#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for (int i=a; i<int(b); i++)
#define all(x) x.begin(),x.end()
int main() {
int n,m;
cin >> n >> m;
vector<pair<int,int> > doges(m);
vector<set<int> > scrapers(n); //For each scraper a set of all dogs that reside there from beginning, or rather their jumps
rep(i,0,m) {
int b,p;
cin >> b >> p;
doges[i]=make_pair(b,abs(p));
scrapers[b].insert(-p);
}
queue<vector<int> > order; //Each element is <numjumps,position, jumplen, 1 or 0 for left/right>
int dp[n];
rep (i,0,n) dp[i]=1000000000;
int start,stop;
start=doges[0].first;
stop=doges[1].first;
dp[start]=0;
for (auto p:scrapers[start]) {
order.push({0,start,-p,1});
order.push({0,start,-p,0});
}
while (!order.empty()) {
int num,pos,p;
num=-order.front()[0];
pos=order.front()[1];
p=order.front()[2];
bool left = order.front()[3]==1;
order.pop();
int next;
if (left) next=pos+p;
else next=pos-p;
if (next>=0 && next<n) {
if (next==stop) {dp[next]=min(num+1,dp[next]); break;}
if (dp[next]>num+1) {
dp[next]=num+1;
for (auto pn:scrapers[next]){
if (-pn!=p) {
order.push({-num-1,next,-pn,1});
order.push({-num-1,next,-pn,0});
}
}
}
order.push({-num-1,next,p,left});
}
}
if (dp[stop] == 1000000000) cout << -1 << endl;
else cout << dp[stop]<< endl;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
248 KB |
Output is correct |
| 2 |
Correct |
3 ms |
356 KB |
Output is correct |
| 3 |
Correct |
3 ms |
356 KB |
Output is correct |
| 4 |
Correct |
3 ms |
392 KB |
Output is correct |
| 5 |
Correct |
3 ms |
440 KB |
Output is correct |
| 6 |
Correct |
3 ms |
440 KB |
Output is correct |
| 7 |
Correct |
3 ms |
516 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
516 KB |
Output is correct |
| 2 |
Correct |
3 ms |
600 KB |
Output is correct |
| 3 |
Correct |
2 ms |
600 KB |
Output is correct |
| 4 |
Correct |
2 ms |
600 KB |
Output is correct |
| 5 |
Correct |
3 ms |
612 KB |
Output is correct |
| 6 |
Correct |
3 ms |
612 KB |
Output is correct |
| 7 |
Correct |
3 ms |
612 KB |
Output is correct |
| 8 |
Correct |
3 ms |
612 KB |
Output is correct |
| 9 |
Correct |
2 ms |
612 KB |
Output is correct |
| 10 |
Correct |
3 ms |
612 KB |
Output is correct |
| 11 |
Correct |
4 ms |
612 KB |
Output is correct |
| 12 |
Correct |
4 ms |
612 KB |
Output is correct |
| 13 |
Correct |
4 ms |
612 KB |
Output is correct |
| 14 |
Correct |
5 ms |
868 KB |
Output is correct |
| 15 |
Correct |
4 ms |
868 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
868 KB |
Output is correct |
| 2 |
Correct |
2 ms |
868 KB |
Output is correct |
| 3 |
Correct |
2 ms |
868 KB |
Output is correct |
| 4 |
Correct |
2 ms |
868 KB |
Output is correct |
| 5 |
Correct |
3 ms |
868 KB |
Output is correct |
| 6 |
Correct |
3 ms |
868 KB |
Output is correct |
| 7 |
Correct |
2 ms |
868 KB |
Output is correct |
| 8 |
Correct |
2 ms |
868 KB |
Output is correct |
| 9 |
Correct |
2 ms |
868 KB |
Output is correct |
| 10 |
Correct |
4 ms |
868 KB |
Output is correct |
| 11 |
Correct |
5 ms |
868 KB |
Output is correct |
| 12 |
Correct |
3 ms |
868 KB |
Output is correct |
| 13 |
Correct |
4 ms |
868 KB |
Output is correct |
| 14 |
Correct |
6 ms |
984 KB |
Output is correct |
| 15 |
Correct |
6 ms |
984 KB |
Output is correct |
| 16 |
Correct |
4 ms |
984 KB |
Output is correct |
| 17 |
Correct |
5 ms |
984 KB |
