#include <bits/stdc++.h>
#define ll int
#define ld long double
#define pb push_back
#define endl "\n"
#define fr first
#define sc second
#define sz size()
#define bc back()
using namespace std;
const ll N=2e3+7;
ll n,d[N];
vector <vector <pair<ll,ll>> > g(N);
void dijkstra(ll val){
set <pair<ll,ll>> q;
q.insert({0,val});
d[val]=0;
while(!q.empty()){
ll x=q.begin()->sc;
q.erase(q.begin());
for(auto i : g[x]){
ll len=i.sc,to=i.fr;
if(d[to]>d[x]+len){
q.erase({d[to], to});
d[to]=d[x]+len;
q.insert({d[to],to});
}
}
}
}
void solve(){
ll i,j,q,b,c,m,t;
ll k;
cin>>n>>m;
for(i=0;i<m;i++){
cin>>b>>t;
if(i==0) k=b;
if(i==1) q=b;
c=0;
for(j=b+t;j<n;j+=t){
c++;
g[b].pb({j,c});
}
c=0;
for(j=b-t;j>=0;j-=t){
c++;
g[b].pb({j,c});
}
}
for(i=0;i<n;i++) d[i]=INT_MAX;
dijkstra(k);
if(d[q]==INT_MAX) cout<<-1<<endl;
else cout<<d[q]<<endl;
}
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
ll t=1;
while(t--) solve();
}
/*
5 3
0 2
1 1
4 1
*/
Compilation message
skyscraper.cpp: In function 'void solve()':
skyscraper.cpp:51:13: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
51 | dijkstra(k);
| ~~~~~~~~^~~
skyscraper.cpp:52:11: warning: 'q' may be used uninitialized in this function [-Wmaybe-uninitialized]
52 | if(d[q]==INT_MAX) cout<<-1<<endl;
| ~~~^
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
340 KB |
Output is correct |
2 |
Correct |
0 ms |
340 KB |
Output is correct |
3 |
Correct |
1 ms |
340 KB |
Output is correct |
4 |
Correct |
0 ms |
340 KB |
Output is correct |
5 |
Correct |
0 ms |
340 KB |
Output is correct |
6 |
Correct |
0 ms |
340 KB |
Output is correct |
7 |
Correct |
0 ms |
340 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
340 KB |
Output is correct |
2 |
Correct |
0 ms |
340 KB |
Output is correct |
3 |
Correct |
0 ms |
340 KB |
Output is correct |
4 |
Correct |
1 ms |
340 KB |
Output is correct |
5 |
Correct |
0 ms |
340 KB |
Output is correct |
6 |
Correct |
1 ms |
340 KB |
Output is correct |
7 |
Correct |
0 ms |
340 KB |
Output is correct |
8 |
Correct |
0 ms |
340 KB |
Output is correct |
9 |
Correct |
0 ms |
340 KB |
Output is correct |
10 |
Correct |
1 ms |
340 KB |
Output is correct |
11 |
Correct |
1 ms |
468 KB |
Output is correct |
12 |
Correct |
4 ms |
2504 KB |
Output is correct |
13 |
Correct |
5 ms |
2504 KB |
Output is correct |
14 |
Correct |
1 ms |
340 KB |
Output is correct |
15 |
Correct |
1 ms |
340 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
340 KB |
Output is correct |
2 |
Correct |
0 ms |
340 KB |
Output is correct |
3 |
Correct |
0 ms |
340 KB |
Output is correct |
4 |
Correct |
0 ms |
340 KB |
Output is correct |
5 |
Correct |
1 ms |
340 KB |
Output is correct |
6 |
Correct |
0 ms |
340 KB |
Output is correct |
7 |
Correct |
0 ms |
340 KB |
Output is correct |
8 |
Correct |
1 ms |
340 KB |
Output is correct |
9 |
Correct |
0 ms |
340 KB |
Output is correct |
