#include <bits/stdc++.h>
using namespace std;
#define MAXN 30005
#define pb push_back
#define mp make_pair
typedef pair<int, int> pii;
int N, M, S, E;
int D[MAXN];
bool V[MAXN][200];
vector <int> doge[MAXN];
int main()
{
scanf("%d%d", &N, &M);
for (int i=0;i<M;i++){
int b, p;
scanf("%d%d", &b, &p);
if (p > 199 || !V[b][p]) doge[b].pb(p);
if (p < 200) V[b][p] = 1;
if (!i) S = b;
if (i == 1) E = b;
}
for (int i=0;i<N;i++) D[i] = 2e9;
priority_queue <pii> que;
D[S] = 0;
que.push(mp(0, S));
while (!que.empty()){
int q = que.top().second, d = -que.top().first; que.pop();
if (D[q] != d) continue;
for (int p: doge[q]){
for (int i=q-p;i>=0;i-=p){
if (D[i] > d+(q-i)/p)
D[i] = d+(q-i)/p, que.push(mp(-D[i], i));
if (p < 200 && V[i][p]) break;
}
for (int i=q+p;i<N;i+=p){
if (D[i] > d+(i-q)/p)
D[i] = d+(i-q)/p, que.push(mp(-D[i], i));
if (p < 200 && V[i][p]) break;
}
}
}
printf("%d\n", D[E] < 2e9 ? D[E] : -1);
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 2 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 3 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 4 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 5 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 6 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 7 |
Correct |
0 ms |
8400 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 2 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 3 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 4 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 5 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 6 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 7 |
Correct |
1 ms |
8400 KB |
Output is correct |
| 8 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 9 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 10 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 11 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 12 |
Correct |
1 ms |
8400 KB |
Output is correct |
| 13 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 14 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 15 |
Correct |
1 ms |
8400 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 2 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 3 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 4 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 5 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 6 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 7 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 8 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 9 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 10 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 11 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 12 |
Correct |
1 ms |
8400 KB |
Output is correct |
| 13 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 14 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 15 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 16 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 17 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 18 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 19 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 20 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 21 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 22 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 23 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 24 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 25 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 26 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 27 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 28 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 29 |
Correct |
2 ms |
8536 KB |
Output is correct |
| 30 |
Correct |
2 ms |
8400 KB |
Output is correct |
| 31 |
Correct |
0 ms |
8536 KB |
Output is correct |
| 32 |
Correct |
0 ms |
8536 KB |
Output is correct |
| 33 |
Correct |
4 ms |
8544 KB |
Output is correct |
| 34 |
Correct |
0 ms |
8544 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 2 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 3 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 4 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 5 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 6 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 7 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 8 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 9 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 10 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 11 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 12 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 13 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 14 |
Correct |
1 ms |
8400 KB |
Output is correct |
| 15 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 16 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 17 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 18 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 19 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 20 |
Correct |
2 ms |
8400 KB |
Output is correct |
