#include<bits/stdc++.h>
using namespace std;
const int nax = 3e4 + 3;
const int INF = 1e9;
const long long pr = 1e9 + 9;
const int cax = 1e6 + 3;
int b[nax], p[nax];
vector<int>doges[nax];
vector<pair<long long,int>>dist[cax];
int get(int x, int y) {
long long H = x * pr + y;
int H2 = H % cax;
for(auto x : dist[H2]) {
if(x.first==H) return x.second;
}
return INF;
}
void put(int x, int y, int val) {
long long H = x * pr + y;
int H2 = H % cax;
dist[H2].emplace_back(H, val);
assert(dist[H2].size()<=5);
}
void PlayGround() {
int n, m;
cin>>n>>m;
for(int i=0; i<m; ++i) {
cin>>b[i]>>p[i];
doges[b[i]].push_back(p[i]);
}
put(b[0], 0, 0);
deque<tuple<int,int,int>>dq;
dq.push_back({b[0], 0, 0});
while(!dq.empty()) {
auto x = dq.front();
dq.pop_front();
int ss, j, d;
tie(ss, j, d) = x;
if(d!=get(ss, j)) continue;
if(ss==b[1]) {
cout<<d<<'\n';
return;
}
if(j==0) {
for(int z : doges[ss]) {
if(get(ss, z)>d) {
put(ss, z, d);
dq.emplace_front(ss, z, d);
}
}
} else {
if(ss+j<n) {
if(get(ss+j, j)>d+1) {
put(ss+j, j, d+1);
dq.emplace_back(ss+j, j, d+1);
}
if(get(ss+j, 0)>d+1) {
put(ss+j, 0, d+1);
dq.emplace_back(ss+j, 0, d+1);
}
}
if(ss-j>=0) {
if(get(ss-j, j)>d+1) {
put(ss-j, j, d+1);
dq.emplace_back(ss-j, j, d+1);
}
if(get(ss-j, 0)>d+1) {
put(ss-j, 0, d+1);
dq.emplace_back(ss-j, 0, d+1);
}
}
}
}
cout<<"-1\n";
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
PlayGround();
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
14 ms |
24404 KB |
Output is correct |
2 |
Correct |
13 ms |
24460 KB |
Output is correct |
3 |
Correct |
13 ms |
24404 KB |
Output is correct |
4 |
Correct |
13 ms |
24456 KB |
Output is correct |
5 |
Correct |
13 ms |
24404 KB |
Output is correct |
6 |
Correct |
13 ms |
24412 KB |
Output is correct |
7 |
Correct |
12 ms |
24404 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
12 ms |
24488 KB |
Output is correct |
2 |
Correct |
13 ms |
24488 KB |
Output is correct |
3 |
Correct |
12 ms |
24404 KB |
Output is correct |
4 |
Correct |
12 ms |
24424 KB |
Output is correct |
5 |
Correct |
14 ms |
24532 KB |
Output is correct |
6 |
Correct |
12 ms |
24504 KB |
Output is correct |
7 |
Correct |
13 ms |
24404 KB |
Output is correct |
8 |
Correct |
13 ms |
24404 KB |
Output is correct |
9 |
Correct |
14 ms |
24404 KB |
Output is correct |
10 |
Correct |
13 ms |
24508 KB |
Output is correct |
11 |
Correct |
13 ms |
24472 KB |
Output is correct |
12 |
Correct |
13 ms |
24536 KB |
Output is correct |
13 |
Correct |
12 ms |
24532 KB |
Output is correct |
14 |
Correct |
13 ms |
24660 KB |
Output is correct |
15 |
Correct |
13 ms |
24660 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
13 ms |
24428 KB |
Output is correct |
2 |
Correct |
12 ms |
24404 KB |
Output is correct |
3 |
Correct |
14 ms |
24404 KB |
Output is correct |
4 |
Correct |
12 ms |
24404 KB |
Output is correct |
5 |
Correct |
13 ms |
24404 KB |
Output is correct |
6 |
Correct |
15 ms |
24400 KB |
Output is correct |
7 |
Correct |
13 ms |
24404 KB |
Output is correct |
8 |
Correct |
12 ms |
24512 KB |
Output is correct |
9 |
Correct |
13 ms |
24424 KB |
Output is correct |
10 |
Correct |
13 ms |
24532 KB |
Output is correct |
11 |
Correct |
16 ms |
24472 KB |
Output is correct |
12 |
Correct |
16 ms |
24532 KB |
Output is correct |
13 |
Correct |
13 ms |
24508 KB |
Output is correct |
14 |
Correct |
15 ms |
24692 KB |
Output is correct |
15 |
Correct |
13 ms |
24656 KB |
Output is correct |
16 |
Correct |
13 ms |
