#include <queue>
#include <cstdio>
#include <cctype>
#include <vector>
#include <bitset>
#include <algorithm>
using namespace std;
#define FOR(i,j,k) for(int i=j; i<=k; ++i)
#define ROF(i,j,k) for(int i=j; i>=k; --i)
inline int read (void) {
int x = 0, f = 1, ch = getchar();
while(!isdigit(ch)) { if(ch == '-') f = -f; ch = getchar(); }
while(isdigit(ch)) { x = x * 10 + ch - '0'; ch = getchar(); }
return x * f;
}
const int maxn = 30005;
struct Node {
int pos, fot, dis;
};
bitset <maxn> b[maxn];
vector <int> v[maxn];
queue <Node> q;
int d[maxn];
int main (void) {
int n = read(), m = read(), p0 = -1, p1 = -1;
FOR(i,1,m) {
int x = read(), y = read();
if(p0 == -1) p0 = x;
else if(p1 == -1) p1 = x;
v[x].push_back(y);
}
d[p0] = 1;
for(auto&it:v[p0])
if(!b[p0].test(it)) {
b[p0].set(it);
q.push((Node) {p0, it, 1});
}
while(!d[p1] && !q.empty()) {
Node cur = q.front(); q.pop();
int x = cur.pos, y = cur.fot, z = cur.dis;
if(x - y >= 0 && !b[x-y].test(y)) {
b[x-y].set(y);
q.push((Node) {x-y, y, z+1});
if(!d[x-y]) {
d[x-y] = z+1;
for(auto&it:v[x-y])
if(!b[x-y].test(it)) {
b[x-y].set(it);
q.push((Node) {x-y, it, z+1});
}
}
}
if(x + y < n && !b[x+y].test(y)) {
b[x+y].set(y);
q.push((Node) {x+y, y, z+1});
if(!d[x+y]) {
d[x+y] = z+1;
for(auto&it:v[x+y])
if(!b[x+y].test(it)) {
b[x+y].set(it);
q.push((Node) {x+y, it, z+1});
}
}
}
}
printf("%d\n", d[p1]-1);
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
980 KB |
Output is correct |
2 |
Correct |
1 ms |
980 KB |
Output is correct |
3 |
Correct |
1 ms |
1008 KB |
Output is correct |
4 |
Correct |
1 ms |
980 KB |
Output is correct |
5 |
Correct |
1 ms |
980 KB |
Output is correct |
6 |
Correct |
1 ms |
1000 KB |
Output is correct |
7 |
Correct |
1 ms |
1004 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
980 KB |
Output is correct |
2 |
Correct |
1 ms |
1000 KB |
Output is correct |
3 |
Correct |
1 ms |
1004 KB |
Output is correct |
4 |
Correct |
1 ms |
980 KB |
Output is correct |
5 |
Correct |
1 ms |
980 KB |
Output is correct |
6 |
Correct |
1 ms |
980 KB |
Output is correct |
7 |
Correct |
1 ms |
972 KB |
Output is correct |
8 |
Correct |
1 ms |
1004 KB |
Output is correct |
9 |
Correct |
1 ms |
1108 KB |
Output is correct |
10 |
Correct |
1 ms |
1132 KB |
Output is correct |
11 |
Correct |
1 ms |
980 KB |
Output is correct |
12 |
Correct |
1 ms |
1236 KB |
Output is correct |
13 |
Correct |
1 ms |
1392 KB |
Output is correct |
14 |
Correct |
1 ms |
1364 KB |
Output is correct |
15 |
Correct |
1 ms |
1364 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
1004 KB |
Output is correct |
2 |
Correct |
1 ms |
980 KB |
Output is correct |
3 |
Correct |
1 ms |
980 KB |
Output is correct |
4 |
Correct |
1 ms |
980 KB |
Output is correct |
5 |
Correct |
2 ms |
980 KB |
Output is correct |
6 |
Correct |
1 ms |
980 KB |
Output is correct |
7 |
Correct |
1 ms |
980 KB |
Output is correct |
8 |
Correct |
1 ms |
980 KB |
Output is correct |
9 |
Correct |
1 ms |
1108 KB |
Output is correct |
10 |
Correct |
1 ms |
1108 KB |
Output is correct |
11 |
Correct |
1 ms |
980 KB |
Output is correct |
12 |
Correct |
1 ms |
1236 KB |
Output is correct |
13 |
Correct |
1 ms |
1396 KB |
Output is correct |
14 |
Correct |
1 ms |
1364 KB |
Output is correct |
15 |
Correct |
1 ms |
1364 KB |
Output is correct |
16 |
Correct |
1 ms |
980 KB |
Output is correct |
17 |
Correct |
2 ms |
3284 KB |
Output is correct |
