#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <vector>
#include <queue>
#include <map>
#include <functional>
#include <utility>
#define fi first
#define se second
using namespace std;
typedef pair<int, int> pii;
int N, M, b[30005], p[30005], seen[30005];
vector<int> doges[30005];
map<int, int> dists;
queue<int> q;
int id(int d, int x) {
return d * 30001 + x;
}
void visit(int pos, int d) {
//printf("visit(%d, %d)\n", pos, d);
seen[pos] = 1;
for (int doge : doges[pos]) {
dists[id(pos, doge)] = d;
q.push(id(pos, doge));
}
}
int main() {
scanf("%d %d", &N, &M);
for (int i = 0; i < M; i++) {
scanf("%d %d", b+i, p+i);
doges[b[i]].push_back(p[i]);
}
visit(b[0], 0);
while (q.size()) {
int e = q.front(); q.pop();
int loc = e / 30001, power = e % 30001;
//printf("At (%d, %d) (dist %d)\n", loc, power, dists[e]);
if (loc == b[1]) {
printf("%d\n", dists[e]);
return 0;
}
if (loc - power >= 0) {
int pos = loc - power;
int d = power;
if (!seen[pos]) {
visit(pos, dists[e] + 1);
}
if (dists.find(id(pos, d)) == dists.end()) {
dists[id(pos, d)] = dists[e] + 1;
q.push(id(pos, d));
}
}
if (loc + power < N) {
int pos = loc + power;
int d = power;
if (!seen[pos]) {
visit(pos, dists[e] + 1);
}
if (dists.find(id(pos, d)) == dists.end()) {
dists[id(pos, d)] = dists[e] + 1;
q.push(id(pos, d));
}
}
}
printf("-1\n");
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &N, &M);
~~~~~^~~~~~~~~~~~~~~~~
skyscraper.cpp:36:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", b+i, p+i);
~~~~~^~~~~~~~~~~~~~~~~~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
1024 KB |
Output is correct |
2 |
Correct |
5 ms |
1024 KB |
Output is correct |
3 |
Correct |
5 ms |
1024 KB |
Output is correct |
4 |
Correct |
5 ms |
1024 KB |
Output is correct |
5 |
Correct |
5 ms |
1024 KB |
Output is correct |
6 |
Correct |
5 ms |
1024 KB |
Output is correct |
7 |
Correct |
5 ms |
1024 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
6 ms |
1152 KB |
Output is correct |
2 |
Correct |
5 ms |
1024 KB |
Output is correct |
3 |
Correct |
5 ms |
1024 KB |
Output is correct |
4 |
Correct |
5 ms |
1024 KB |
Output is correct |
5 |
Correct |
5 ms |
1024 KB |
Output is correct |
6 |
Correct |
5 ms |
1024 KB |
Output is correct |
7 |
Correct |
5 ms |
1024 KB |
Output is correct |
8 |
Correct |
5 ms |
1024 KB |
Output is correct |
9 |
Correct |
5 ms |
1024 KB |
Output is correct |
10 |
Correct |
5 ms |
1024 KB |
Output is correct |
11 |
Correct |
6 ms |
1152 KB |
Output is correct |
12 |
Correct |
5 ms |
1024 KB |
Output is correct |
13 |
Correct |
5 ms |
1024 KB |
Output is correct |
14 |
Correct |
7 ms |
1280 KB |
Output is correct |
15 |
Correct |
6 ms |
1280 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
1024 KB |
Output is correct |
2 |
Correct |
5 ms |
1024 KB |
Output is correct |
3 |
Correct |
5 ms |
1024 KB |
Output is correct |
4 |
Correct |
5 ms |
1024 KB |
Output is correct |
5 |
Correct |
5 ms |
1024 KB |
Output is correct |
6 |
Correct |
5 ms |
1024 KB |
Output is correct |
7 |
Correct |
5 ms |
1024 KB |
Output is correct |
8 |
Correct |
5 ms |
1024 KB |
Output is correct |
9 |
Correct |
5 ms |
1024 KB |
Output is correct |
10 |
Correct |
5 ms |
1024 KB |
Output is correct |
11 |
Correct |
6 ms |
1280 KB |
Output is correct |
12 |
Correct |
5 ms |
1152 KB |
Output is correct |
13 |
Correct |
5 ms |
1024 KB |
Output is correct |
14 |
Correct |
8 ms |
1280 KB |
Output is correct |
