# include <bits/stdc++.h>
# define fi first
# define se second
# define ll long long
using namespace std;
const int sq = 200;
vector<int> dg[30001];
map<ll , int> jp;
int st, js, ed;
int rc[30001];
bool ex[30001];
map<pair<int, int>, int> vis;
ll ch(int a, int b) {
return (1ll * 1e9 * 1ll * a) + (1ll * b);
}
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();
if(vis[make_pair(a, c)]) continue;
vis[make_pair(a, c)] = 1;
rc[a] = min(rc[a], b);
if(a == ed) break;
if(a - c >= 0 && jp[ch(a - c, c)] == 0) {
BFS.push(make_pair(make_pair(a - c, b + 1), c));
jp[ch(a - c, c)] = 1;
}
if(a + c < N && jp[ch(a + c, c)] == 0) {
BFS.push(make_pair(make_pair(a+c, b + 1), c));
jp[ch(a + c, c)] = 1;
}
if(ex[a]) continue;
ex[a] = true;
for(int k=0;k<dg[a].size();k++) {
c = dg[a][k];
if(a - c >= 0 && jp[ch(a - c, c)] == 0) {
BFS.push(make_pair(make_pair(a - c, b + 1), c));
jp[ch(a - c, c)] = 1;
}
if(a + c < N && jp[ch(a + c, c)] == 0) {
BFS.push(make_pair(make_pair(a+c, b + 1), c));
jp[ch(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:62:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
62 | for(int k=0;k<dg[a].size();k++) {
| ~^~~~~~~~~~~~~
skyscraper.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
22 | scanf("%d %d", &N, &M);
| ~~~~~^~~~~~~~~~~~~~~~~
skyscraper.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
27 | scanf("%d %d", &a, &b);
| ~~~~~^~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
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 |
# |
Verdict |
Execution time |
Memory |
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 |
980 KB |
Output is correct |
9 |
Correct |
1 ms |
968 KB |
Output is correct |
10 |
Correct |
1 ms |
980 KB |
Output is correct |
11 |
Correct |
1 ms |
980 KB |
Output is correct |
12 |
Correct |
1 ms |
980 KB |
Output is correct |
13 |
Correct |
1 ms |
980 KB |
Output is correct |
14 |
Correct |
4 ms |
1748 KB |
Output is correct |
15 |
Correct |
1 ms |
1108 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
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 |
980 KB |
Output is correct |
9 |
Correct |
1 ms |
980 KB |
Output is correct |
10 |
Correct |
1 ms |
980 KB |
Output is correct |
11 |
Correct |
1 ms |
980 KB |
Output is correct |
12 |
Correct |
1 ms |
980 KB |
Output is correct |
13 |
Correct |
1 ms |
980 KB |
Output is correct |
14 |
Correct |
4 ms |
1756 KB |
Output is correct |
15 |
Correct |
1 ms |
1108 KB |
Output is correct |
16 |
Correct |
1 ms |
980 KB |
Output is correct |
17 |
Correct |
2 ms |
1320 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 |
1236 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 |
1492 KB |
Output is correct |
24 |
Correct |
5 ms |
1748 KB |
Output is correct |
25 |
Correct |
1 ms |
1108 KB |
Output is correct |
26 |
Correct |
2 ms |
1364 KB |
Output is correct |
27 |
Correct |
3 ms |
1492 KB |
Output is correct |
28 |
Correct |
12 ms |
3336 KB |
Output is correct |
29 |
Correct |
57 ms |
8688 KB |
Output is correct |
30 |
Correct |
10 ms |
3012 KB |
Output is correct |
31 |
Correct |
23 ms |
5076 KB |
Output is correct |
32 |
Correct |
15 ms |
3876 KB |
Output is correct |
33 |
Correct |
118 ms |
15960 KB |
Output is correct |
34 |
Correct |
52 ms |
8908 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
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 |
980 KB |
Output is correct |
9 |
Correct |
1 ms |
980 KB |
Output is correct |
10 |
Correct |
1 ms |
980 KB |
Output is correct |
11 |
Correct |
1 ms |
980 KB |
Output is correct |
12 |
Correct |
1 ms |
980 KB |
Output is correct |
13 |
Correct |
1 ms |
980 KB |
Output is correct |
14 |
Correct |
4 ms |
1748 KB |
Output is correct |
15 |
Correct |
1 ms |
1108 KB |
Output is correct |
16 |
Correct |
1 ms |
980 KB |
Output is correct |
17 |
Correct |
2 ms |
1364 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 |
1316 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 |
1492 KB |
Output is correct |
24 |
Correct |
4 ms |
1748 KB |
Output is correct |
25 |
Correct |
1 ms |
1108 KB |
Output is correct |
26 |
Correct |
