#include<iostream>
#include<stdio.h>
#include<math.h>
#include<map>
#include<string>
#include<algorithm>
#include<vector>
#include<string.h>
#include<utility>
#include<set>
#include<cmath>
#include<queue>
#include<deque>
#include<functional>
#include<stack>
#include<limits.h>
#include<iomanip>
#include<unordered_map>
#include<numeric>
#include<tuple>
using namespace std;
#define MOD 1000000009
//#define int long long
#define ff first
#define ss second
#define endl '\n'
typedef pair<int,int> pp;
void solve(){
int n,m; cin>>n>>m;
int st,ed;
vector<int> v[n];
for(int i=0; i<m; i++){
int b,p; cin>>b>>p;
if(i==0) st=b;
if(i==1) ed=b;
v[b].push_back(p);
}
priority_queue<pp,vector<pp>,greater<pp> > q;
vector<int> dis(n,1e9);
q.push({0,st});
dis[st]=0;
while(!q.empty()){
int d=q.top().ff;
int c=q.top().ss;
q.pop();
if(d<=dis[c]){
for(auto p: v[c]){
for(int i=c,k=0; i<n; i+=p,k++){
if(d+k<dis[i]){
dis[i]=d+k;
q.push({d+k,i});
}
}
for(int i=c,k=0; i>=0; i-=p,k++){
if(d+k<dis[i]){
dis[i]=d+k;
q.push({d+k,i});
}
}
}
}
}
if(dis[ed]!=1e9) cout<<dis[ed];
else cout<<-1;
}
signed main(){
// freopen("248.in", "r", stdin);
// freopen("248.out", "w", stdout);
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int t=1;
// cin>>t;
while(t--){
solve();
cout<<endl;
}
return 0;
}
Compilation message
skyscraper.cpp: In function 'void solve()':
skyscraper.cpp:64:11: warning: 'ed' may be used uninitialized in this function [-Wmaybe-uninitialized]
64 | if(dis[ed]!=1e9) cout<<dis[ed];
| ^
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
1 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
1 ms |
348 KB |
Output is correct |
5 |
Correct |
1 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
1 ms |
348 KB |
Output is correct |
3 |
Correct |
1 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
1 ms |
348 KB |
Output is correct |
6 |
Correct |
1 ms |
348 KB |
Output is correct |
7 |
Correct |
1 ms |
348 KB |
Output is correct |
8 |
Correct |
1 ms |
344 KB |
Output is correct |
9 |
Correct |
1 ms |
452 KB |
Output is correct |
10 |
Correct |
1 ms |
348 KB |
Output is correct |
11 |
Correct |
1 ms |
348 KB |
Output is correct |
12 |
Correct |
1 ms |
348 KB |
Output is correct |
13 |
Correct |
1 ms |
348 KB |
Output is correct |
14 |
Correct |
1 ms |
348 KB |
Output is correct |
15 |
Correct |
1 ms |
348 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
1 ms |
348 KB |
Output is correct |
3 |
Correct |
1 ms |
348 KB |
Output is correct |
4 |
Correct |
1 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
344 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
404 KB |
Output is correct |
8 |
Correct |
1 ms |
348 KB |
Output is correct |
9 |
Correct |
1 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
1 ms |
344 KB |
Output is correct |
12 |
Correct |
1 ms |
500 KB |
Output is correct |
13 |
Correct |
1 ms |
348 KB |
Output is correct |
14 |
Correct |
1 ms |
348 KB |
Output is correct |
15 |
Correct |
1 ms |
348 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
1 ms |
344 KB |
Output is correct |
18 |
Correct |
1 ms |
344 KB |
Output is correct |
19 |
Correct |
1 ms |
348 KB |
Output is correct |
20 |
Correct |
4 ms |
604 KB |
Output is correct |
21 |
Correct |
1 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
348 KB |
Output is correct |
23 |
Correct |
1 ms |
348 KB |
Output is correct |
24 |
Correct |
1 ms |
348 KB |
Output is correct |
25 |
Correct |
1 ms |
604 KB |
Output is correct |
26 |
Correct |
6 ms |
552 KB |
Output is correct |
27 |
Correct |
4 ms |
348 KB |
Output is correct |
28 |
Correct |
1 ms |
348 KB |
Output is correct |
29 |
Correct |
2 ms |
604 KB |
Output is correct |
30 |
Correct |
1 ms |
604 KB |
Output is correct |
31 |
Correct |
1 ms |
604 KB |
Output is correct |
32 |
Correct |
1 ms |
604 KB |
Output is correct |
33 |
Correct |
2 ms |
604 KB |
Output is correct |
34 |
Correct |
2 ms |
600 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
1 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
1 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
1 ms |
348 KB |
Output is correct |
11 |
Correct |
1 ms |
348 KB |
Output is correct |
12 |
Correct |
1 ms |
460 KB |
Output is correct |
13 |
Correct |
1 ms |
484 KB |
Output is correct |
14 |
Correct |
1 ms |
348 KB |
Output is correct |
15 |
Correct |
1 ms |
348 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
1 ms |
348 KB |
Output is correct |
18 |
Correct |
1 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
456 KB |
Output is correct |
20 |
Correct |
3 ms |
604 KB |
Output is correct |
21 |
Correct |
1 ms |
348 KB |
Output is correct |
22 |
