int x, m;
cin>>x>>m;
if(i==0) st=x;
else if(i==1) ed=x;
if(max(x, N-1-x)>=m) A[x].push_back(m);
}
for(int i=0; i<N; i++) {
sort(rbegin(A[i]), rend(A[i]));
A[i].erase(unique(begin(A[i]), end(A[i])), end(A[i]));
}
priority_queue<pii> q;
q.push({0, st}); D[st]=0;
while(q.size()) {
auto[n,x]=q.top(); q.pop();
if(D[x]!=n) continue;
if(x==ed) { cout<<n; return 0; }
for(int m:A[x]) {
for(int i=x+m, d=n+1; i<N; i+=m, d++) if(d<D[i]) {
D[i]=d, q.push({d, i});
if(binary_search(rbegin(A[i]), rend(A[i]), m)) break;
}
for(int i=x-m, d=n+1; i>=0; i-=m, d++) if(d<D[i]) {
D[i]=d, q.push({d, i});
if(binary_search(rbegin(A[i]), rend(A[i]), m)) break;
}
}
}
cout<<-1;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
376 KB |
Output is correct |
| 2 |
Correct |
5 ms |
376 KB |
Output is correct |
| 3 |
Correct |
4 ms |
376 KB |
Output is correct |
| 4 |
Correct |
5 ms |
376 KB |
Output is correct |
| 5 |
Correct |
5 ms |
376 KB |
Output is correct |
| 6 |
Correct |
5 ms |
376 KB |
Output is correct |
| 7 |
Correct |
5 ms |
376 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
376 KB |
Output is correct |
| 2 |
Correct |
5 ms |
376 KB |
Output is correct |
| 3 |
Correct |
5 ms |
376 KB |
Output is correct |
| 4 |
Correct |
5 ms |
376 KB |
Output is correct |
| 5 |
Correct |
5 ms |
376 KB |
Output is correct |
| 6 |
Correct |
5 ms |
376 KB |
Output is correct |
| 7 |
Correct |
5 ms |
376 KB |
Output is correct |
| 8 |
Correct |
5 ms |
376 KB |
Output is correct |
| 9 |
Correct |
5 ms |
376 KB |
Output is correct |
| 10 |
Correct |
5 ms |
376 KB |
Output is correct |
| 11 |
Correct |
6 ms |
376 KB |
Output is correct |
| 12 |
Correct |
5 ms |
380 KB |
Output is correct |
| 13 |
Correct |
5 ms |
376 KB |
Output is correct |
| 14 |
Correct |
6 ms |
376 KB |
Output is correct |
| 15 |
Correct |
5 ms |
376 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
376 KB |
Output is correct |
| 2 |
Correct |
5 ms |
376 KB |
Output is correct |
| 3 |
Correct |
5 ms |
376 KB |
Output is correct |
| 4 |
Correct |
5 ms |
376 KB |
Output is correct |
| 5 |
Correct |
5 ms |
376 KB |
Output is correct |
| 6 |
Correct |
5 ms |
376 KB |
Output is correct |
| 7 |
Correct |
5 ms |
376 KB |
Output is correct |
| 8 |
Correct |
4 ms |
376 KB |
Output is correct |
| 9 |
Correct |
5 ms |
376 KB |
Output is correct |
| 10 |
Correct |
5 ms |
376 KB |
Output is correct |
| 11 |
Correct |
5 ms |
376 KB |
Output is correct |
| 12 |
Correct |
5 ms |
392 KB |
Output is correct |
| 13 |
Correct |
5 ms |
376 KB |
Output is correct |
| 14 |
Correct |
5 ms |
376 KB |
Output is correct |
| 15 |
Correct |
5 ms |
376 KB |
Output is correct |
| 16 |
Correct |
5 ms |
380 KB |
Output is correct |
| 17 |
Correct |
5 ms |
376 KB |
Output is correct |
| 18 |
Correct |
5 ms |
376 KB |
Output is correct |
| 19 |
Correct |
5 ms |
376 KB |
Output is correct |
| 20 |
Correct |
7 ms |
504 KB |
Output is correct |
| 21 |
Correct |
5 ms |
376 KB |
Output is correct |
| 22 |
Correct |
5 ms |
376 KB |
Output is correct |
| 23 |
Correct |
6 ms |
376 KB |
Output is correct |
| 24 |
Correct |
6 ms |
504 KB |
Output is correct |
| 25 |
Correct |
5 ms |
504 KB |
Output is correct |
| 26 |
Correct |
5 ms |
376 KB |
Output is correct |
| 27 |
