#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int MAXN = 3e4 + 5;
int N, M, B[MAXN], D[MAXN], S, E;
vector<int> V[MAXN];
vector<pii> G[MAXN];
void solve() {
for(int i=0; i<N; i++) D[i] = 1e9;
priority_queue<pii, vector<pii>, greater<pii> > pq;
D[S] = 0;
pq.push(pii(0, S));
while(!pq.empty()) {
int cur = pq.top().se, dis = pq.top().fi; pq.pop();
if(D[cur] < dis) continue;
for(auto nxt : G[cur]) if(dis + nxt.se < D[nxt.fi]) {
D[nxt.fi] = dis + nxt.se;
pq.push(pii(D[nxt.fi], nxt.fi));
}
}
}
int main() {
ios::sync_with_stdio(0); cin.tie(0);
cin >> N >> M;
for(int i=0; i<M; i++) {
int b, p;
cin >> b >> p;
V[p].push_back(b);
if(i == 0) S = b;
if(i == 1) E = b;
}
for(int i=1; i<=30000; i++) {
for(int j : V[i]) B[j] = i;
sort(V[i].begin(), V[i].end());
V[i].erase(unique(V[i].begin(), V[i].end()), V[i].end());
for(int j=0; j<V[i].size(); j++) {
for(int b=V[i][j]+i, dis=1; b<N; b+=i, dis++) {
G[V[i][j]].push_back(pii(b, dis));
if(B[b] == i) break;
}
for(int b=V[i][j]-i, dis=1; b>=0; b-=i, dis++) {
G[V[i][j]].push_back(pii(b, dis));
if(B[b] == i) break;
}
}
}
solve();
if(D[E] == (int)1e9) cout << -1;
else cout << D[E];
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:46:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j=0; j<V[i].size(); j++) {
~^~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1788 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1784 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 10 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 11 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 12 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 13 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 14 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 15 |
Correct |
4 ms |
1784 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 6 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 7 |
Correct |
2 ms |
1784 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 9 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 11 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 12 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 13 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 14 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 15 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 16 |
Correct |
4 ms |
1788 KB |
Output is correct |
| 17 |
Correct |
5 ms |
2040 KB |
Output is correct |
| 18 |
Correct |
4 ms |
1916 KB |
Output is correct |
| 19 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 20 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 21 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 22 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 23 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 24 |
Correct |
5 ms |
1912 KB |
Output is correct |
| 25 |
Correct |
5 ms |
2040 KB |
Output is correct |
| 26 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 27 |
Correct |
4 ms |
1932 KB |
Output is correct |
| 28 |
Correct |
5 ms |
2040 KB |
Output is correct |
| 29 |
Correct |
7 ms |
2552 KB |
Output is correct |
| 30 |
Correct |
5 ms |
2168 KB |
Output is correct |
| 31 |
Correct |
5 ms |
2296 KB |
Output is correct |
| 32 |
Correct |
3 ms |
2168 KB |
Output is correct |
| 33 |
Correct |
10 ms |
3400 KB |
Output is correct |
| 34 |
Correct |
10 ms |
3320 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1756 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1788 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 10 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 11 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 12 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 13 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 14 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 15 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 16 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 17 |
Correct |
5 ms |
2040 KB |
Output is correct |
| 18 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 19 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 20 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 21 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 22 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 23 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 24 |
Correct |
5 ms |
2040 KB |
Output is correct |
| 25 |
Correct |
5 ms |
2040 KB |
Output is correct |
