#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define endl '\n'
void solve(){
int n,m;
cin>>n>>m;
vector<vector<int>> adj(n+1);
vector<pair<int,int>> v(m);
int pos = 0;
for(int i=0;i<m;i++){
int a,b;cin>>a>>b;
v[i].first = a;
v[i].second = b;
if(i == 1) pos = a;
adj[a].push_back(i);
}
queue<array<int,2>> q;
vector<vector<bool>> vis(n,vector<bool>(m));
q.push({v[0].first,0});
vector<vector<int>> dis(n,vector<int>(m,0));
while(q.size()){
array<int,2> cur = q.front(); q.pop();
for(auto ch : adj[cur[0]]){
int p = v[ch].second;
if(cur[0]+p<n && !vis[cur[0]+p][ch]){
q.push({cur[0]+p,ch});
dis[cur[0]+p][ch] = dis[cur[0]][cur[1]] + 1;
vis[cur[0]+p][ch] = 1;
}
if(cur[0]-p>=0 && !vis[cur[0]-p][ch]){
q.push({cur[0]-p,ch});
dis[cur[0]-p][ch] = dis[cur[0]][cur[1]] + 1;
vis[cur[0]-p][ch] = 1;
}
}
int p = v[cur[1]].second;
if(cur[0]+p<n && !vis[cur[0]+p][cur[1]]){
q.push({cur[0]+p,cur[1]});
dis[cur[0]+p][cur[1]] = dis[cur[0]][cur[1]] + 1;
vis[cur[0]+p][cur[1]] = 1;
}
if(cur[0]-p>=0 && !vis[cur[0]-p][cur[1]]){
q.push({cur[0]-p,cur[1]});
dis[cur[0]-p][cur[1]] = dis[cur[0]][cur[1]] + 1;
vis[cur[0]-p][cur[1]] = 1;
}
}
if(v[0].first == v[1].first){
cout<<0<<endl;
}
else {
int ans = 1e9;
for(int i=0;i<m;i++){
if(i == 1) continue;
if(dis[v[1].first][i] == 0) continue;
ans = min(ans,dis[v[1].first][i]);
}
cout<<(ans==1e9?-1:ans)<<endl;
}
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int t=1;
// cin>>t;
while(t--){
solve();
}
return 0;
}
Compilation message
skyscraper.cpp: In function 'void solve()':
skyscraper.cpp:11:9: warning: variable 'pos' set but not used [-Wunused-but-set-variable]
11 | int pos = 0;
| ^~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
0 ms |
212 KB |
Output is correct |
6 |
Correct |
0 ms |
212 KB |
Output is correct |
7 |
Correct |
0 ms |
212 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
1 ms |
212 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
1 ms |
256 KB |
Output is correct |
5 |
Correct |
0 ms |
212 KB |
Output is correct |
6 |
Correct |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
0 ms |
212 KB |
Output is correct |
8 |
Correct |
0 ms |
212 KB |
Output is correct |
9 |
Correct |
0 ms |
212 KB |
Output is correct |
10 |
Correct |
1 ms |
468 KB |
Output is correct |
11 |
Correct |
3 ms |
1108 KB |
Output is correct |
12 |
Correct |
26 ms |
1212 KB |
Output is correct |
13 |
Correct |
23 ms |
1196 KB |
Output is correct |
14 |
Correct |
1 ms |
1108 KB |
Output is correct |
15 |
Correct |
2 ms |
1108 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
1 ms |
212 KB |
Output is correct |
6 |
Correct |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
0 ms |
212 KB |
Output is correct |
8 |
Correct |
0 ms |
212 KB |
Output is correct |
9 |
Correct |
0 ms |
212 KB |
Output is correct |
10 |
Correct |
1 ms |
468 KB |
Output is correct |
11 |
Correct |
2 ms |
1108 KB |
Output is correct |
12 |
Correct |
23 ms |
1108 KB |
Output is correct |
13 |
Correct |
34 ms |
1180 KB |
Output is correct |
14 |
Correct |
2 ms |
1108 KB |
Output is correct |
15 |
Correct |
1 ms |
1108 KB |
Output is correct |
16 |
Correct |
1 ms |
980 KB |
Output is correct |
17 |
Correct |
5 ms |
5756 KB |
Output is correct |
18 |
Correct |
4 ms |
7508 KB |
Output is correct |
19 |
Correct |
3 ms |
4948 KB |
Output is correct |
20 |
Correct |
229 ms |
16800 KB |
Output is correct |
21 |
Correct |
2 ms |
2132 KB |
Output is correct |
22 |
Correct |
3 ms |
5716 KB |
Output is correct |
23 |
Correct |
4 ms |
6740 KB |
Output is correct |
24 |
Correct |
8 ms |
15060 KB |
Output is correct |
25 |
Correct |
9 ms |
16724 KB |
Output is correct |
26 |
Correct |
97 ms |
16776 KB |
Output is correct |
27 |
Correct |
91 ms |
16764 KB |
Output is correct |
28 |
Correct |
9 ms |
16680 KB |
Output is correct |
29 |
Correct |
7 ms |
6484 KB |
Output is correct |
30 |
Correct |
2 ms |
1876 KB |
Output is correct |
31 |
Correct |
4 ms |
5204 KB |
Output is correct |
32 |
Correct |
3 ms |
4436 KB |
Output is correct |
33 |
Correct |
14 ms |
16724 KB |
Output is correct |
34 |
Correct |
16 ms |
16780 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