10 |
Correct |
1 ms |
340 KB |
Output is correct |
11 |
Correct |
1 ms |
468 KB |
Output is correct |
12 |
Correct |
4 ms |
2504 KB |
Output is correct |
13 |
Correct |
5 ms |
2504 KB |
Output is correct |
14 |
Correct |
1 ms |
340 KB |
Output is correct |
15 |
Correct |
1 ms |
340 KB |
Output is correct |
16 |
Correct |
1 ms |
340 KB |
Output is correct |
17 |
Correct |
2 ms |
596 KB |
Output is correct |
18 |
Correct |
1 ms |
340 KB |
Output is correct |
19 |
Correct |
1 ms |
340 KB |
Output is correct |
20 |
Correct |
58 ms |
32444 KB |
Output is correct |
21 |
Correct |
1 ms |
340 KB |
Output is correct |
22 |
Correct |
1 ms |
340 KB |
Output is correct |
23 |
Correct |
1 ms |
468 KB |
Output is correct |
24 |
Correct |
2 ms |
468 KB |
Output is correct |
25 |
Correct |
2 ms |
468 KB |
Output is correct |
26 |
Correct |
63 ms |
33408 KB |
Output is correct |
27 |
Correct |
60 ms |
33324 KB |
Output is correct |
28 |
Correct |
1 ms |
596 KB |
Output is correct |
29 |
Correct |
4 ms |
1108 KB |
Output is correct |
30 |
Correct |
2 ms |
596 KB |
Output is correct |
31 |
Correct |
3 ms |
724 KB |
Output is correct |
32 |
Correct |
2 ms |
596 KB |
Output is correct |
33 |
Correct |
6 ms |
1748 KB |
Output is correct |
34 |
Correct |
6 ms |
1620 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
340 KB |
Output is correct |
2 |
Correct |
0 ms |
340 KB |
Output is correct |
3 |
Correct |
0 ms |
340 KB |
Output is correct |
4 |
Correct |
0 ms |
340 KB |
Output is correct |
5 |
Correct |
0 ms |
340 KB |
Output is correct |
6 |
Correct |
0 ms |
340 KB |
Output is correct |
7 |
Correct |
1 ms |
340 KB |
Output is correct |
8 |
Correct |
1 ms |
340 KB |
Output is correct |
9 |
Correct |
0 ms |
340 KB |
Output is correct |
10 |
Correct |
1 ms |
340 KB |
Output is correct |
11 |
Correct |
1 ms |
468 KB |
Output is correct |
12 |
Correct |
5 ms |
2504 KB |
Output is correct |
13 |
Correct |
4 ms |
2504 KB |
Output is correct |
14 |
Correct |
1 ms |
340 KB |
Output is correct |
15 |
Correct |
1 ms |
340 KB |
Output is correct |
16 |
Correct |
1 ms |
340 KB |
Output is correct |
17 |
Correct |
2 ms |
596 KB |
Output is correct |
18 |
Correct |
1 ms |
340 KB |
Output is correct |
19 |
Correct |
1 ms |
340 KB |
Output is correct |
20 |
Correct |
60 ms |
32520 KB |
Output is correct |
21 |
Correct |
1 ms |
340 KB |
Output is correct |
22 |
Correct |
1 ms |
340 KB |
Output is correct |
23 |
Correct |
1 ms |
468 KB |
Output is correct |
24 |
Correct |
2 ms |
468 KB |
Output is correct |
25 |
Correct |
2 ms |
468 KB |
Output is correct |
26 |
Correct |
61 ms |
33436 KB |
Output is correct |
27 |
Correct |
60 ms |
33280 KB |
Output is correct |
28 |
Correct |
1 ms |
576 KB |
Output is correct |
29 |
Correct |
4 ms |
1108 KB |
Output is correct |
30 |
Correct |
2 ms |
596 KB |
Output is correct |
31 |
Correct |
3 ms |
724 KB |