Output is correct |
| 18 |
Correct |
4 ms |
984 KB |
Output is correct |
| 19 |
Correct |
4 ms |
984 KB |
Output is correct |
| 20 |
Correct |
5 ms |
984 KB |
Output is correct |
| 21 |
Correct |
4 ms |
984 KB |
Output is correct |
| 22 |
Correct |
3 ms |
984 KB |
Output is correct |
| 23 |
Correct |
4 ms |
984 KB |
Output is correct |
| 24 |
Correct |
4 ms |
984 KB |
Output is correct |
| 25 |
Correct |
6 ms |
984 KB |
Output is correct |
| 26 |
Correct |
5 ms |
984 KB |
Output is correct |
| 27 |
Correct |
5 ms |
984 KB |
Output is correct |
| 28 |
Correct |
5 ms |
984 KB |
Output is correct |
| 29 |
Correct |
7 ms |
984 KB |
Output is correct |
| 30 |
Correct |
4 ms |
984 KB |
Output is correct |
| 31 |
Correct |
5 ms |
984 KB |
Output is correct |
| 32 |
Correct |
4 ms |
984 KB |
Output is correct |
| 33 |
Correct |
14 ms |
996 KB |
Output is correct |
| 34 |
Correct |
8 ms |
1132 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
1132 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 11 |
Correct |
1 ms |
1132 KB |
Output is correct |
| 12 |
Correct |
5 ms |
1132 KB |
Output is correct |
| 13 |
Correct |
5 ms |
1132 KB |
Output is correct |
| 14 |
Correct |
6 ms |
1132 KB |
Output is correct |
| 15 |
Correct |
4 ms |
1132 KB |
Output is correct |
| 16 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 17 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 18 |
Correct |
6 ms |
1132 KB |
Output is correct |
| 19 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 20 |
Correct |
4 ms |
1132 KB |
Output is correct |
| 21 |
Correct |
4 ms |
1132 KB |
Output is correct |
| 22 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 23 |
Correct |
5 ms |
1132 KB |
Output is correct |
| 24 |
Correct |
5 ms |
1132 KB |
Output is correct |
| 25 |
Correct |
4 ms |
1132 KB |
Output is correct |
| 26 |
Correct |
4 ms |
1132 KB |
Output is correct |
| 27 |
Correct |
5 ms |
1132 KB |
Output is correct |
| 28 |
Correct |
8 ms |
1132 KB |
Output is correct |
| 29 |
Correct |
7 ms |
1132 KB |
Output is correct |
| 30 |
Correct |
4 ms |
1132 KB |
Output is correct |
| 31 |
Correct |
7 ms |
1132 KB |
Output is correct |
| 32 |
Correct |
5 ms |
1132 KB |
Output is correct |
| 33 |
Correct |
14 ms |
1132 KB |
Output is correct |
| 34 |
Correct |
9 ms |
1132 KB |
Output is correct |
| 35 |
Correct |
48 ms |
4348 KB |
Output is correct |
| 36 |
Correct |
7 ms |
4348 KB |
Output is correct |
| 37 |
Correct |
30 ms |
4348 KB |
Output is correct |
| 38 |
Correct |
72 ms |
4348 KB |
Output is correct |
| 39 |
Correct |
43 ms |
4348 KB |
Output is correct |
| 40 |
Correct |
42 ms |
4348 KB |
Output is correct |
| 41 |
Correct |
48 ms |
4860 KB |
Output is correct |
| 42 |
Correct |
21 ms |
4860 KB |
Output is correct |
| 43 |
Correct |
21 ms |
4860 KB |
Output is correct |
| 44 |
Correct |
21 ms |
4860 KB |
Output is correct |
| 45 |
Correct |
84 ms |
5628 KB |
Output is correct |
| 46 |
Correct |
74 ms |
5628 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
5628 KB |
Output is correct |
| 2 |
Correct |
2 ms |
5628 KB |
Output is correct |
| 3 |
Correct |
3 ms |
5628 KB |
Output is correct |
| 4 |
Correct |
2 ms |
5628 KB |
Output is correct |
| 5 |
Correct |
2 ms |
5628 KB |
Output is correct |
| 6 |
Correct |
2 ms |
5628 KB |
Output is correct |
| 7 |
Correct |