18 |
Correct |
1 ms |
980 KB |
Output is correct |
19 |
Correct |
1 ms |
980 KB |
Output is correct |
20 |
Correct |
5 ms |
8404 KB |
Output is correct |
21 |
Correct |
1 ms |
980 KB |
Output is correct |
22 |
Correct |
1 ms |
980 KB |
Output is correct |
23 |
Correct |
4 ms |
6356 KB |
Output is correct |
24 |
Correct |
5 ms |
7380 KB |
Output is correct |
25 |
Correct |
2 ms |
2388 KB |
Output is correct |
26 |
Correct |
5 ms |
7288 KB |
Output is correct |
27 |
Correct |
5 ms |
7636 KB |
Output is correct |
28 |
Correct |
6 ms |
8404 KB |
Output is correct |
29 |
Correct |
6 ms |
8276 KB |
Output is correct |
30 |
Correct |
5 ms |
8296 KB |
Output is correct |
31 |
Correct |
5 ms |
8276 KB |
Output is correct |
32 |
Correct |
5 ms |
8276 KB |
Output is correct |
33 |
Correct |
7 ms |
8320 KB |
Output is correct |
34 |
Correct |
6 ms |
8296 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
980 KB |
Output is correct |
2 |
Correct |
1 ms |
980 KB |
Output is correct |
3 |
Correct |
1 ms |
980 KB |
Output is correct |
4 |
Correct |
1 ms |
980 KB |
Output is correct |
5 |
Correct |
1 ms |
980 KB |
Output is correct |
6 |
Correct |
1 ms |
980 KB |
Output is correct |
7 |
Correct |
1 ms |
980 KB |
Output is correct |
8 |
Correct |
1 ms |
1004 KB |
Output is correct |
9 |
Correct |
1 ms |
1108 KB |
Output is correct |
10 |
Correct |
1 ms |
1108 KB |
Output is correct |
11 |
Correct |
1 ms |
980 KB |
Output is correct |
12 |
Correct |
1 ms |
1236 KB |
Output is correct |
13 |
Correct |
1 ms |
1364 KB |
Output is correct |
14 |
Correct |
1 ms |
1364 KB |
Output is correct |
15 |
Correct |
1 ms |
1396 KB |
Output is correct |
16 |
Correct |
1 ms |
1008 KB |
Output is correct |
17 |
Correct |
3 ms |
3284 KB |
Output is correct |
18 |
Correct |
1 ms |
980 KB |
Output is correct |
19 |
Correct |
1 ms |
1012 KB |
Output is correct |
20 |
Correct |
5 ms |
8312 KB |
Output is correct |
21 |
Correct |
1 ms |
980 KB |
Output is correct |
22 |
Correct |
1 ms |
980 KB |
Output is correct |
23 |
Correct |
4 ms |
6356 KB |
Output is correct |
24 |
Correct |
5 ms |
7412 KB |
Output is correct |
25 |
Correct |
2 ms |
2388 KB |
Output is correct |
26 |
Correct |
5 ms |
7284 KB |
Output is correct |
27 |
Correct |
5 ms |
7636 KB |
Output is correct |
28 |
Correct |
6 ms |
8440 KB |
Output is correct |
29 |
Correct |
6 ms |
8304 KB |
Output is correct |
30 |
Correct |
6 ms |
8276 KB |
Output is correct |
31 |
Correct |
6 ms |
8292 KB |
Output is correct |
32 |
Correct |
5 ms |
8276 KB |
Output is correct |
33 |
Correct |
7 ms |
8308 KB |
Output is correct |
34 |
Correct |
6 ms |
8304 KB |
Output is correct |
35 |
Correct |
7 ms |
6900 KB |
Output is correct |
36 |
Correct |
2 ms |
2004 KB |
Output is correct |
37 |
Correct |
5 ms |
6004 KB |
Output is correct |
38 |
Correct |
7 ms |
7764 KB |
Output is correct |
39 |
Correct |
3 ms |
1560 KB |
Output is correct |
40 |
Correct |
4 ms |
1660 KB |
Output is correct |
41 |
Correct |
5 ms |
2900 KB |
Output is correct |
42 |
Correct |
6 ms |
7636 KB |
Output is correct |
43 |
Correct |
6 ms |
8052 KB |
Output is correct |
44 |
Correct |
7 ms |
8692 KB |
Output is correct |
45 |
Correct |
16 ms |
9108 KB |
Output is correct |
46 |
Correct |
10 ms |
9068 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
980 KB |
Output is correct |
2 |
Correct |
1 ms |
980 KB |
Output is correct |
3 |
Correct |
1 ms |
