#include <bits/stdc++.h>
using namespace std;
const int inf=2e3+9,M=3e4+9;
int n,m;
int building[M],speed[M],dis[inf][inf][2];//dis[building][speed]
bool vis[inf][inf][2];
vector<int> dogs[inf];
struct State{
int B,S;
bool Pass;
};
deque<State>q;
int main(){
scanf("%d%d",&n,&m);
for(int i=1;i<=m;i++)
scanf("%d%d",building+i,speed+i),building[i]++,dogs[building[i]].push_back(i);
memset(dis,21,sizeof(dis));
int goal=building[2];
dis[building[1]][speed[1]][0]=0;
q.push_front({building[1],speed[1],0});
while(!q.empty()){
State cur=q.front();
q.pop_front();
if(vis[cur.B][cur.S][cur.Pass])
continue;
vis[cur.B][cur.S][cur.Pass]=1;
if(cur.B==goal)
printf("%d\n",dis[cur.B][cur.S][cur.Pass]),exit(0);
if(!cur.Pass){
dis[cur.B][cur.S][1]=dis[cur.B][cur.S][0];
q.push_front({cur.B,cur.S,1});
for(auto o:dogs[cur.B])
if(dis[ building[o] ][ speed[o] ] [1] >= dis[ cur.B ] [ cur.S ] [cur.Pass] )
dis[ building[o] ][ speed[o] ] [1] = dis[ cur.B ] [ cur.S ] [cur.Pass],
q.push_front( {building[o],speed[o],1} );
continue;
}
if(cur.B+cur.S<=n && dis[ cur.B+cur.S ][ cur.S ][0]> dis[cur.B][cur.S][cur.Pass]+1 )
dis[ cur.B+cur.S ][ cur.S ][0] = dis[cur.B][cur.S][cur.Pass]+1,
q.push_back({cur.B+cur.S , cur.S , 0});
if(cur.B - cur.S >=1 && dis[cur.B-cur.S] [ cur.S ][0] > dis[cur.B] [cur.S] [cur.Pass]+1)
dis[cur.B-cur.S] [ cur.S ][0] = dis[cur.B] [cur.S] [cur.Pass]+1,
q.push_back({cur.B-cur.S , cur.S , 0});
}
printf("-1\n");
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&n,&m);
~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:19:55: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",building+i,speed+i),building[i]++,dogs[building[i]].push_back(i);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
25 ms |
32000 KB |
Output is correct |
2 |
Correct |
27 ms |
31992 KB |
Output is correct |
3 |
Correct |
23 ms |
31992 KB |
Output is correct |
4 |
Correct |
24 ms |
32000 KB |
Output is correct |
5 |
Correct |
24 ms |
32000 KB |
Output is correct |
6 |
Correct |
26 ms |
32120 KB |
Output is correct |
7 |
Correct |
26 ms |
32024 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
24 ms |
32000 KB |
Output is correct |
2 |
Correct |
23 ms |
32000 KB |
Output is correct |
3 |
Correct |
23 ms |
32000 KB |
Output is correct |
4 |
Correct |
27 ms |
31992 KB |
Output is correct |
5 |
Correct |
30 ms |
31992 KB |
Output is correct |
6 |
Correct |
24 ms |
31992 KB |
Output is correct |
7 |
Correct |
25 ms |
31992 KB |
Output is correct |
8 |
Correct |
23 ms |
31864 KB |
Output is correct |
9 |
Correct |
26 ms |
32120 KB |
Output is correct |
10 |
Correct |
24 ms |
32256 KB |
Output is correct |
11 |
Correct |
23 ms |
31992 KB |
Output is correct |
12 |
Correct |
24 ms |
32384 KB |
Output is correct |
13 |
Correct |
24 ms |
32384 KB |
Output is correct |
14 |
Correct |
25 ms |
32384 KB |
Output is correct |
15 |
Correct |
24 ms |
32376 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
23 ms |
32000 KB |
Output is correct |
2 |
Correct |
23 ms |
32036 KB |
Output is correct |
3 |
Correct |
23 ms |
31992 KB |
Output is correct |
4 |
Correct |
24 ms |
32000 KB |
Output is correct |
5 |
Correct |
24 ms |
32000 KB |
Output is correct |
6 |
Correct |
24 ms |
32000 KB |
Output is correct |
7 |
Correct |
25 ms |
32020 KB |
Output is correct |
8 |