15 |
Correct |
6 ms |
1280 KB |
Output is correct |
16 |
Correct |
5 ms |
1024 KB |
Output is correct |
17 |
Correct |
7 ms |
1280 KB |
Output is correct |
18 |
Correct |
5 ms |
1024 KB |
Output is correct |
19 |
Correct |
6 ms |
1024 KB |
Output is correct |
20 |
Correct |
6 ms |
1152 KB |
Output is correct |
21 |
Correct |
5 ms |
1024 KB |
Output is correct |
22 |
Correct |
6 ms |
1024 KB |
Output is correct |
23 |
Correct |
7 ms |
1280 KB |
Output is correct |
24 |
Correct |
9 ms |
1408 KB |
Output is correct |
25 |
Correct |
7 ms |
1152 KB |
Output is correct |
26 |
Correct |
6 ms |
1152 KB |
Output is correct |
27 |
Correct |
7 ms |
1280 KB |
Output is correct |
28 |
Correct |
15 ms |
2048 KB |
Output is correct |
29 |
Correct |
46 ms |
3960 KB |
Output is correct |
30 |
Correct |
13 ms |
1792 KB |
Output is correct |
31 |
Correct |
23 ms |
2560 KB |
Output is correct |
32 |
Correct |
17 ms |
2176 KB |
Output is correct |
33 |
Correct |
114 ms |
6652 KB |
Output is correct |
34 |
Correct |
50 ms |
4088 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
1024 KB |
Output is correct |
2 |
Correct |
5 ms |
1024 KB |
Output is correct |
3 |
Correct |
5 ms |
1024 KB |
Output is correct |
4 |
Correct |
5 ms |
1024 KB |
Output is correct |
5 |
Correct |
5 ms |
1024 KB |
Output is correct |
6 |
Correct |
5 ms |
1024 KB |
Output is correct |
7 |
Correct |
5 ms |
1024 KB |
Output is correct |
8 |
Correct |
5 ms |
1024 KB |
Output is correct |
9 |
Correct |
5 ms |
1024 KB |
Output is correct |
10 |
Correct |
6 ms |
1024 KB |
Output is correct |
11 |
Correct |
5 ms |
1152 KB |
Output is correct |
12 |
Correct |
5 ms |
1024 KB |
Output is correct |
13 |
Correct |
5 ms |
1024 KB |
Output is correct |
14 |
Correct |
8 ms |
1408 KB |
Output is correct |
15 |
Correct |
6 ms |
1280 KB |
Output is correct |
16 |
Correct |
5 ms |
1024 KB |
Output is correct |
17 |
Correct |
7 ms |
1280 KB |
Output is correct |
18 |
Correct |
5 ms |
1024 KB |
Output is correct |
19 |
Correct |
5 ms |
1024 KB |
Output is correct |
20 |
Correct |
6 ms |
1152 KB |
Output is correct |
21 |
Correct |
5 ms |
1024 KB |
Output is correct |
22 |
Correct |
5 ms |
1024 KB |
Output is correct |
23 |
Correct |
7 ms |
1280 KB |
Output is correct |
24 |
Correct |
8 ms |
1408 KB |
Output is correct |
25 |
Correct |
6 ms |
1152 KB |
Output is correct |
26 |
Correct |
6 ms |
1152 KB |
Output is correct |
27 |
Correct |
7 ms |
1280 KB |
Output is correct |
28 |
Correct |
16 ms |
2048 KB |
Output is correct |
29 |
Correct |
45 ms |
3832 KB |
Output is correct |
30 |
Correct |
13 ms |
1792 KB |
Output is correct |
31 |
Correct |
23 ms |
2560 KB |
Output is correct |
32 |
Correct |
17 ms |
2176 KB |
Output is correct |
33 |
Correct |
104 ms |
6648 KB |
Output is correct |
34 |
Correct |
50 ms |
4088 KB |
Output is correct |
35 |
Correct |
31 ms |
3960 KB |
Output is correct |
36 |
Correct |
7 ms |
1280 KB |
Output is correct |
37 |
Correct |
25 ms |
3328 KB |
Output is correct |
38 |
Correct |
34 ms |
4476 KB |
Output is correct |
39 |
Correct |
14 ms |
1792 KB |
Output is correct |
40 |
Correct |
16 ms |
2304 KB |
Output is correct |
41 |
Correct |
22 ms |
3328 KB |
Output is correct |
42 |
Correct |
11 ms |
1664 KB |
Output is correct |
43 |
Correct |
15 ms |
1920 KB |
Output is correct |
44 |
Correct |
13 ms |
1792 KB |
Output is correct |
45 |
Correct |
650 ms |
24440 KB |
Output is correct |
46 |
