# include <bits/stdc++.h>
# include <unordered_map>
# define fi first
# define se second
using namespace std;
const int sq = 200;
vector<int> dg[30001];
map< pair<int, int> , int> jp;
int st, js, ed;
int rc[30001];
int main() {
int N, M;
scanf("%d %d", &N, &M);
for(int i=0;i<N;i++) rc[i] = 1e9;
for(int i=0;i<M;i++) {
int a, b;
scanf("%d %d", &a, &b);
if(i == 0) {
st = a;
js = b;
} else if(i == 1) ed = a;
else dg[a].push_back(b);
}
queue< pair<pair<int, int>, int> > BFS;
BFS.push(make_pair(make_pair(st, 0), js));
while(BFS.size()) {
int a, b, c;
a = BFS.front().fi.fi;
b = BFS.front().fi.se;
c = BFS.front().se;
// cout<<a<<" "<<b<<" "<
BFS.pop();
rc[a] = min(rc[a], b);
if(a - c >= 0 && jp[make_pair(a - c, c)] == 0) {
BFS.push(make_pair(make_pair(a - c, b + 1), c));
jp[make_pair(a - c, c)] = 1;
}
if(a + c < N && jp[make_pair(a + c, c)] == 0) {
BFS.push(make_pair(make_pair(a+c, b + 1), c));
jp[make_pair(a + c, c)] = 1;
}
for(int k=0;k<dg[a].size();k++) {
c = dg[a][k];
if(a - c >= 0 && jp[make_pair(a - c, c)] == 0) {
BFS.push(make_pair(make_pair(a - c, b + 1), c));
jp[make_pair(a - c, c)] = 1;
}
if(a + c < N && jp[make_pair(a + c, c)] == 0) {
BFS.push(make_pair(make_pair(a+c, b + 1), c));
jp[make_pair(a + c, c)] = 1;
}
}
}
if(rc[ed] == 1e9) rc[ed] = -1;
printf("%d\n", rc[ed]);
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:48:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
48 | for(int k=0;k<dg[a].size();k++) {
| ~^~~~~~~~~~~~~
skyscraper.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
16 | scanf("%d %d", &N, &M);
| ~~~~~^~~~~~~~~~~~~~~~~
skyscraper.cpp:21:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
21 | scanf("%d %d", &a, &b);
| ~~~~~^~~~~~~~~~~~~~~~~
# |
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 |
# |
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 |
1108 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 |
1020 KB |
Output is correct |
9 |
Correct |
1 ms |
1012 KB |
Output is correct |
10 |
Correct |
2 ms |
1016 KB |
Output is correct |
11 |
Correct |
7 ms |
1236 KB |
Output is correct |
12 |
Correct |
2 ms |
980 KB |
Output is correct |
13 |
Correct |
1 ms |
980 KB |
Output is correct |
14 |
Correct |
7 ms |
1364 KB |
Output is correct |
15 |
Correct |
7 ms |
1364 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 |
1008 KB |
Output is correct |
7 |
Correct |
1 ms |
1012 KB |
Output is correct |
8 |
Correct |
1 ms |
980 KB |
Output is correct |
9 |
Correct |
1 ms |
980 KB |
Output is correct |
10 |
Correct |
2 ms |
1108 KB |
Output is correct |
11 |
Correct |
7 ms |
1248 KB |
Output is correct |
12 |
Correct |
2 ms |
1108 KB |
Output is correct |
13 |
Correct |
2 ms |
980 KB |
Output is correct |
14 |
Correct |
7 ms |
1364 KB |
Output is correct |
15 |
Correct |
7 ms |
1344 KB |
Output is correct |
16 |
Correct |
1 ms |
980 KB |
Output is correct |
17 |
Correct |
12 ms |
1860 KB |
Output is correct |
18 |
Correct |
1 ms |
980 KB |
Output is correct |
19 |
Correct |
1 ms |
980 KB |
Output is correct |
20 |
Correct |
2 ms |
1108 KB |
Output is correct |
21 |
Correct |
1 ms |
980 KB |
Output is correct |
22 |
Correct |
1 ms |
1016 KB |
Output is correct |
23 |
Correct |
3 ms |
1364 KB |
Output is correct |
24 |
Correct |
7 ms |
1756 KB |
Output is correct |
25 |
Correct |
3 ms |
1236 KB |
Output is correct |
26 |
Correct |
4 ms |
1512 KB |
Output is correct |
27 |
Correct |
10 ms |
1464 KB |
Output is correct |
28 |
Correct |
10 ms |
2260 KB |
Output is correct |
29 |
Correct |
29 ms |
4768 KB |
Output is correct |
30 |
Correct |
7 ms |
2004 KB |
Output is correct |
31 |
Correct |
16 ms |
3160 KB |
Output is correct |
32 |
Correct |
12 ms |
2548 KB |
Output is correct |
33 |
Correct |
76 ms |
8508 KB |
Output is correct |
34 |
Correct |
67 ms |
8540 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
980 KB |
Output is correct |
2 |
Correct |
1 ms |
1012 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 |
1012 KB |
Output is correct |
6 |
Correct |
1 ms |
1016 KB |
Output is correct |
7 |
Correct |
1 ms |
980 KB |
Output is correct |
8 |
Correct |
1 ms |
1008 KB |
Output is correct |
9 |
Correct |