Correct |
33 ms |
31928 KB |
Output is correct |
9 |
Correct |
26 ms |
32128 KB |
Output is correct |
10 |
Correct |
26 ms |
32228 KB |
Output is correct |
11 |
Correct |
25 ms |
32120 KB |
Output is correct |
12 |
Correct |
29 ms |
32384 KB |
Output is correct |
13 |
Correct |
25 ms |
32384 KB |
Output is correct |
14 |
Correct |
26 ms |
32456 KB |
Output is correct |
15 |
Correct |
24 ms |
32376 KB |
Output is correct |
16 |
Correct |
26 ms |
31932 KB |
Output is correct |
17 |
Correct |
27 ms |
33920 KB |
Output is correct |
18 |
Correct |
23 ms |
32000 KB |
Output is correct |
19 |
Correct |
28 ms |
32120 KB |
Output is correct |
20 |
Correct |
32 ms |
39928 KB |
Output is correct |
21 |
Correct |
32 ms |
31996 KB |
Output is correct |
22 |
Correct |
26 ms |
32000 KB |
Output is correct |
23 |
Correct |
34 ms |
38008 KB |
Output is correct |
24 |
Correct |
33 ms |
39040 KB |
Output is correct |
25 |
Correct |
25 ms |
33536 KB |
Output is correct |
26 |
Correct |
31 ms |
38648 KB |
Output is correct |
27 |
Correct |
31 ms |
39160 KB |
Output is correct |
28 |
Correct |
42 ms |
39928 KB |
Output is correct |
29 |
Correct |
39 ms |
39928 KB |
Output is correct |
30 |
Correct |
34 ms |
39800 KB |
Output is correct |
31 |
Correct |
41 ms |
39900 KB |
Output is correct |
32 |
Correct |
37 ms |
39804 KB |
Output is correct |
33 |
Correct |
46 ms |
39928 KB |
Output is correct |
34 |
Correct |
40 ms |
39928 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
26 ms |
32000 KB |
Output is correct |
2 |
Correct |
29 ms |
31992 KB |
Output is correct |
3 |
Correct |
26 ms |
31992 KB |
Output is correct |
4 |
Correct |
24 ms |
31972 KB |
Output is correct |
5 |
Correct |
26 ms |
32000 KB |
Output is correct |
6 |
Correct |
26 ms |
31992 KB |
Output is correct |
7 |
Correct |
26 ms |
31992 KB |
Output is correct |
8 |
Correct |
26 ms |
31996 KB |
Output is correct |
9 |
Correct |
24 ms |
32128 KB |
Output is correct |
10 |
Correct |
30 ms |
32376 KB |
Output is correct |
11 |
Correct |
24 ms |
31992 KB |
Output is correct |
12 |
Correct |
25 ms |
32376 KB |
Output is correct |
13 |
Correct |
25 ms |
32452 KB |
Output is correct |
14 |
Correct |
30 ms |
32512 KB |
Output is correct |
15 |
Correct |
26 ms |
32356 KB |
Output is correct |
16 |
Correct |
27 ms |
32000 KB |
Output is correct |
17 |
Correct |
26 ms |
33912 KB |
Output is correct |
18 |
Correct |
24 ms |
31992 KB |
Output is correct |
19 |
Correct |
23 ms |
32000 KB |
Output is correct |
20 |
Correct |
31 ms |
39864 KB |
Output is correct |
21 |
Correct |
24 ms |
31992 KB |
Output is correct |
22 |
Correct |
32 ms |
31992 KB |
Output is correct |
23 |
Correct |
30 ms |
37888 KB |
Output is correct |
24 |
Correct |
31 ms |
39236 KB |
Output is correct |
25 |
Correct |
26 ms |
33528 KB |
Output is correct |
26 |
Correct |
31 ms |
38656 KB |
Output is correct |
27 |
Correct |
35 ms |
39288 KB |
Output is correct |
28 |
Correct |
39 ms |
39900 KB |
Output is correct |
29 |
Correct |
36 ms |
39796 KB |
Output is correct |
30 |
Correct |
37 ms |
39800 KB |
Output is correct |
31 |
Correct |
35 ms |
39800 KB |
Output is correct |
32 |
Correct |
41 ms |
39880 KB |
Output is correct |
33 |
Correct |
47 ms |
39884 KB |
Output is correct |
34 |
Correct |
43 ms |
39928 KB |