Correct |
255 ms |
14328 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
1024 KB |
Output is correct |
2 |
Correct |
5 ms |
1024 KB |
Output is correct |
3 |
Correct |
5 ms |
1024 KB |
Output is correct |
4 |
Correct |
5 ms |
1024 KB |
Output is correct |
5 |
Correct |
5 ms |
1024 KB |
Output is correct |
6 |
Correct |
5 ms |
1024 KB |
Output is correct |
7 |
Correct |
5 ms |
1024 KB |
Output is correct |
8 |
Correct |
5 ms |
1024 KB |
Output is correct |
9 |
Correct |
5 ms |
1024 KB |
Output is correct |
10 |
Correct |
5 ms |
1024 KB |
Output is correct |
11 |
Correct |
6 ms |
1152 KB |
Output is correct |
12 |
Correct |
5 ms |
1024 KB |
Output is correct |
13 |
Correct |
5 ms |
1024 KB |
Output is correct |
14 |
Correct |
8 ms |
1280 KB |
Output is correct |
15 |
Correct |
6 ms |
1280 KB |
Output is correct |
16 |
Correct |
5 ms |
1024 KB |
Output is correct |
17 |
Correct |
7 ms |
1280 KB |
Output is correct |
18 |
Correct |
5 ms |
1024 KB |
Output is correct |
19 |
Correct |
5 ms |
1024 KB |
Output is correct |
20 |
Correct |
6 ms |
1152 KB |
Output is correct |
21 |
Correct |
5 ms |
1024 KB |
Output is correct |
22 |
Correct |
5 ms |
1024 KB |
Output is correct |
23 |
Correct |
7 ms |
1280 KB |
Output is correct |
24 |
Correct |
9 ms |
1408 KB |
Output is correct |
25 |
Correct |
6 ms |
1152 KB |
Output is correct |
26 |
Correct |
7 ms |
1280 KB |
Output is correct |
27 |
Correct |
7 ms |
1280 KB |
Output is correct |
28 |
Correct |
15 ms |
2048 KB |
Output is correct |
29 |
Correct |
46 ms |
3832 KB |
Output is correct |
30 |
Correct |
13 ms |
1792 KB |
Output is correct |
31 |
Correct |
23 ms |
2560 KB |
Output is correct |
32 |
Correct |
17 ms |
2176 KB |
Output is correct |
33 |
Correct |
131 ms |
6776 KB |
Output is correct |
34 |
Correct |
51 ms |
4088 KB |
Output is correct |
35 |
Correct |
31 ms |
3960 KB |
Output is correct |
36 |
Correct |
7 ms |
1280 KB |
Output is correct |
37 |
Correct |
25 ms |
3320 KB |
Output is correct |
38 |
Correct |
34 ms |
4472 KB |
Output is correct |
39 |
Correct |
14 ms |
1792 KB |
Output is correct |
40 |
Correct |
16 ms |
2304 KB |
Output is correct |
41 |
Correct |
21 ms |
3328 KB |
Output is correct |
42 |
Correct |
11 ms |
1664 KB |
Output is correct |
43 |
Correct |
13 ms |
1920 KB |
Output is correct |
44 |
Correct |
13 ms |
1912 KB |
Output is correct |
45 |
Correct |
647 ms |
24440 KB |
Output is correct |
46 |
Correct |
254 ms |
14328 KB |
Output is correct |
47 |
Correct |
23 ms |
3200 KB |
Output is correct |
48 |
Correct |
13 ms |
1920 KB |
Output is correct |
49 |
Correct |
13 ms |
1920 KB |
Output is correct |
50 |
Correct |
10 ms |
1664 KB |
Output is correct |
51 |
Correct |
47 ms |
4856 KB |
Output is correct |
52 |
Correct |
56 ms |
5368 KB |
Output is correct |
53 |
Correct |
18 ms |
2560 KB |
Output is correct |
54 |
Correct |
10 ms |
1792 KB |
Output is correct |
55 |
Correct |
15 ms |
2304 KB |
Output is correct |
56 |
Correct |
25 ms |
3968 KB |
Output is correct |
57 |
Correct |
7 ms |
1152 KB |
Output is correct |
58 |
Correct |
42 ms |
4728 KB |
Output is correct |
59 |
Correct |
38 ms |
4472 KB |
Output is correct |
60 |
Correct |
38 ms |
4344 KB |
Output is correct |
61 |
Correct |
39 ms |
4360 KB |
Output is correct |
62 |
Correct |
454 ms |
23672 KB |
Output is correct |
63 |
Execution timed out |
1099 ms |
37624 KB |
Time limit exceeded |
64 |
Halted |
0 ms |
0 KB |
- |