Output is correct |
32 |
Correct |
3 ms |
596 KB |
Output is correct |
33 |
Correct |
5 ms |
1748 KB |
Output is correct |
34 |
Correct |
5 ms |
1620 KB |
Output is correct |
35 |
Correct |
7 ms |
1876 KB |
Output is correct |
36 |
Correct |
2 ms |
596 KB |
Output is correct |
37 |
Correct |
10 ms |
3540 KB |
Output is correct |
38 |
Correct |
10 ms |
2844 KB |
Output is correct |
39 |
Correct |
11 ms |
3028 KB |
Output is correct |
40 |
Correct |
10 ms |
2900 KB |
Output is correct |
41 |
Correct |
10 ms |
2812 KB |
Output is correct |
42 |
Runtime error |
291 ms |
262144 KB |
Execution killed with signal 9 |
43 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
340 KB |
Output is correct |
2 |
Correct |
0 ms |
340 KB |
Output is correct |
3 |
Correct |
1 ms |
340 KB |
Output is correct |
4 |
Correct |
1 ms |
340 KB |
Output is correct |
5 |
Correct |
1 ms |
340 KB |
Output is correct |
6 |
Correct |
0 ms |
340 KB |
Output is correct |
7 |
Correct |
0 ms |
340 KB |
Output is correct |
8 |
Correct |
0 ms |
340 KB |
Output is correct |
9 |
Correct |
1 ms |
340 KB |
Output is correct |
10 |
Correct |
0 ms |
340 KB |
Output is correct |
11 |
Correct |
1 ms |
468 KB |
Output is correct |
12 |
Correct |
4 ms |
2504 KB |
Output is correct |
13 |
Correct |
5 ms |
2504 KB |
Output is correct |
14 |
Correct |
1 ms |
340 KB |
Output is correct |
15 |
Correct |
1 ms |
340 KB |
Output is correct |
16 |
Correct |
1 ms |
340 KB |
Output is correct |
17 |
Correct |
2 ms |
596 KB |
Output is correct |
18 |
Correct |
1 ms |
340 KB |
Output is correct |
19 |
Correct |
1 ms |
340 KB |
Output is correct |
20 |
Correct |
58 ms |
32596 KB |
Output is correct |
21 |
Correct |
1 ms |
340 KB |
Output is correct |
22 |
Correct |
1 ms |
372 KB |
Output is correct |
23 |
Correct |
1 ms |
468 KB |
Output is correct |
24 |
Correct |
2 ms |
468 KB |
Output is correct |
25 |
Correct |
1 ms |
468 KB |
Output is correct |
26 |
Correct |
60 ms |
33464 KB |
Output is correct |
27 |
Correct |
61 ms |
33360 KB |
Output is correct |
28 |
Correct |
1 ms |
596 KB |
Output is correct |
29 |
Correct |
4 ms |
1108 KB |
Output is correct |
30 |
Correct |
2 ms |
596 KB |
Output is correct |
31 |
Correct |
3 ms |
724 KB |
Output is correct |
32 |
Correct |
2 ms |
596 KB |
Output is correct |
33 |
Correct |
5 ms |
1748 KB |
Output is correct |
34 |
Correct |
5 ms |
1620 KB |
Output is correct |
35 |
Correct |
7 ms |
1876 KB |
Output is correct |
36 |
Correct |
3 ms |
596 KB |
Output is correct |
37 |
Correct |
10 ms |
3540 KB |
Output is correct |
38 |
Correct |
11 ms |
2856 KB |
Output is correct |
39 |
Correct |
10 ms |
3036 KB |
Output is correct |
40 |
Correct |
10 ms |
2860 KB |
Output is correct |
41 |
Correct |
10 ms |
2772 KB |
Output is correct |
42 |
Runtime error |
291 ms |
262144 KB |
Execution killed with signal 9 |
43 |
Halted |
0 ms |
0 KB |
- |