Output is correct |
35 |
Correct |
46 ms |
38388 KB |
Output is correct |
36 |
Correct |
32 ms |
33724 KB |
Output is correct |
37 |
Correct |
39 ms |
38392 KB |
Output is correct |
38 |
Correct |
42 ms |
37112 KB |
Output is correct |
39 |
Correct |
33 ms |
33016 KB |
Output is correct |
40 |
Correct |
36 ms |
34296 KB |
Output is correct |
41 |
Correct |
49 ms |
40548 KB |
Output is correct |
42 |
Correct |
35 ms |
39356 KB |
Output is correct |
43 |
Correct |
35 ms |
39800 KB |
Output is correct |
44 |
Correct |
36 ms |
40796 KB |
Output is correct |
45 |
Correct |
142 ms |
41000 KB |
Output is correct |
46 |
Correct |
141 ms |
40832 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
24 ms |
32000 KB |
Output is correct |
2 |
Correct |
23 ms |
32000 KB |
Output is correct |
3 |
Correct |
24 ms |
31992 KB |
Output is correct |
4 |
Correct |
24 ms |
32000 KB |
Output is correct |
5 |
Correct |
26 ms |
31992 KB |
Output is correct |
6 |
Correct |
24 ms |
32000 KB |
Output is correct |
7 |
Correct |
23 ms |
32000 KB |
Output is correct |
8 |
Correct |
24 ms |
32000 KB |
Output is correct |
9 |
Correct |
24 ms |
32120 KB |
Output is correct |
10 |
Correct |
26 ms |
32248 KB |
Output is correct |
11 |
Correct |
27 ms |
32128 KB |
Output is correct |
12 |
Correct |
29 ms |
32384 KB |
Output is correct |
13 |
Correct |
21 ms |
32376 KB |
Output is correct |
14 |
Correct |
29 ms |
32612 KB |
Output is correct |
15 |
Correct |
28 ms |
32376 KB |
Output is correct |
16 |
Correct |
24 ms |
32000 KB |
Output is correct |
17 |
Correct |
26 ms |
33912 KB |
Output is correct |
18 |
Correct |
24 ms |
32000 KB |
Output is correct |
19 |
Correct |
23 ms |
32000 KB |
Output is correct |
20 |
Correct |
31 ms |
39928 KB |
Output is correct |
21 |
Correct |
24 ms |
32000 KB |
Output is correct |
22 |
Correct |
26 ms |
32000 KB |
Output is correct |
23 |
Correct |
34 ms |
37752 KB |
Output is correct |
24 |
Correct |
32 ms |
39032 KB |
Output is correct |
25 |
Correct |
25 ms |
33528 KB |
Output is correct |
26 |
Correct |
31 ms |
38648 KB |
Output is correct |
27 |
Correct |
31 ms |
39160 KB |
Output is correct |
28 |
Correct |
37 ms |
39928 KB |
Output is correct |
29 |
Correct |
40 ms |
39800 KB |
Output is correct |
30 |
Correct |
32 ms |
39800 KB |
Output is correct |
31 |
Correct |
46 ms |
39904 KB |
Output is correct |
32 |
Correct |
33 ms |
39800 KB |
Output is correct |
33 |
Correct |
44 ms |
39928 KB |
Output is correct |
34 |
Correct |
38 ms |
39936 KB |
Output is correct |
35 |
Correct |
42 ms |
38460 KB |
Output is correct |
36 |
Correct |
28 ms |
33792 KB |
Output is correct |
37 |
Correct |
38 ms |
38392 KB |
Output is correct |
38 |
Correct |
47 ms |
37000 KB |
Output is correct |
39 |
Correct |
32 ms |
32760 KB |
Output is correct |
40 |
Correct |
36 ms |
34296 KB |
Output is correct |
41 |
Correct |
48 ms |
40568 KB |
Output is correct |
42 |
Correct |
38 ms |
39296 KB |
Output is correct |
43 |
Correct |
39 ms |
39780 KB |
Output is correct |
44 |
Correct |
36 ms |
40828 KB |
Output is correct |
45 |
Correct |
164 ms |
41028 KB |
Output is correct |
46 |
Correct |
147 ms |
40772 KB |
Output is correct |
47 |
Runtime error |
64 ms |
65528 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
48 |
Halted |
0 ms |
0 KB |
- |