24532 KB |
Output is correct |
17 |
Correct |
14 ms |
24636 KB |
Output is correct |
18 |
Correct |
13 ms |
24532 KB |
Output is correct |
19 |
Correct |
13 ms |
24532 KB |
Output is correct |
20 |
Correct |
14 ms |
24660 KB |
Output is correct |
21 |
Correct |
13 ms |
24532 KB |
Output is correct |
22 |
Correct |
13 ms |
24436 KB |
Output is correct |
23 |
Correct |
16 ms |
24676 KB |
Output is correct |
24 |
Correct |
15 ms |
24788 KB |
Output is correct |
25 |
Correct |
14 ms |
24604 KB |
Output is correct |
26 |
Correct |
14 ms |
24692 KB |
Output is correct |
27 |
Correct |
15 ms |
24672 KB |
Output is correct |
28 |
Correct |
17 ms |
25272 KB |
Output is correct |
29 |
Correct |
21 ms |
26412 KB |
Output is correct |
30 |
Correct |
16 ms |
25044 KB |
Output is correct |
31 |
Correct |
17 ms |
25524 KB |
Output is correct |
32 |
Correct |
16 ms |
25332 KB |
Output is correct |
33 |
Correct |
31 ms |
28152 KB |
Output is correct |
34 |
Correct |
22 ms |
26644 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
13 ms |
24448 KB |
Output is correct |
2 |
Correct |
12 ms |
24488 KB |
Output is correct |
3 |
Correct |
12 ms |
24404 KB |
Output is correct |
4 |
Correct |
12 ms |
24404 KB |
Output is correct |
5 |
Correct |
12 ms |
24508 KB |
Output is correct |
6 |
Correct |
13 ms |
24404 KB |
Output is correct |
7 |
Correct |
12 ms |
24500 KB |
Output is correct |
8 |
Correct |
13 ms |
24456 KB |
Output is correct |
9 |
Correct |
13 ms |
24436 KB |
Output is correct |
10 |
Correct |
13 ms |
24420 KB |
Output is correct |
11 |
Correct |
13 ms |
24532 KB |
Output is correct |
12 |
Correct |
12 ms |
24532 KB |
Output is correct |
13 |
Correct |
14 ms |
24532 KB |
Output is correct |
14 |
Correct |
14 ms |
24740 KB |
Output is correct |
15 |
Correct |
14 ms |
24696 KB |
Output is correct |
16 |
Correct |
14 ms |
24532 KB |
Output is correct |
17 |
Correct |
14 ms |
24660 KB |
Output is correct |
18 |
Correct |
13 ms |
24532 KB |
Output is correct |
19 |
Correct |
15 ms |
24532 KB |
Output is correct |
20 |
Correct |
13 ms |
24660 KB |
Output is correct |
21 |
Correct |
13 ms |
24500 KB |
Output is correct |
22 |
Correct |
13 ms |
24516 KB |
Output is correct |
23 |
Correct |
14 ms |
24660 KB |
Output is correct |
24 |
Correct |
14 ms |
24808 KB |
Output is correct |
25 |
Correct |
14 ms |
24524 KB |
Output is correct |
26 |
Correct |
16 ms |
24660 KB |
Output is correct |
27 |
Correct |
14 ms |
24720 KB |
Output is correct |
28 |
Correct |
17 ms |
25184 KB |
Output is correct |
29 |
Correct |
22 ms |
26452 KB |
Output is correct |
30 |
Correct |
15 ms |
25056 KB |
Output is correct |
31 |
Correct |
17 ms |
25604 KB |
Output is correct |
32 |
Correct |
16 ms |
25300 KB |
Output is correct |
33 |
Correct |
33 ms |
28156 KB |
Output is correct |
34 |
Correct |
25 ms |
26584 KB |
Output is correct |
35 |
Correct |
26 ms |
26472 KB |
Output is correct |
36 |
Correct |
14 ms |
24660 KB |
Output is correct |
37 |
Correct |
21 ms |
26068 KB |
Output is correct |
38 |
Correct |
22 ms |
25684 KB |
Output is correct |
39 |
Correct |
18 ms |
24892 KB |
Output is correct |
40 |
Correct |
19 ms |
25164 KB |
Output is correct |
41 |
Correct |
27 ms |
26788 KB |
Output is correct |
42 |
Correct |
16 ms |
24916 KB |
Output is correct |
43 |
Correct |
19 ms |
24968 KB |
Output is correct |
44 |
Correct |
18 ms |
25008 KB |
Output is correct |
45 |
Correct |
140 ms |
38264 KB |
Output is correct |
46 |