1 ms |
1012 KB |
Output is correct |
10 |
Correct |
2 ms |
1108 KB |
Output is correct |
11 |
Correct |
7 ms |
1256 KB |
Output is correct |
12 |
Correct |
2 ms |
980 KB |
Output is correct |
13 |
Correct |
1 ms |
980 KB |
Output is correct |
14 |
Correct |
7 ms |
1364 KB |
Output is correct |
15 |
Correct |
7 ms |
1364 KB |
Output is correct |
16 |
Correct |
1 ms |
980 KB |
Output is correct |
17 |
Correct |
12 ms |
1920 KB |
Output is correct |
18 |
Correct |
1 ms |
980 KB |
Output is correct |
19 |
Correct |
1 ms |
980 KB |
Output is correct |
20 |
Correct |
1 ms |
1108 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 |
1364 KB |
Output is correct |
24 |
Correct |
7 ms |
1748 KB |
Output is correct |
25 |
Correct |
3 ms |
1324 KB |
Output is correct |
26 |
Correct |
4 ms |
1492 KB |
Output is correct |
27 |
Correct |
10 ms |
1380 KB |
Output is correct |
28 |
Correct |
9 ms |
2260 KB |
Output is correct |
29 |
Correct |
28 ms |
4820 KB |
Output is correct |
30 |
Correct |
7 ms |
2004 KB |
Output is correct |
31 |
Correct |
14 ms |
3100 KB |
Output is correct |
32 |
Correct |
11 ms |
2428 KB |
Output is correct |
33 |
Correct |
68 ms |
8520 KB |
Output is correct |
34 |
Correct |
67 ms |
8544 KB |
Output is correct |
35 |
Correct |
248 ms |
6968 KB |
Output is correct |
36 |
Correct |
12 ms |
2048 KB |
Output is correct |
37 |
Correct |
549 ms |
12104 KB |
Output is correct |
38 |
Correct |
470 ms |
11096 KB |
Output is correct |
39 |
Correct |
467 ms |
11040 KB |
Output is correct |
40 |
Correct |
452 ms |
11064 KB |
Output is correct |
41 |
Correct |
466 ms |
11076 KB |
Output is correct |
42 |
Correct |
15 ms |
1748 KB |
Output is correct |
43 |
Correct |
131 ms |
1640 KB |
Output is correct |
44 |
Correct |
7 ms |
1492 KB |
Output is correct |
45 |
Correct |
889 ms |
31520 KB |
Output is correct |
46 |
Correct |
914 ms |
31588 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 |
1012 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 |
980 KB |
Output is correct |
9 |
Correct |
1 ms |
1012 KB |
Output is correct |
10 |
Correct |
2 ms |
1108 KB |
Output is correct |
11 |
Correct |
7 ms |
1236 KB |
Output is correct |
12 |
Correct |
2 ms |
980 KB |
Output is correct |
13 |
Correct |
1 ms |
1016 KB |
Output is correct |
14 |
Correct |
7 ms |
1384 KB |
Output is correct |
15 |
Correct |
7 ms |
1396 KB |
Output is correct |
16 |
Correct |
1 ms |
1016 KB |
Output is correct |
17 |
Correct |
12 ms |
1876 KB |
Output is correct |
18 |
Correct |
1 ms |
980 KB |
Output is correct |
19 |
Correct |
1 ms |
980 KB |
Output is correct |
20 |
Correct |
2 ms |
1108 KB |
Output is correct |
21 |
Correct |
1 ms |
980 KB |
Output is correct |
22 |
Correct |
1 ms |
980 KB |
Output is correct |
23 |
Correct |
3 ms |
1364 KB |
Output is correct |
24 |
Correct |
7 ms |
1808 KB |
Output is correct |
25 |
Correct |
3 ms |
1236 KB |
Output is correct |
26 |
Correct |
4 ms |
1404 KB |
Output is correct |
27 |
Correct |
10 ms |
1460 KB |
Output is correct |
28 |
Correct |
9 ms |
2260 KB |
Output is correct |
29 |
Correct |
28 ms |
4748 KB |
Output is correct |
30 |
Correct |
6 ms |
2112 KB |
Output is correct |
31 |
Correct |
15 ms |
2992 KB |
Output is correct |
32 |
Correct |
9 ms |
2388 KB |
Output is correct |
33 |
Correct |
70 ms |
8436 KB |
Output is correct |
34 |
Correct |
71 ms |
8552 KB |
Output is correct |
35 |
Correct |
219 ms |
7040 KB |
Output is correct |
36 |
Correct |
12 ms |
2004 KB |
Output is correct |
37 |
Correct |
552 ms |
12076 KB |
Output is correct |
38 |
Correct |
457 ms |
11004 KB |
Output is correct |
39 |
Correct |
473 ms |
11084 KB |
Output is correct |
40 |
Correct |
481 ms |
11056 KB |
Output is correct |
41 |
Correct |
451 ms |
11016 KB |
Output is correct |
42 |
Correct |
15 ms |
1748 KB |
Output is correct |
43 |
Correct |
130 ms |
1640 KB |
Output is correct |
44 |
Correct |
7 ms |
1492 KB |
Output is correct |
45 |
Correct |
851 ms |
31432 KB |
Output is correct |
46 |
Correct |
880 ms |
31480 KB |
Output is correct |
47 |
Execution timed out |
1071 ms |
33796 KB |
Time limit exceeded |
48 |
Halted |
0 ms |
0 KB |
- |