Correct |
5 ms |
376 KB |
Output is correct |
| 28 |
Correct |
6 ms |
376 KB |
Output is correct |
| 29 |
Correct |
6 ms |
504 KB |
Output is correct |
| 30 |
Correct |
5 ms |
504 KB |
Output is correct |
| 31 |
Correct |
5 ms |
504 KB |
Output is correct |
| 32 |
Correct |
5 ms |
504 KB |
Output is correct |
| 33 |
Correct |
6 ms |
504 KB |
Output is correct |
| 34 |
Correct |
6 ms |
504 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
376 KB |
Output is correct |
| 2 |
Correct |
5 ms |
376 KB |
Output is correct |
| 3 |
Correct |
5 ms |
376 KB |
Output is correct |
| 4 |
Correct |
5 ms |
376 KB |
Output is correct |
| 5 |
Correct |
5 ms |
376 KB |
Output is correct |
| 6 |
Correct |
5 ms |
376 KB |
Output is correct |
| 7 |
Correct |
5 ms |
376 KB |
Output is correct |
| 8 |
Correct |
5 ms |
376 KB |
Output is correct |
| 9 |
Correct |
5 ms |
376 KB |
Output is correct |
| 10 |
Correct |
5 ms |
376 KB |
Output is correct |
| 11 |
Correct |
5 ms |
376 KB |
Output is correct |
| 12 |
Correct |
5 ms |
376 KB |
Output is correct |
| 13 |
Correct |
5 ms |
376 KB |
Output is correct |
| 14 |
Correct |
5 ms |
376 KB |
Output is correct |
| 15 |
Correct |
6 ms |
376 KB |
Output is correct |
| 16 |
Correct |
5 ms |
376 KB |
Output is correct |
| 17 |
Correct |
6 ms |
504 KB |
Output is correct |
| 18 |
Correct |
5 ms |
376 KB |
Output is correct |
| 19 |
Correct |
5 ms |
380 KB |
Output is correct |
| 20 |
Correct |
6 ms |
504 KB |
Output is correct |
| 21 |
Correct |
5 ms |
376 KB |
Output is correct |
| 22 |
Correct |
5 ms |
376 KB |
Output is correct |
| 23 |
Correct |
5 ms |
380 KB |
Output is correct |
| 24 |
Correct |
6 ms |
504 KB |
Output is correct |
| 25 |
Correct |
5 ms |
376 KB |
Output is correct |
| 26 |
Correct |
5 ms |
504 KB |
Output is correct |
| 27 |
Correct |
5 ms |
376 KB |
Output is correct |
| 28 |
Correct |
6 ms |
504 KB |
Output is correct |
| 29 |
Correct |
6 ms |
504 KB |
Output is correct |
| 30 |
Correct |
5 ms |
504 KB |
Output is correct |
| 31 |
Correct |
6 ms |
504 KB |
Output is correct |
| 32 |
Correct |
6 ms |
504 KB |
Output is correct |
| 33 |
Correct |
6 ms |
504 KB |
Output is correct |
| 34 |
Correct |
6 ms |
504 KB |
Output is correct |
| 35 |
Correct |
11 ms |
760 KB |
Output is correct |
| 36 |
Correct |
6 ms |
504 KB |
Output is correct |
| 37 |
Correct |
10 ms |
760 KB |
Output is correct |
| 38 |
Correct |
12 ms |
888 KB |
Output is correct |
| 39 |
Correct |
12 ms |
888 KB |
Output is correct |
| 40 |
Correct |
13 ms |
888 KB |
Output is correct |
| 41 |
Correct |
13 ms |
888 KB |
Output is correct |
| 42 |
Correct |
10 ms |
888 KB |
Output is correct |
| 43 |
Correct |
10 ms |
888 KB |
Output is correct |
| 44 |
Correct |
14 ms |
888 KB |
Output is correct |
| 45 |
Correct |
13 ms |
888 KB |
Output is correct |
| 46 |
Correct |
12 ms |
892 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
376 KB |
Output is correct |
| 2 |
Correct |
5 ms |
376 KB |
Output is correct |
| 3 |
Correct |
5 ms |
376 KB |
Output is correct |
| 4 |
Correct |
5 ms |
380 KB |
Output is correct |
| 5 |
Correct |
5 ms |
376 KB |
Output is correct |
| 6 |
Correct |
5 ms |
376 KB |
Output is correct |
| 7 |
Correct |
5 ms |
376 KB |
Output is correct |