Correct |
83 ms |
33008 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
13 ms |
24404 KB |
Output is correct |
2 |
Correct |
13 ms |
24404 KB |
Output is correct |
3 |
Correct |
13 ms |
24404 KB |
Output is correct |
4 |
Correct |
13 ms |
24516 KB |
Output is correct |
5 |
Correct |
13 ms |
24420 KB |
Output is correct |
6 |
Correct |
16 ms |
24492 KB |
Output is correct |
7 |
Correct |
12 ms |
24404 KB |
Output is correct |
8 |
Correct |
14 ms |
24536 KB |
Output is correct |
9 |
Correct |
13 ms |
24504 KB |
Output is correct |
10 |
Correct |
13 ms |
24548 KB |
Output is correct |
11 |
Correct |
15 ms |
24532 KB |
Output is correct |
12 |
Correct |
13 ms |
24552 KB |
Output is correct |
13 |
Correct |
13 ms |
24532 KB |
Output is correct |
14 |
Correct |
13 ms |
24624 KB |
Output is correct |
15 |
Correct |
14 ms |
24660 KB |
Output is correct |
16 |
Correct |
13 ms |
24532 KB |
Output is correct |
17 |
Correct |
13 ms |
24672 KB |
Output is correct |
18 |
Correct |
15 ms |
24508 KB |
Output is correct |
19 |
Correct |
13 ms |
24532 KB |
Output is correct |
20 |
Correct |
14 ms |
24660 KB |
Output is correct |
21 |
Correct |
13 ms |
24532 KB |
Output is correct |
22 |
Correct |
13 ms |
24484 KB |
Output is correct |
23 |
Correct |
16 ms |
24660 KB |
Output is correct |
24 |
Correct |
15 ms |
24768 KB |
Output is correct |
25 |
Correct |
14 ms |
24512 KB |
Output is correct |
26 |
Correct |
14 ms |
24660 KB |
Output is correct |
27 |
Correct |
14 ms |
24660 KB |
Output is correct |
28 |
Correct |
17 ms |
25172 KB |
Output is correct |
29 |
Correct |
23 ms |
26496 KB |
Output is correct |
30 |
Correct |
17 ms |
25100 KB |
Output is correct |
31 |
Correct |
17 ms |
25568 KB |
Output is correct |
32 |
Correct |
16 ms |
25328 KB |
Output is correct |
33 |
Correct |
33 ms |
28088 KB |
Output is correct |
34 |
Correct |
22 ms |
26524 KB |
Output is correct |
35 |
Correct |
26 ms |
26580 KB |
Output is correct |
36 |
Correct |
14 ms |
24660 KB |
Output is correct |
37 |
Correct |
22 ms |
26144 KB |
Output is correct |
38 |
Correct |
22 ms |
25684 KB |
Output is correct |
39 |
Correct |
20 ms |
24916 KB |
Output is correct |
40 |
Correct |
21 ms |
25224 KB |
Output is correct |
41 |
Correct |
27 ms |
26800 KB |
Output is correct |
42 |
Correct |
18 ms |
24916 KB |
Output is correct |
43 |
Correct |
17 ms |
25008 KB |
Output is correct |
44 |
Correct |
17 ms |
25044 KB |
Output is correct |
45 |
Correct |
145 ms |
38304 KB |
Output is correct |
46 |
Correct |
85 ms |
33020 KB |
Output is correct |
47 |
Correct |
26 ms |
26592 KB |
Output is correct |
48 |
Correct |
19 ms |
25120 KB |
Output is correct |
49 |
Correct |
18 ms |
25064 KB |
Output is correct |
50 |
Correct |
19 ms |
24988 KB |
Output is correct |
51 |
Correct |
36 ms |
27656 KB |
Output is correct |
52 |
Correct |
37 ms |
27964 KB |
Output is correct |
53 |
Correct |
22 ms |
25584 KB |
Output is correct |
54 |
Correct |
16 ms |
25428 KB |
Output is correct |
55 |
Correct |
19 ms |
25900 KB |
Output is correct |
56 |
Correct |
27 ms |
27436 KB |
Output is correct |
57 |
Correct |
14 ms |
24532 KB |
Output is correct |
58 |
Correct |
33 ms |
27788 KB |
Output is correct |
59 |
Correct |
34 ms |
27512 KB |
Output is correct |
60 |
Correct |
34 ms |
27472 KB |
Output is correct |
61 |
Correct |
31 ms |
27312 KB |
Output is correct |
62 |
Runtime error |
96 ms |
63832 KB |
Execution killed with signal 6 |
63 |
Halted |
0 ms |
0 KB |
- |