980 KB |
Output is correct |
4 |
Correct |
1 ms |
1000 KB |
Output is correct |
5 |
Correct |
1 ms |
980 KB |
Output is correct |
6 |
Correct |
2 ms |
980 KB |
Output is correct |
7 |
Correct |
1 ms |
980 KB |
Output is correct |
8 |
Correct |
1 ms |
996 KB |
Output is correct |
9 |
Correct |
1 ms |
1108 KB |
Output is correct |
10 |
Correct |
1 ms |
1108 KB |
Output is correct |
11 |
Correct |
1 ms |
980 KB |
Output is correct |
12 |
Correct |
1 ms |
1236 KB |
Output is correct |
13 |
Correct |
1 ms |
1364 KB |
Output is correct |
14 |
Correct |
1 ms |
1364 KB |
Output is correct |
15 |
Correct |
1 ms |
1396 KB |
Output is correct |
16 |
Correct |
1 ms |
1008 KB |
Output is correct |
17 |
Correct |
2 ms |
3324 KB |
Output is correct |
18 |
Correct |
1 ms |
1016 KB |
Output is correct |
19 |
Correct |
1 ms |
1000 KB |
Output is correct |
20 |
Correct |
5 ms |
8404 KB |
Output is correct |
21 |
Correct |
1 ms |
980 KB |
Output is correct |
22 |
Correct |
1 ms |
980 KB |
Output is correct |
23 |
Correct |
4 ms |
6356 KB |
Output is correct |
24 |
Correct |
5 ms |
7384 KB |
Output is correct |
25 |
Correct |
2 ms |
2420 KB |
Output is correct |
26 |
Correct |
5 ms |
7252 KB |
Output is correct |
27 |
Correct |
5 ms |
7676 KB |
Output is correct |
28 |
Correct |
6 ms |
8360 KB |
Output is correct |
29 |
Correct |
7 ms |
8276 KB |
Output is correct |
30 |
Correct |
5 ms |
8304 KB |
Output is correct |
31 |
Correct |
5 ms |
8276 KB |
Output is correct |
32 |
Correct |
5 ms |
8276 KB |
Output is correct |
33 |
Correct |
7 ms |
8308 KB |
Output is correct |
34 |
Correct |
6 ms |
8312 KB |
Output is correct |
35 |
Correct |
6 ms |
6868 KB |
Output is correct |
36 |
Correct |
2 ms |
2004 KB |
Output is correct |
37 |
Correct |
5 ms |
6004 KB |
Output is correct |
38 |
Correct |
7 ms |
7800 KB |
Output is correct |
39 |
Correct |
4 ms |
1528 KB |
Output is correct |
40 |
Correct |
3 ms |
1656 KB |
Output is correct |
41 |
Correct |
4 ms |
2808 KB |
Output is correct |
42 |
Correct |
5 ms |
7636 KB |
Output is correct |
43 |
Correct |
7 ms |
8056 KB |
Output is correct |
44 |
Correct |
6 ms |
8740 KB |
Output is correct |
45 |
Correct |
14 ms |
9064 KB |
Output is correct |
46 |
Correct |
12 ms |
9044 KB |
Output is correct |
47 |
Correct |
10 ms |
13288 KB |
Output is correct |
48 |
Correct |
4 ms |
1620 KB |
Output is correct |
49 |
Correct |
4 ms |
1620 KB |
Output is correct |
50 |
Correct |
3 ms |
1492 KB |
Output is correct |
51 |
Correct |
49 ms |
78736 KB |
Output is correct |
52 |
Correct |
58 ms |
87756 KB |
Output is correct |
53 |
Correct |
15 ms |
18772 KB |
Output is correct |
54 |
Correct |
33 ms |
61244 KB |
Output is correct |
55 |
Correct |
46 ms |
77928 KB |
Output is correct |
56 |
Correct |
66 ms |
112356 KB |
Output is correct |
57 |
Correct |
2 ms |
2516 KB |
Output is correct |
58 |
Correct |
62 ms |
111600 KB |
Output is correct |
59 |
Correct |
60 ms |
103868 KB |
Output is correct |
60 |
Correct |
59 ms |
103888 KB |
Output is correct |
61 |
Correct |
56 ms |
98848 KB |
Output is correct |
62 |
Correct |
90 ms |
112456 KB |
Output is correct |
63 |
Correct |
133 ms |
111988 KB |
Output is correct |
64 |
Correct |
162 ms |
111820 KB |
Output is correct |
65 |
Correct |
216 ms |
111912 KB |
Output is correct |
66 |
Correct |
430 ms |
112052 KB |
Output is correct |
67 |
Correct |
221 ms |
111904 KB |
Output is correct |