Correct |
1 ms |
500 KB |
Output is correct |
23 |
Correct |
1 ms |
348 KB |
Output is correct |
24 |
Correct |
1 ms |
348 KB |
Output is correct |
25 |
Correct |
2 ms |
604 KB |
Output is correct |
26 |
Correct |
4 ms |
348 KB |
Output is correct |
27 |
Correct |
3 ms |
348 KB |
Output is correct |
28 |
Correct |
1 ms |
348 KB |
Output is correct |
29 |
Correct |
2 ms |
604 KB |
Output is correct |
30 |
Correct |
1 ms |
604 KB |
Output is correct |
31 |
Correct |
1 ms |
604 KB |
Output is correct |
32 |
Correct |
1 ms |
604 KB |
Output is correct |
33 |
Correct |
2 ms |
604 KB |
Output is correct |
34 |
Correct |
2 ms |
604 KB |
Output is correct |
35 |
Correct |
5 ms |
860 KB |
Output is correct |
36 |
Correct |
2 ms |
604 KB |
Output is correct |
37 |
Correct |
5 ms |
860 KB |
Output is correct |
38 |
Correct |
9 ms |
1116 KB |
Output is correct |
39 |
Correct |
6 ms |
860 KB |
Output is correct |
40 |
Correct |
6 ms |
976 KB |
Output is correct |
41 |
Correct |
6 ms |
976 KB |
Output is correct |
42 |
Correct |
41 ms |
860 KB |
Output is correct |
43 |
Correct |
41 ms |
860 KB |
Output is correct |
44 |
Correct |
46 ms |
908 KB |
Output is correct |
45 |
Correct |
6 ms |
1116 KB |
Output is correct |
46 |
Correct |
6 ms |
1112 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
344 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
1 ms |
348 KB |
Output is correct |
4 |
Correct |
1 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
352 KB |
Output is correct |
6 |
Correct |
0 ms |
460 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
1 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
1 ms |
352 KB |
Output is correct |
11 |
Correct |
1 ms |
604 KB |
Output is correct |
12 |
Correct |
1 ms |
348 KB |
Output is correct |
13 |
Correct |
1 ms |
348 KB |
Output is correct |
14 |
Correct |
1 ms |
348 KB |
Output is correct |
15 |
Correct |
1 ms |
352 KB |
Output is correct |
16 |
Correct |
0 ms |
352 KB |
Output is correct |
17 |
Correct |
1 ms |
352 KB |
Output is correct |
18 |
Correct |
1 ms |
360 KB |
Output is correct |
19 |
Correct |
0 ms |
344 KB |
Output is correct |
20 |
Correct |
3 ms |
600 KB |
Output is correct |
21 |
Correct |
1 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
460 KB |
Output is correct |
23 |
Correct |
2 ms |
348 KB |
Output is correct |
24 |
Correct |
1 ms |
600 KB |
Output is correct |
25 |
Correct |
1 ms |
604 KB |
Output is correct |
26 |
Correct |
4 ms |
344 KB |
Output is correct |
27 |
Correct |
3 ms |
348 KB |
Output is correct |
28 |
Correct |
1 ms |
348 KB |
Output is correct |
29 |
Correct |
2 ms |
656 KB |
Output is correct |
30 |
Correct |
1 ms |
456 KB |
Output is correct |
31 |
Correct |
1 ms |
600 KB |
Output is correct |
32 |
Correct |
1 ms |
604 KB |
Output is correct |
33 |
Correct |
2 ms |
604 KB |
Output is correct |
34 |
Correct |
3 ms |
604 KB |
Output is correct |
35 |
Correct |
4 ms |
860 KB |
Output is correct |
36 |
Correct |
1 ms |
604 KB |
Output is correct |
37 |
Correct |
4 ms |
860 KB |
Output is correct |
38 |
Correct |
6 ms |
1088 KB |
Output is correct |
39 |
Correct |
6 ms |
860 KB |
Output is correct |
40 |
Correct |
5 ms |
1116 KB |
Output is correct |
41 |
Correct |
6 ms |
976 KB |
Output is correct |
42 |
Correct |
41 ms |
856 KB |
Output is correct |
43 |
Correct |
40 ms |
860 KB |
Output is correct |
44 |
Correct |
43 ms |
928 KB |
Output is correct |
45 |
Correct |
5 ms |
1116 KB |
Output is correct |
46 |
Correct |
5 ms |
1116 KB |
Output is correct |
47 |
Correct |
12 ms |
2008 KB |
Output is correct |
48 |
Correct |
4 ms |
1628 KB |
Output is correct |
49 |
Correct |
5 ms |
1668 KB |
Output is correct |
50 |
Correct |
3 ms |
1628 KB |
Output is correct |
51 |
Correct |
19 ms |
3224 KB |
Output is correct |
52 |
Correct |
18 ms |
2776 KB |
Output is correct |
53 |
Correct |
10 ms |
2776 KB |
Output is correct |
54 |
Correct |
2 ms |
1372 KB |
Output is correct |
55 |
Correct |
2 ms |
1620 KB |
Output is correct |
56 |
Correct |
548 ms |
2772 KB |
Output is correct |
57 |
Correct |
34 ms |
3536 KB |
Output is correct |
58 |
Correct |
530 ms |
1628 KB |
Output is correct |
59 |
Correct |
561 ms |
1880 KB |
Output is correct |
60 |
Correct |
560 ms |
1880 KB |
Output is correct |
61 |
Correct |
526 ms |
1884 KB |
Output is correct |
62 |
Correct |
7 ms |
2340 KB |
Output is correct |
63 |
Correct |
25 ms |
2772 KB |
Output is correct |
64 |
Correct |
24 ms |
4044 KB |
Output is correct |
65 |
Correct |
29 ms |
3792 KB |
Output is correct |
66 |
Correct |
44 ms |
3792 KB |
Output is correct |
67 |
Correct |
43 ms |
3792 KB |
Output is correct |