#include "bits/stdc++.h"
#define ll long long int
#define pb push_back
#define pii pair<int,int>
#define ff first
#define ss second
#define sz size()
const int N = 2e5 + 1;
using namespace std;
int n, m, b[N], p[N];
vector <vector<pii>> v;
priority_queue <pii> pq;
vector <int> dis(N,1e9);
map <pii,int> mp;
void f(){
pq.push({0,b[1]});
dis[b[1]] = 0;
while(!pq.empty()){
int a = pq.top().ss;
pq.pop();
for(auto i: v[a]){
if(dis[a] + i.ss < dis[i.ff]){
dis[i.ff] = dis[a] + i.ss;
pq.push({-dis[i.ff],i.ff});
}
}
}
}
int main(){
ios::sync_with_stdio(false); cin.tie(nullptr);
//freopen("input.in", "r", stdin);
//freopen("output.out", "w", stdout);
cin >> n >> m;
for(int i = 1; i <= m; i++){
cin >> b[i] >> p[i];
mp[{b[i],p[i]}] = 1;
}
v.resize(n+1);
for(int i = 1; i <= m; i++){
int nd = b[i], cnt = 0;
while(1){
nd -= p[i];
if(nd < 0) break;
cnt++;
v[b[i]].pb({nd,cnt});
if(mp.find({nd,p[i]}) != mp.end()) break;
}
nd = b[i], cnt = 0;
while(1){
nd += p[i];
if(nd > n-1) break;
cnt++;
v[b[i]].pb({nd,cnt});
if(mp.find({nd,p[i]}) != mp.end()) break;
}
}
f();
cout << (dis[b[2]] == 1e9 ? -1 : dis[b[2]]);
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
1116 KB |
Output is correct |
2 |
Correct |
1 ms |
1116 KB |
Output is correct |
3 |
Correct |
1 ms |
1116 KB |
Output is correct |
4 |
Correct |
1 ms |
1116 KB |
Output is correct |
5 |
Correct |
1 ms |
1116 KB |
Output is correct |
6 |
Correct |
1 ms |
1116 KB |
Output is correct |
7 |
Correct |
1 ms |
1116 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1116 KB |
Output is correct |
2 |
Correct |
1 ms |
1116 KB |
Output is correct |
3 |
Correct |
1 ms |
1116 KB |
Output is correct |
4 |
Correct |
1 ms |
1260 KB |
Output is correct |
5 |
Correct |
1 ms |
1116 KB |
Output is correct |
6 |
Correct |
1 ms |
1116 KB |
Output is correct |
7 |
Correct |
1 ms |
1260 KB |
Output is correct |
8 |
Correct |
1 ms |
1112 KB |
Output is correct |
9 |
Correct |
2 ms |
1116 KB |
Output is correct |
10 |
Correct |
1 ms |
1116 KB |
Output is correct |
11 |
Correct |
2 ms |
1372 KB |
Output is correct |
12 |
Correct |
4 ms |
3288 KB |
Output is correct |
13 |
Correct |
1 ms |
1112 KB |
Output is correct |
14 |
Correct |
2 ms |
1624 KB |
Output is correct |
15 |
Correct |
2 ms |
1372 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1116 KB |
Output is correct |
2 |
Correct |
1 ms |
1116 KB |
Output is correct |
3 |
Correct |
1 ms |
1368 KB |
Output is correct |
4 |
Correct |
1 ms |
1116 KB |
Output is correct |
5 |
Correct |
1 ms |
1160 KB |
Output is correct |
6 |
Correct |
1 ms |
1116 KB |
Output is correct |
7 |
Correct |
1 ms |
1116 KB |
Output is correct |
8 |
Correct |
1 ms |
1112 KB |
Output is correct |
9 |
Correct |
1 ms |
1116 KB |
Output is correct |
10 |
Correct |
1 ms |
1116 KB |
Output is correct |
11 |
Correct |
2 ms |
1372 KB |
Output is correct |