0 ms |
212 KB |
Output is correct |
6 |
Correct |
0 ms |
212 KB |
Output is correct |
7 |
Correct |
0 ms |
212 KB |
Output is correct |
8 |
Correct |
1 ms |
212 KB |
Output is correct |
9 |
Correct |
1 ms |
212 KB |
Output is correct |
10 |
Correct |
1 ms |
468 KB |
Output is correct |
11 |
Correct |
2 ms |
1108 KB |
Output is correct |
12 |
Correct |
24 ms |
1212 KB |
Output is correct |
13 |
Correct |
23 ms |
1108 KB |
Output is correct |
14 |
Correct |
3 ms |
1108 KB |
Output is correct |
15 |
Correct |
2 ms |
1108 KB |
Output is correct |
16 |
Correct |
1 ms |
980 KB |
Output is correct |
17 |
Correct |
6 ms |
5756 KB |
Output is correct |
18 |
Correct |
4 ms |
7508 KB |
Output is correct |
19 |
Correct |
3 ms |
4948 KB |
Output is correct |
20 |
Correct |
219 ms |
16848 KB |
Output is correct |
21 |
Correct |
1 ms |
2132 KB |
Output is correct |
22 |
Correct |
3 ms |
5716 KB |
Output is correct |
23 |
Correct |
4 ms |
6688 KB |
Output is correct |
24 |
Correct |
8 ms |
15060 KB |
Output is correct |
25 |
Correct |
9 ms |
16724 KB |
Output is correct |
26 |
Correct |
91 ms |
16768 KB |
Output is correct |
27 |
Correct |
84 ms |
16724 KB |
Output is correct |
28 |
Correct |
9 ms |
16724 KB |
Output is correct |
29 |
Correct |
6 ms |
6484 KB |
Output is correct |
30 |
Correct |
2 ms |
1876 KB |
Output is correct |
31 |
Correct |
5 ms |
5204 KB |
Output is correct |
32 |
Correct |
3 ms |
4436 KB |
Output is correct |
33 |
Correct |
14 ms |
16776 KB |
Output is correct |
34 |
Correct |
20 ms |
16724 KB |
Output is correct |
35 |
Correct |
102 ms |
149972 KB |
Output is correct |
36 |
Correct |
12 ms |
21332 KB |
Output is correct |
37 |
Correct |
122 ms |
152596 KB |
Output is correct |
38 |
Correct |
163 ms |
242952 KB |
Output is correct |
39 |
Correct |
164 ms |
243436 KB |
Output is correct |
40 |
Correct |
193 ms |
243468 KB |
Output is correct |
41 |
Correct |
173 ms |
243252 KB |
Output is correct |
42 |
Execution timed out |
1089 ms |
243932 KB |
Time limit exceeded |
43 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
0 ms |
212 KB |
Output is correct |
6 |
Correct |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
1 ms |
212 KB |
Output is correct |
8 |
Correct |
0 ms |
212 KB |
Output is correct |
9 |
Correct |
1 ms |
340 KB |
Output is correct |
10 |
Correct |
1 ms |
468 KB |
Output is correct |
11 |
Correct |
2 ms |
1108 KB |
Output is correct |
12 |
Correct |
23 ms |
1108 KB |
Output is correct |
13 |
Correct |
22 ms |
1212 KB |
Output is correct |
14 |
Correct |
1 ms |
1108 KB |
Output is correct |
15 |
Correct |
1 ms |
1108 KB |
Output is correct |
16 |
Correct |
1 ms |
980 KB |
Output is correct |
17 |
Correct |
5 ms |
5716 KB |
Output is correct |
18 |
Correct |
4 ms |
7508 KB |
Output is correct |
19 |
Correct |
3 ms |
4940 KB |
Output is correct |
20 |
Correct |
199 ms |
16796 KB |
Output is correct |
21 |
Correct |
1 ms |
2132 KB |
Output is correct |
22 |
Correct |
3 ms |
5716 KB |
Output is correct |
23 |
Correct |
4 ms |
6740 KB |
Output is correct |
24 |
Correct |
8 ms |
15060 KB |
Output is correct |
25 |
Correct |
9 ms |
16724 KB |
Output is correct |
26 |
Correct |
92 ms |
16780 KB |
Output is correct |
27 |
Correct |
85 ms |
16760 KB |
Output is correct |
28 |
Correct |
10 ms |
16724 KB |
Output is correct |
29 |
Correct |
6 ms |
6588 KB |
Output is correct |
30 |
Correct |
2 ms |
1876 KB |
Output is correct |
31 |
Correct |
4 ms |
5204 KB |
Output is correct |
32 |
Correct |
3 ms |
4436 KB |
Output is correct |
33 |
Correct |
14 ms |
16724 KB |
Output is correct |
34 |
Correct |
14 ms |
16772 KB |
Output is correct |
35 |
Correct |
98 ms |
149952 KB |
Output is correct |
36 |
Correct |
12 ms |
21332 KB |
Output is correct |
37 |
Correct |
125 ms |
152608 KB |
Output is correct |
38 |
Correct |
179 ms |
243068 KB |
Output is correct |
39 |
Correct |
168 ms |
243456 KB |
Output is correct |
40 |
Correct |
181 ms |
243372 KB |
Output is correct |
41 |
Correct |
171 ms |
243276 KB |
Output is correct |
42 |
Execution timed out |
1106 ms |
243808 KB |
Time limit exceeded |
43 |
Halted |
0 ms |
0 KB |
- |