| 21 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 22 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 23 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 24 |
Correct |
3 ms |
8400 KB |
Output is correct |
| 25 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 26 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 27 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 28 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 29 |
Correct |
3 ms |
8536 KB |
Output is correct |
| 30 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 31 |
Correct |
0 ms |
8536 KB |
Output is correct |
| 32 |
Correct |
1 ms |
8536 KB |
Output is correct |
| 33 |
Correct |
2 ms |
8544 KB |
Output is correct |
| 34 |
Correct |
4 ms |
8544 KB |
Output is correct |
| 35 |
Correct |
10 ms |
8664 KB |
Output is correct |
| 36 |
Correct |
3 ms |
8400 KB |
Output is correct |
| 37 |
Correct |
10 ms |
8700 KB |
Output is correct |
| 38 |
Correct |
15 ms |
8664 KB |
Output is correct |
| 39 |
Correct |
14 ms |
8664 KB |
Output is correct |
| 40 |
Correct |
12 ms |
8664 KB |
Output is correct |
| 41 |
Correct |
15 ms |
8664 KB |
Output is correct |
| 42 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 43 |
Correct |
4 ms |
8400 KB |
Output is correct |
| 44 |
Correct |
5 ms |
8400 KB |
Output is correct |
| 45 |
Correct |
15 ms |
8708 KB |
Output is correct |
| 46 |
Correct |
13 ms |
8704 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
8400 KB |
Output is correct |
| 2 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 3 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 4 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 5 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 6 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 7 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 8 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 9 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 10 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 11 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 12 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 13 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 14 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 15 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 16 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 17 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 18 |
Correct |
1 ms |
8400 KB |
Output is correct |
| 19 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 20 |
Correct |
2 ms |
8400 KB |
Output is correct |
| 21 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 22 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 23 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 24 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 25 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 26 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 27 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 28 |
Correct |
2 ms |
8400 KB |
Output is correct |
| 29 |
Correct |
3 ms |
8536 KB |
Output is correct |
| 30 |
Correct |
0 ms |
8400 KB |
Output is correct |
| 31 |
Correct |
2 ms |
8536 KB |
Output is correct |
| 32 |
Correct |
0 ms |
8536 KB |
Output is correct |
| 33 |
Correct |
3 ms |
8544 KB |
Output is correct |
| 34 |
Correct |
3 ms |
8544 KB |
Output is correct |
| 35 |
Correct |
12 ms |
8664 KB |
Output is correct |
| 36 |
Correct |
2 ms |
8400 KB |
Output is correct |
| 37 |
Correct |
11 ms |
8700 KB |
Output is correct |
| 38 |
Correct |
14 ms |
8664 KB |
Output is correct |
| 39 |
Correct |
15 ms |
8664 KB |
Output is correct |
| 40 |
Correct |
8 ms |
8664 KB |
Output is correct |
| 41 |
Correct |
7 ms |
8664 KB |
Output is correct |
| 42 |
Correct |
6 ms |
8400 KB |
Output is correct |
| 43 |
Correct |
7 ms |
8400 KB |
Output is correct |
| 44 |
Correct |
8 ms |
8400 KB |
Output is correct |
| 45 |
Correct |
7 ms |
8708 KB |
Output is correct |
| 46 |
Correct |
14 ms |
8704 KB |
Output is correct |
| 47 |
Correct |
29 ms |
9516 KB |
Output is correct |
| 48 |
Correct |
12 ms |
8796 KB |
Output is correct |
| 49 |
Correct |
0 ms |
8796 KB |
Output is correct |
| 50 |
Correct |
0 ms |
8664 KB |
Output is correct |
| 51 |
Correct |
32 ms |
9764 KB |
Output is correct |
| 52 |
Correct |
37 ms |
9768 KB |
Output is correct |
| 53 |
Correct |
19 ms |
9768 KB |
Output is correct |
| 54 |
Correct |
4 ms |
8532 KB |
Output is correct |
| 55 |
Correct |
3 ms |
8532 KB |
Output is correct |
| 56 |
Correct |
13 ms |
9324 KB |
Output is correct |
| 57 |
Correct |
36 ms |
9244 KB |
Output is correct |
| 58 |
Correct |
11 ms |
8532 KB |
Output is correct |
| 59 |
Correct |
14 ms |
8532 KB |
Output is correct |
| 60 |
Correct |
7 ms |
8536 KB |
Output is correct |
| 61 |
Correct |
9 ms |
8556 KB |
Output is correct |
| 62 |
Correct |
19 ms |
9324 KB |
Output is correct |
| 63 |
Correct |
40 ms |
10180 KB |
Output is correct |
| 64 |
Correct |
45 ms |
10140 KB |
Output is correct |
| 65 |
Correct |
57 ms |
10152 KB |
Output is correct |
| 66 |
Correct |
101 ms |
11652 KB |
Output is correct |
| 67 |
Correct |
96 ms |
11656 KB |
Output is correct |
