#pragma GCC optimize("Ofast")
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
typedef pair<pair<int,int>,int> pp;
int N,M;
int B[30005],P[30005];
vector<int> V[30005];
priority_queue<pp> Q;
int main(){
cin>>N>>M;
for(int i=0;i<M;i++){
cin>>B[i]>>P[i];
if(i)
V[B[i]].push_back(i);
}
//dist pos ind
Q.push({{0,B[0]},0});
while(!Q.empty()){
pp p=Q.top();
Q.pop();
//cout<<Q.size()<<" "<<p.second<<" "<<p.first.first<<" "<<p.first.second<<endl;
if(p.second==1){
cout<<-p.first.first;
return 0;
}
for(int x:V[p.first.second])
Q.push({{p.first.first,B[x]},x});
V[p.first.second].clear();
if(p.first.second==B[p.second]){
for(int k=1;;k++){
if(p.first.second-k*P[p.second]<0)
break;
if(!V[p.first.second-k*P[p.second]].empty()){
Q.push({{p.first.first-k,p.first.second-k*P[p.second]},p.second});
break;
}
}
for(int k=1;;k++){
if(p.first.second+k*P[p.second]>=N)
break;
if(!V[p.first.second+k*P[p.second]].empty()){
Q.push({{p.first.first-k,p.first.second+k*P[p.second]},p.second});
break;
}
}
}
if(p.first.second<B[p.second]){
for(int k=1;;k++){
if(p.first.second-k*P[p.second]<0)
break;
if(!V[p.first.second-k*P[p.second]].empty()){
Q.push({{p.first.first-k,p.first.second-k*P[p.second]},p.second});
break;
}
}
}
if(p.first.second>B[p.second]){
for(int k=1;;k++){
if(p.first.second+k*P[p.second]>=N)
break;
if(!V[p.first.second+k*P[p.second]].empty()){
Q.push({{p.first.first-k,p.first.second+k*P[p.second]},p.second});
break;
}
}
}
}
cout<<-1;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1016 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1208 KB |
Output is correct |
| 3 |
Correct |
4 ms |
1208 KB |
Output is correct |
| 4 |
Correct |
4 ms |
1240 KB |
Output is correct |
| 5 |
Correct |
4 ms |
1240 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1268 KB |
Output is correct |
| 7 |
Correct |
4 ms |
1296 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1296 KB |
Output is correct |
| 2 |
Correct |
4 ms |
1296 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1296 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1296 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1296 KB |
Output is correct |
| 6 |
Correct |
2 ms |
1296 KB |
Output is correct |
| 7 |
Correct |
4 ms |
1296 KB |
Output is correct |
| 8 |
Correct |
4 ms |
1296 KB |
Output is correct |
| 9 |
Correct |
4 ms |
1296 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1296 KB |
Output is correct |
| 11 |
Correct |
4 ms |
1296 KB |
Output is correct |
| 12 |
Correct |
5 ms |
1384 KB |
Output is correct |
| 13 |
Correct |
5 ms |
1388 KB |
Output is correct |
| 14 |
Correct |
5 ms |
1388 KB |
Output is correct |
| 15 |
Correct |
5 ms |
1388 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1388 KB |
Output is correct |
| 2 |
Correct |
4 ms |
1388 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1388 KB |
Output is correct |
| 4 |
Correct |
4 ms |
1388 KB |
Output is correct |
| 5 |
Correct |
2 ms |
1388 KB |
Output is correct |
| 6 |
Correct |
4 ms |
1388 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1388 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1388 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1388 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1388 KB |
Output is correct |
| 11 |
Correct |