3 ms |
5628 KB |
Output is correct |
| 8 |
Correct |
3 ms |
5628 KB |
Output is correct |
| 9 |
Correct |
3 ms |
5628 KB |
Output is correct |
| 10 |
Correct |
4 ms |
5628 KB |
Output is correct |
| 11 |
Correct |
5 ms |
5628 KB |
Output is correct |
| 12 |
Correct |
3 ms |
5628 KB |
Output is correct |
| 13 |
Correct |
4 ms |
5628 KB |
Output is correct |
| 14 |
Correct |
6 ms |
5628 KB |
Output is correct |
| 15 |
Correct |
4 ms |
5628 KB |
Output is correct |
| 16 |
Correct |
3 ms |
5628 KB |
Output is correct |
| 17 |
Correct |
5 ms |
5628 KB |
Output is correct |
| 18 |
Correct |
5 ms |
5628 KB |
Output is correct |
| 19 |
Correct |
3 ms |
5628 KB |
Output is correct |
| 20 |
Correct |
4 ms |
5628 KB |
Output is correct |
| 21 |
Correct |
4 ms |
5628 KB |
Output is correct |
| 22 |
Correct |
3 ms |
5628 KB |
Output is correct |
| 23 |
Correct |
4 ms |
5628 KB |
Output is correct |
| 24 |
Correct |
8 ms |
5628 KB |
Output is correct |
| 25 |
Correct |
5 ms |
5628 KB |
Output is correct |
| 26 |
Correct |
6 ms |
5628 KB |
Output is correct |
| 27 |
Correct |
4 ms |
5628 KB |
Output is correct |
| 28 |
Correct |
6 ms |
5628 KB |
Output is correct |
| 29 |
Correct |
9 ms |
5628 KB |
Output is correct |
| 30 |
Correct |
4 ms |
5628 KB |
Output is correct |
| 31 |
Correct |
5 ms |
5628 KB |
Output is correct |
| 32 |
Correct |
4 ms |
5628 KB |
Output is correct |
| 33 |
Correct |
11 ms |
5628 KB |
Output is correct |
| 34 |
Correct |
12 ms |
5628 KB |
Output is correct |
| 35 |
Correct |
63 ms |
5628 KB |
Output is correct |
| 36 |
Correct |
6 ms |
5628 KB |
Output is correct |
| 37 |
Correct |
25 ms |
5628 KB |
Output is correct |
| 38 |
Correct |
63 ms |
5628 KB |
Output is correct |
| 39 |
Correct |
44 ms |
5628 KB |
Output is correct |
| 40 |
Correct |
47 ms |
5628 KB |
Output is correct |
| 41 |
Correct |
58 ms |
5628 KB |
Output is correct |
| 42 |
Correct |
21 ms |
5628 KB |
Output is correct |
| 43 |
Correct |
21 ms |
5628 KB |
Output is correct |
| 44 |
Correct |
20 ms |
5628 KB |
Output is correct |
| 45 |
Correct |
137 ms |
5760 KB |
Output is correct |
| 46 |
Correct |
64 ms |
5760 KB |
Output is correct |
| 47 |
Correct |
28 ms |
5760 KB |
Output is correct |
| 48 |
Correct |
27 ms |
5760 KB |
Output is correct |
| 49 |
Correct |
36 ms |
5760 KB |
Output is correct |
| 50 |
Correct |
22 ms |
5760 KB |
Output is correct |
| 51 |
Correct |
54 ms |
5760 KB |
Output is correct |
| 52 |
Correct |
74 ms |
5760 KB |
Output is correct |
| 53 |
Correct |
46 ms |
5760 KB |
Output is correct |
| 54 |
Correct |
5 ms |
5760 KB |
Output is correct |
| 55 |
Correct |
5 ms |
5760 KB |
Output is correct |
| 56 |
Correct |
33 ms |
5760 KB |
Output is correct |
| 57 |
Correct |
7 ms |
5760 KB |
Output is correct |
| 58 |
Correct |
21 ms |
5760 KB |
Output is correct |
| 59 |
Correct |
45 ms |
5760 KB |
Output is correct |
| 60 |
Correct |
26 ms |
5760 KB |
Output is correct |
| 61 |
Correct |
42 ms |
5760 KB |
Output is correct |
| 62 |
Correct |
67 ms |
5760 KB |
Output is correct |
| 63 |
Correct |
241 ms |
5760 KB |
Output is correct |
| 64 |
Correct |
276 ms |
5760 KB |
Output is correct |
| 65 |
Correct |
384 ms |
5760 KB |
Output is correct |
| 66 |
Correct |
664 ms |
7036 KB |
Output is correct |
| 67 |
Correct |
233 ms |
7212 KB |
Output is correct |