| 26 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 27 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 28 |
Correct |
5 ms |
2040 KB |
Output is correct |
| 29 |
Correct |
7 ms |
2552 KB |
Output is correct |
| 30 |
Correct |
5 ms |
2040 KB |
Output is correct |
| 31 |
Correct |
5 ms |
2168 KB |
Output is correct |
| 32 |
Correct |
5 ms |
2168 KB |
Output is correct |
| 33 |
Correct |
10 ms |
3320 KB |
Output is correct |
| 34 |
Correct |
10 ms |
3320 KB |
Output is correct |
| 35 |
Correct |
14 ms |
3192 KB |
Output is correct |
| 36 |
Correct |
6 ms |
2040 KB |
Output is correct |
| 37 |
Correct |
15 ms |
4220 KB |
Output is correct |
| 38 |
Correct |
18 ms |
4112 KB |
Output is correct |
| 39 |
Correct |
32 ms |
4088 KB |
Output is correct |
| 40 |
Correct |
19 ms |
4088 KB |
Output is correct |
| 41 |
Correct |
17 ms |
4088 KB |
Output is correct |
| 42 |
Correct |
11 ms |
2296 KB |
Output is correct |
| 43 |
Correct |
10 ms |
2168 KB |
Output is correct |
| 44 |
Correct |
9 ms |
2296 KB |
Output is correct |
| 45 |
Correct |
24 ms |
6776 KB |
Output is correct |
| 46 |
Correct |
24 ms |
6904 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 2 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 3 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1784 KB |
Output is correct |
| 11 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 12 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 13 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 14 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 15 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 16 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 17 |
Correct |
5 ms |
2044 KB |
Output is correct |
| 18 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 19 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 20 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 21 |
Correct |
4 ms |
1784 KB |
Output is correct |
| 22 |
Correct |
4 ms |
1656 KB |
Output is correct |
| 23 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 24 |
Correct |
5 ms |
1912 KB |
Output is correct |
| 25 |
Correct |
6 ms |
2040 KB |
Output is correct |
| 26 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 27 |
Correct |
4 ms |
1912 KB |
Output is correct |
| 28 |
Correct |
5 ms |
2040 KB |
Output is correct |
| 29 |
Correct |
7 ms |
2680 KB |
Output is correct |
| 30 |
Correct |
5 ms |
2040 KB |
Output is correct |
| 31 |
Correct |
4 ms |
2296 KB |
Output is correct |
| 32 |
Correct |
5 ms |
2040 KB |
Output is correct |
| 33 |
Correct |
10 ms |
3320 KB |
Output is correct |
| 34 |
Correct |
10 ms |
3320 KB |
Output is correct |
| 35 |
Correct |
14 ms |
3192 KB |
Output is correct |
| 36 |
Correct |
6 ms |
2040 KB |
Output is correct |
| 37 |
Correct |
15 ms |
4216 KB |
Output is correct |
| 38 |
Correct |
17 ms |
4084 KB |
Output is correct |
| 39 |
Correct |
18 ms |
4092 KB |
Output is correct |
| 40 |
Correct |
17 ms |
4088 KB |
Output is correct |
| 41 |
Correct |
18 ms |
4088 KB |
Output is correct |
| 42 |
Correct |
9 ms |
2168 KB |
Output is correct |
| 43 |
Correct |
9 ms |
2296 KB |
Output is correct |
| 44 |
Correct |
10 ms |
2296 KB |
Output is correct |
| 45 |
Correct |
24 ms |
6776 KB |
Output is correct |
| 46 |
Correct |
24 ms |
6904 KB |
Output is correct |
| 47 |
Correct |
43 ms |
11384 KB |
Output is correct |
| 48 |
Correct |
20 ms |
4980 KB |
Output is correct |
| 49 |
Correct |
17 ms |
4088 KB |
Output is correct |
| 50 |
Correct |
14 ms |
3960 KB |
Output is correct |
| 51 |
Correct |
46 ms |
6840 KB |
Output is correct |
| 52 |
Correct |
48 ms |
7164 KB |
Output is correct |
| 53 |
Correct |
22 ms |
4116 KB |
Output is correct |
| 54 |
Correct |
6 ms |
2424 KB |
Output is correct |
| 55 |
Correct |
7 ms |
2804 KB |
Output is correct |
| 56 |
Correct |
16 ms |
3320 KB |
Output is correct |
| 57 |
Correct |
47 ms |
11008 KB |
Output is correct |
| 58 |
Correct |
13 ms |
3060 KB |
Output is correct |
| 59 |
Correct |
15 ms |
3572 KB |
Output is correct |
| 60 |
Correct |
17 ms |
4340 KB |
Output is correct |
| 61 |
Correct |
16 ms |
3700 KB |
Output is correct |
| 62 |
Correct |
28 ms |
7540 KB |
Output is correct |
| 63 |
Correct |
96 ms |
25824 KB |
Output is correct |
| 64 |
Correct |
112 ms |
34156 KB |
Output is correct |
| 65 |
Correct |
143 ms |
44392 KB |
Output is correct |
| 66 |
Correct |
264 ms |
72116 KB |
Output is correct |
| 67 |
Correct |
265 ms |
72148 KB |
Output is correct |