4 ms |
1388 KB |
Output is correct |
| 12 |
Correct |
6 ms |
1404 KB |
Output is correct |
| 13 |
Correct |
6 ms |
1404 KB |
Output is correct |
| 14 |
Correct |
5 ms |
1404 KB |
Output is correct |
| 15 |
Correct |
4 ms |
1404 KB |
Output is correct |
| 16 |
Correct |
4 ms |
1404 KB |
Output is correct |
| 17 |
Correct |
5 ms |
1404 KB |
Output is correct |
| 18 |
Correct |
4 ms |
1404 KB |
Output is correct |
| 19 |
Correct |
5 ms |
1404 KB |
Output is correct |
| 20 |
Correct |
325 ms |
1532 KB |
Output is correct |
| 21 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 22 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 23 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 24 |
Correct |
5 ms |
1532 KB |
Output is correct |
| 25 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 26 |
Correct |
5 ms |
1532 KB |
Output is correct |
| 27 |
Correct |
9 ms |
1532 KB |
Output is correct |
| 28 |
Correct |
5 ms |
1532 KB |
Output is correct |
| 29 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 30 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 31 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 32 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 33 |
Correct |
5 ms |
1532 KB |
Output is correct |
| 34 |
Correct |
5 ms |
1532 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 8 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 9 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 11 |
Correct |
6 ms |
1532 KB |
Output is correct |
| 12 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 13 |
Correct |
5 ms |
1532 KB |
Output is correct |
| 14 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 15 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 16 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 17 |
Correct |
5 ms |
1532 KB |
Output is correct |
| 18 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 19 |
Correct |
3 ms |
1532 KB |
Output is correct |
| 20 |
Correct |
268 ms |
1660 KB |
Output is correct |
| 21 |
Correct |
3 ms |
1660 KB |
Output is correct |
| 22 |
Correct |
3 ms |
1660 KB |
Output is correct |
| 23 |
Correct |
3 ms |
1660 KB |
Output is correct |
| 24 |
Correct |
5 ms |
1660 KB |
Output is correct |
| 25 |
Correct |
4 ms |
1660 KB |
Output is correct |
| 26 |
Correct |
4 ms |
1660 KB |
Output is correct |
| 27 |
Correct |
10 ms |
1660 KB |
Output is correct |
| 28 |
Correct |
5 ms |
1660 KB |
Output is correct |
| 29 |
Correct |
3 ms |
1660 KB |
Output is correct |
| 30 |
Correct |
3 ms |
1660 KB |
Output is correct |
| 31 |
Correct |
4 ms |
1660 KB |
Output is correct |
| 32 |
Correct |
3 ms |
1660 KB |
Output is correct |
| 33 |
Correct |
4 ms |
1660 KB |
Output is correct |
| 34 |
Correct |
5 ms |
1660 KB |
Output is correct |
| 35 |
Correct |
23 ms |
1916 KB |
Output is correct |
| 36 |
Correct |
7 ms |
1916 KB |
Output is correct |
| 37 |
Correct |
17 ms |
1916 KB |
Output is correct |
| 38 |
Correct |
38 ms |
2104 KB |
Output is correct |
| 39 |
Correct |
23 ms |
2104 KB |
Output is correct |
| 40 |
Correct |
25 ms |
2104 KB |
Output is correct |
| 41 |
Correct |
32 ms |
2108 KB |
Output is correct |
| 42 |
Correct |
31 ms |
2108 KB |
Output is correct |
| 43 |
Correct |
99 ms |
2168 KB |
Output is correct |
| 44 |