2 ms |
1336 KB |
Output is correct |
27 |
Correct |
3 ms |
1492 KB |
Output is correct |
28 |
Correct |
12 ms |
3384 KB |
Output is correct |
29 |
Correct |
47 ms |
8632 KB |
Output is correct |
30 |
Correct |
11 ms |
3104 KB |
Output is correct |
31 |
Correct |
22 ms |
5076 KB |
Output is correct |
32 |
Correct |
15 ms |
3924 KB |
Output is correct |
33 |
Correct |
151 ms |
15928 KB |
Output is correct |
34 |
Correct |
53 ms |
8880 KB |
Output is correct |
35 |
Correct |
17 ms |
3760 KB |
Output is correct |
36 |
Correct |
2 ms |
1144 KB |
Output is correct |
37 |
Correct |
10 ms |
2772 KB |
Output is correct |
38 |
Correct |
14 ms |
3372 KB |
Output is correct |
39 |
Correct |
5 ms |
1256 KB |
Output is correct |
40 |
Correct |
5 ms |
1236 KB |
Output is correct |
41 |
Correct |
7 ms |
1620 KB |
Output is correct |
42 |
Correct |
5 ms |
1492 KB |
Output is correct |
43 |
Correct |
6 ms |
1620 KB |
Output is correct |
44 |
Correct |
7 ms |
1460 KB |
Output is correct |
45 |
Correct |
805 ms |
61372 KB |
Output is correct |
46 |
Correct |
352 ms |
33512 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
980 KB |
Output is correct |
2 |
Correct |
1 ms |
980 KB |
Output is correct |
3 |
Correct |
1 ms |
940 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 |
980 KB |
Output is correct |
9 |
Correct |
1 ms |
980 KB |
Output is correct |
10 |
Correct |
1 ms |
980 KB |
Output is correct |
11 |
Correct |
1 ms |
980 KB |
Output is correct |
12 |
Correct |
1 ms |
980 KB |
Output is correct |
13 |
Correct |
1 ms |
980 KB |
Output is correct |
14 |
Correct |
4 ms |
1748 KB |
Output is correct |
15 |
Correct |
1 ms |
1108 KB |
Output is correct |
16 |
Correct |
1 ms |
980 KB |
Output is correct |
17 |
Correct |
2 ms |
1364 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 |
1236 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 |
1492 KB |
Output is correct |
24 |
Correct |
5 ms |
1748 KB |
Output is correct |
25 |
Correct |
1 ms |
1108 KB |
Output is correct |
26 |
Correct |
2 ms |
1364 KB |
Output is correct |
27 |
Correct |
3 ms |
1492 KB |
Output is correct |
28 |
Correct |
12 ms |
3412 KB |
Output is correct |
29 |
Correct |
47 ms |
8500 KB |
Output is correct |
30 |
Correct |
10 ms |
3000 KB |
Output is correct |
31 |
Correct |
22 ms |
5104 KB |
Output is correct |
32 |
Correct |
15 ms |
3860 KB |
Output is correct |
33 |
Correct |
119 ms |
16004 KB |
Output is correct |
34 |
Correct |
51 ms |
8912 KB |
Output is correct |
35 |
Correct |
16 ms |
3864 KB |
Output is correct |
36 |
Correct |
2 ms |
1108 KB |
Output is correct |
37 |
Correct |
10 ms |
2712 KB |
Output is correct |
38 |
Correct |
15 ms |
3476 KB |
Output is correct |
39 |
Correct |
5 ms |
1236 KB |
Output is correct |
40 |
Correct |
6 ms |
1236 KB |
Output is correct |
41 |
Correct |
7 ms |
1620 KB |
Output is correct |
42 |
Correct |
5 ms |
1492 KB |
Output is correct |
43 |
Correct |
6 ms |
1620 KB |
Output is correct |
44 |
Correct |
8 ms |
1464 KB |
Output is correct |
45 |
Correct |
771 ms |
61380 KB |
Output is correct |
46 |
Correct |
340 ms |
33508 KB |
Output is correct |
47 |
Correct |
10 ms |
2620 KB |
Output is correct |
48 |
Correct |
7 ms |
1748 KB |
Output is correct |
49 |
Correct |
5 ms |
1748 KB |
Output is correct |
50 |
Correct |
4 ms |
1620 KB |
Output is correct |
51 |
Correct |
38 ms |
7152 KB |
Output is correct |
52 |
Correct |
47 ms |
8420 KB |
Output is correct |
53 |
Correct |
10 ms |
2388 KB |
Output is correct |
54 |
Correct |
7 ms |
2904 KB |
Output is correct |
55 |
Correct |
14 ms |
4180 KB |
Output is correct |
56 |
Correct |
25 ms |
5732 KB |
Output is correct |
57 |
Correct |
2 ms |
1236 KB |
Output is correct |
58 |
Correct |
44 ms |
9708 KB |
Output is correct |
59 |
Correct |
39 ms |
8700 KB |
Output is correct |
60 |
Correct |
39 ms |
8532 KB |
Output is correct |
61 |
Correct |
37 ms |
7916 KB |
Output is correct |
62 |
Correct |
559 ms |
56332 KB |
Output is correct |
63 |
Execution timed out |
1097 ms |
87064 KB |
Time limit exceeded |
64 |
Halted |
0 ms |
0 KB |
- |