12 |
Correct |
4 ms |
3288 KB |
Output is correct |
13 |
Correct |
2 ms |
1116 KB |
Output is correct |
14 |
Correct |
2 ms |
1400 KB |
Output is correct |
15 |
Correct |
1 ms |
1372 KB |
Output is correct |
16 |
Correct |
2 ms |
1372 KB |
Output is correct |
17 |
Correct |
3 ms |
1536 KB |
Output is correct |
18 |
Correct |
2 ms |
1368 KB |
Output is correct |
19 |
Correct |
1 ms |
1372 KB |
Output is correct |
20 |
Correct |
2 ms |
1372 KB |
Output is correct |
21 |
Correct |
1 ms |
1372 KB |
Output is correct |
22 |
Correct |
1 ms |
1372 KB |
Output is correct |
23 |
Correct |
2 ms |
1372 KB |
Output is correct |
24 |
Correct |
3 ms |
1372 KB |
Output is correct |
25 |
Correct |
2 ms |
1372 KB |
Output is correct |
26 |
Correct |
59 ms |
35692 KB |
Output is correct |
27 |
Correct |
62 ms |
35248 KB |
Output is correct |
28 |
Correct |
4 ms |
1628 KB |
Output is correct |
29 |
Correct |
3 ms |
2140 KB |
Output is correct |
30 |
Correct |
2 ms |
1368 KB |
Output is correct |
31 |
Correct |
3 ms |
1628 KB |
Output is correct |
32 |
Correct |
2 ms |
1624 KB |
Output is correct |
33 |
Correct |
4 ms |
2908 KB |
Output is correct |
34 |
Correct |
5 ms |
2908 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1116 KB |
Output is correct |
2 |
Correct |
1 ms |
1112 KB |
Output is correct |
3 |
Correct |
1 ms |
1368 KB |
Output is correct |
4 |
Correct |
1 ms |
1116 KB |
Output is correct |
5 |
Correct |
1 ms |
1268 KB |
Output is correct |
6 |
Correct |
1 ms |
1116 KB |
Output is correct |
7 |
Correct |
1 ms |
1256 KB |
Output is correct |
8 |
Correct |
1 ms |
1116 KB |
Output is correct |
9 |
Correct |
1 ms |
1116 KB |
Output is correct |
10 |
Correct |
1 ms |
1116 KB |
Output is correct |
11 |
Correct |
2 ms |
1372 KB |
Output is correct |
12 |
Correct |
5 ms |
3288 KB |
Output is correct |
13 |
Correct |
1 ms |
1116 KB |
Output is correct |
14 |
Correct |
1 ms |
1372 KB |
Output is correct |
15 |
Correct |
2 ms |
1372 KB |
Output is correct |
16 |
Correct |
1 ms |
1372 KB |
Output is correct |
17 |
Correct |
3 ms |
1372 KB |
Output is correct |
18 |
Correct |
1 ms |
1368 KB |
Output is correct |
19 |
Correct |
1 ms |
1372 KB |
Output is correct |
20 |
Correct |
2 ms |
1372 KB |
Output is correct |
21 |
Correct |
1 ms |
1372 KB |
Output is correct |
22 |
Correct |
1 ms |
1372 KB |
Output is correct |
23 |
Correct |
2 ms |
1372 KB |
Output is correct |
24 |
Correct |
3 ms |
1628 KB |
Output is correct |
25 |
Correct |
2 ms |
1372 KB |
Output is correct |
26 |
Correct |
59 ms |
35956 KB |
Output is correct |
27 |
Correct |
61 ms |
35760 KB |
Output is correct |
28 |
Correct |
3 ms |
1628 KB |
Output is correct |
29 |
Correct |
3 ms |
2140 KB |
Output is correct |
30 |
Correct |
1 ms |
1372 KB |
Output is correct |
31 |
Correct |
2 ms |
1628 KB |
Output is correct |
32 |
Correct |
2 ms |
1628 KB |