Correct |
339 ms |
2260 KB |
Output is correct |
| 45 |
Correct |
26 ms |
2260 KB |
Output is correct |
| 46 |
Correct |
29 ms |
2260 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
2260 KB |
Output is correct |
| 2 |
Correct |
3 ms |
2260 KB |
Output is correct |
| 3 |
Correct |
2 ms |
2260 KB |
Output is correct |
| 4 |
Correct |
3 ms |
2260 KB |
Output is correct |
| 5 |
Correct |
3 ms |
2260 KB |
Output is correct |
| 6 |
Correct |
3 ms |
2260 KB |
Output is correct |
| 7 |
Correct |
3 ms |
2260 KB |
Output is correct |
| 8 |
Correct |
3 ms |
2260 KB |
Output is correct |
| 9 |
Correct |
4 ms |
2260 KB |
Output is correct |
| 10 |
Correct |
4 ms |
2260 KB |
Output is correct |
| 11 |
Correct |
5 ms |
2260 KB |
Output is correct |
| 12 |
Correct |
4 ms |
2260 KB |
Output is correct |
| 13 |
Correct |
5 ms |
2260 KB |
Output is correct |
| 14 |
Correct |
5 ms |
2260 KB |
Output is correct |
| 15 |
Correct |
6 ms |
2260 KB |
Output is correct |
| 16 |
Correct |
3 ms |
2260 KB |
Output is correct |
| 17 |
Correct |
5 ms |
2260 KB |
Output is correct |
| 18 |
Correct |
3 ms |
2260 KB |
Output is correct |
| 19 |
Correct |
4 ms |
2260 KB |
Output is correct |
| 20 |
Correct |
276 ms |
2260 KB |
Output is correct |
| 21 |
Correct |
3 ms |
2260 KB |
Output is correct |
| 22 |
Correct |
4 ms |
2260 KB |
Output is correct |
| 23 |
Correct |
5 ms |
2260 KB |
Output is correct |
| 24 |
Correct |
6 ms |
2260 KB |
Output is correct |
| 25 |
Correct |
6 ms |
2260 KB |
Output is correct |
| 26 |
Correct |
6 ms |
2260 KB |
Output is correct |
| 27 |
Correct |
10 ms |
2260 KB |
Output is correct |
| 28 |
Correct |
5 ms |
2260 KB |
Output is correct |
| 29 |
Correct |
4 ms |
2260 KB |
Output is correct |
| 30 |
Correct |
4 ms |
2260 KB |
Output is correct |
| 31 |
Correct |
4 ms |
2260 KB |
Output is correct |
| 32 |
Correct |
5 ms |
2260 KB |
Output is correct |
| 33 |
Correct |
5 ms |
2260 KB |
Output is correct |
| 34 |
Correct |
5 ms |
2260 KB |
Output is correct |
| 35 |
Correct |
25 ms |
2260 KB |
Output is correct |
| 36 |
Correct |
7 ms |
2260 KB |
Output is correct |
| 37 |
Correct |
28 ms |
2260 KB |
Output is correct |
| 38 |
Correct |
30 ms |
2260 KB |
Output is correct |
| 39 |
Correct |
26 ms |
2260 KB |
Output is correct |
| 40 |
Correct |
25 ms |
2260 KB |
Output is correct |
| 41 |
Correct |
39 ms |
2260 KB |
Output is correct |
| 42 |
Correct |
23 ms |
2260 KB |
Output is correct |
| 43 |
Correct |
97 ms |
2260 KB |
Output is correct |
| 44 |
Correct |
359 ms |
2264 KB |
Output is correct |
| 45 |
Correct |
24 ms |
2264 KB |
Output is correct |
| 46 |
Correct |
22 ms |
2264 KB |
Output is correct |
| 47 |
Correct |
39 ms |
2264 KB |
Output is correct |
| 48 |
Correct |
27 ms |
2264 KB |
Output is correct |
| 49 |
Correct |
33 ms |
2264 KB |
Output is correct |
| 50 |
Correct |
17 ms |
2264 KB |
Output is correct |
| 51 |
Correct |
45 ms |
2300 KB |
Output is correct |
| 52 |
Correct |
52 ms |
2416 KB |
Output is correct |
| 53 |
Correct |
34 ms |
2416 KB |
Output is correct |
| 54 |
Correct |
3 ms |
2416 KB |
Output is correct |
| 55 |
Correct |
4 ms |
2416 KB |
Output is correct |
| 56 |
Execution timed out |
1085 ms |
2548 KB |
Time limit exceeded |
| 57 |
Halted |
0 ms |
0 KB |
- |