| 8 |
Correct |
5 ms |
504 KB |
Output is correct |
| 9 |
Correct |
5 ms |
376 KB |
Output is correct |
| 10 |
Correct |
5 ms |
376 KB |
Output is correct |
| 11 |
Correct |
5 ms |
376 KB |
Output is correct |
| 12 |
Correct |
5 ms |
376 KB |
Output is correct |
| 13 |
Correct |
5 ms |
376 KB |
Output is correct |
| 14 |
Correct |
5 ms |
376 KB |
Output is correct |
| 15 |
Correct |
5 ms |
376 KB |
Output is correct |
| 16 |
Correct |
5 ms |
376 KB |
Output is correct |
| 17 |
Correct |
5 ms |
376 KB |
Output is correct |
| 18 |
Correct |
5 ms |
376 KB |
Output is correct |
| 19 |
Correct |
5 ms |
376 KB |
Output is correct |
| 20 |
Correct |
6 ms |
504 KB |
Output is correct |
| 21 |
Correct |
5 ms |
376 KB |
Output is correct |
| 22 |
Correct |
7 ms |
376 KB |
Output is correct |
| 23 |
Correct |
5 ms |
376 KB |
Output is correct |
| 24 |
Correct |
6 ms |
504 KB |
Output is correct |
| 25 |
Correct |
5 ms |
504 KB |
Output is correct |
| 26 |
Correct |
5 ms |
376 KB |
Output is correct |
| 27 |
Correct |
6 ms |
376 KB |
Output is correct |
| 28 |
Correct |
5 ms |
504 KB |
Output is correct |
| 29 |
Correct |
6 ms |
504 KB |
Output is correct |
| 30 |
Correct |
5 ms |
504 KB |
Output is correct |
| 31 |
Correct |
6 ms |
504 KB |
Output is correct |
| 32 |
Correct |
6 ms |
504 KB |
Output is correct |
| 33 |
Correct |
6 ms |
504 KB |
Output is correct |
| 34 |
Correct |
6 ms |
508 KB |
Output is correct |
| 35 |
Correct |
12 ms |
888 KB |
Output is correct |
| 36 |
Correct |
6 ms |
504 KB |
Output is correct |
| 37 |
Correct |
10 ms |
760 KB |
Output is correct |
| 38 |
Correct |
13 ms |
888 KB |
Output is correct |
| 39 |
Correct |
11 ms |
888 KB |
Output is correct |
| 40 |
Correct |
11 ms |
888 KB |
Output is correct |
| 41 |
Correct |
14 ms |
888 KB |
Output is correct |
| 42 |
Correct |
10 ms |
888 KB |
Output is correct |
| 43 |
Correct |
11 ms |
888 KB |
Output is correct |
| 44 |
Correct |
12 ms |
888 KB |
Output is correct |
| 45 |
Correct |
13 ms |
888 KB |
Output is correct |
| 46 |
Correct |
12 ms |
888 KB |
Output is correct |
| 47 |
Correct |
15 ms |
1912 KB |
Output is correct |
| 48 |
Correct |
12 ms |
1528 KB |
Output is correct |
| 49 |
Correct |
12 ms |
1528 KB |
Output is correct |
| 50 |
Correct |
10 ms |
1528 KB |
Output is correct |
| 51 |
Correct |
20 ms |
2676 KB |
Output is correct |
| 52 |
Correct |
21 ms |
2676 KB |
Output is correct |
| 53 |
Correct |
13 ms |
1912 KB |
Output is correct |
| 54 |
Correct |
7 ms |
1404 KB |
Output is correct |
| 55 |
Correct |
8 ms |
1400 KB |
Output is correct |
| 56 |
Correct |
266 ms |
2296 KB |
Output is correct |
| 57 |
Correct |
7 ms |
1660 KB |
Output is correct |
| 58 |
Correct |
12 ms |
1656 KB |
Output is correct |
| 59 |
Correct |
15 ms |
1784 KB |
Output is correct |
| 60 |
Correct |
13 ms |
1784 KB |
Output is correct |
| 61 |
Correct |
15 ms |
1784 KB |
Output is correct |
| 62 |
Correct |
15 ms |
1912 KB |
Output is correct |
| 63 |
Correct |
28 ms |
2800 KB |
Output is correct |
| 64 |
Correct |
29 ms |
2800 KB |
Output is correct |
| 65 |
Correct |
32 ms |
2800 KB |
Output is correct |
| 66 |
Correct |
37 ms |
2676 KB |
Output is correct |
| 67 |
Correct |
34 ms |
2676 KB |
Output is correct |