Output is correct |
33 |
Correct |
4 ms |
2908 KB |
Output is correct |
34 |
Correct |
5 ms |
2908 KB |
Output is correct |
35 |
Correct |
27 ms |
4164 KB |
Output is correct |
36 |
Correct |
4 ms |
1628 KB |
Output is correct |
37 |
Correct |
34 ms |
4948 KB |
Output is correct |
38 |
Correct |
36 ms |
5456 KB |
Output is correct |
39 |
Correct |
36 ms |
5456 KB |
Output is correct |
40 |
Correct |
35 ms |
5456 KB |
Output is correct |
41 |
Correct |
37 ms |
5520 KB |
Output is correct |
42 |
Runtime error |
349 ms |
262144 KB |
Execution killed with signal 9 |
43 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1116 KB |
Output is correct |
2 |
Correct |
1 ms |
1116 KB |
Output is correct |
3 |
Correct |
1 ms |
1116 KB |
Output is correct |
4 |
Correct |
1 ms |
1116 KB |
Output is correct |
5 |
Correct |
2 ms |
1364 KB |
Output is correct |
6 |
Correct |
1 ms |
1116 KB |
Output is correct |
7 |
Correct |
1 ms |
1116 KB |
Output is correct |
8 |
Correct |
1 ms |
1116 KB |
Output is correct |
9 |
Correct |
1 ms |
1116 KB |
Output is correct |
10 |
Correct |
1 ms |
1116 KB |
Output is correct |
11 |
Correct |
2 ms |
1372 KB |
Output is correct |
12 |
Correct |
4 ms |
3288 KB |
Output is correct |
13 |
Correct |
1 ms |
1116 KB |
Output is correct |
14 |
Correct |
1 ms |
1372 KB |
Output is correct |
15 |
Correct |
2 ms |
1372 KB |
Output is correct |
16 |
Correct |
1 ms |
1372 KB |
Output is correct |
17 |
Correct |
3 ms |
1372 KB |
Output is correct |
18 |
Correct |
2 ms |
1372 KB |
Output is correct |
19 |
Correct |
1 ms |
1372 KB |
Output is correct |
20 |
Correct |
2 ms |
1372 KB |
Output is correct |
21 |
Correct |
1 ms |
1372 KB |
Output is correct |
22 |
Correct |
1 ms |
1372 KB |
Output is correct |
23 |
Correct |
2 ms |
1372 KB |
Output is correct |
24 |
Correct |
3 ms |
1372 KB |
Output is correct |
25 |
Correct |
2 ms |
1372 KB |
Output is correct |
26 |
Correct |
58 ms |
35480 KB |
Output is correct |
27 |
Correct |
68 ms |
34480 KB |
Output is correct |
28 |
Correct |
3 ms |
1628 KB |
Output is correct |
29 |
Correct |
3 ms |
2140 KB |
Output is correct |
30 |
Correct |
2 ms |
1372 KB |
Output is correct |
31 |
Correct |
2 ms |
1628 KB |
Output is correct |
32 |
Correct |
2 ms |
1628 KB |
Output is correct |
33 |
Correct |
7 ms |
2908 KB |
Output is correct |
34 |
Correct |
5 ms |
2904 KB |
Output is correct |
35 |
Correct |
23 ms |
4380 KB |
Output is correct |
36 |
Correct |
4 ms |
1880 KB |
Output is correct |
37 |
Correct |
34 ms |
4948 KB |
Output is correct |
38 |
Correct |
36 ms |
5460 KB |
Output is correct |
39 |
Correct |
36 ms |
5456 KB |
Output is correct |
40 |
Correct |
36 ms |
5468 KB |
Output is correct |
41 |
Correct |
36 ms |
5468 KB |
Output is correct |
42 |
Runtime error |
322 ms |
262144 KB |
Execution killed with signal 9 |
43 |
Halted |
0 ms |
0 KB |
- |