#include <bits/stdc++.h>
using namespace std;
#define maxn 30010
#define pii pair<int, int>
int N, M;
priority_queue<pii, vector<pii>, greater<pii>> pq;
const int inf = 987654321;
vector<vector<int>> mov(maxn);
int dist[maxn];
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> N >> M;
int source, sink;
int b, p;
for (int i = 0; i < M; i++) {
cin >> b >> p;
mov[b].push_back(p);
if (i == 0) source = b;
if (i == 1) sink = b;
}
for (int i = 0; i < N-1; i++) {
sort(mov[i].begin(), mov[i].end());
}
fill(dist, dist+maxn, inf);
dist[source] = 0;
pq.push(pii(0, source));
while (pq.size()) {
pii cur = pq.top(); pq.pop();
int spot = cur.second;
int d = cur.first;
if (d > dist[spot]) continue;
if (spot == sink) break;
int prev = -1;
for (int val : mov[spot]) {
if (val == prev) continue;
prev = val;
for (int jp = 1; jp < N; jp++) {
int nx = jp*val + spot;
if (nx >= N) break;
if (d + jp < dist[nx]) {
dist[nx] = d+jp;
pq.push(pii(d+jp, nx));
}
if (binary_search(mov[nx].begin(), mov[nx].end(), val)) break;
}
for (int jp = 1; jp < N; jp++) {
int nx = spot - jp*val;
if (nx < 0) break;
if (nx >= N) break;
if (d + jp < dist[nx]) {
dist[nx] = d+jp;
pq.push(pii(d+jp, nx));
}
if (binary_search(mov[nx].begin(), mov[nx].end(), val)) break;
}
}
}
if (dist[sink] == inf) dist[sink] = -1;
cout << dist[sink] << endl;
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:38:3: warning: 'sink' may be used uninitialized in this function [-Wmaybe-uninitialized]
if (spot == sink) break;
^~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1144 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1296 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1296 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1300 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1356 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1356 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1372 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1436 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1448 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1448 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1448 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1448 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1448 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1448 KB |
Output is correct |
| 8 |
Correct |
2 ms |
1448 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1448 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1504 KB |
Output is correct |
| 11 |
Correct |
3 ms |
1652 KB |
Output is correct |
| 12 |
Correct |
3 ms |
1652 KB |
Output is correct |
| 13 |
Correct |
3 ms |
1652 KB |
Output is correct |
| 14 |
Correct |
3 ms |
1668 KB |
Output is correct |
| 15 |
Correct |
3 ms |
1696 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1696 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1696 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1696 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1696 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1696 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1696 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1696 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1696 KB |
Output is correct |
| 9 |
Correct |
4 ms |
1696 KB |
Output is correct |
| 10 |
Correct |
4 ms |
1696 KB |
Output is correct |
| 11 |
Correct |
4 ms |
1804 KB |
Output is correct |
| 12 |
Correct |
3 ms |
1804 KB |
Output is correct |
| 13 |
Correct |
3 ms |
1804 KB |
Output is correct |
| 14 |
Correct |
3 ms |
1804 KB |
Output is correct |
| 15 |
Correct |
3 ms |
1804 KB |
Output is correct |
| 16 |
Correct |
3 ms |
1804 KB |
Output is correct |
| 17 |
Correct |
4 ms |
1908 KB |
Output is correct |
| 18 |
Correct |
3 ms |
1908 KB |
Output is correct |
| 19 |
Correct |
3 ms |
1908 KB |
Output is correct |
| 20 |
Correct |
4 ms |
1944 KB |
Output is correct |
| 21 |
Correct |
3 ms |
1944 KB |
Output is correct |
| 22 |
Correct |
3 ms |
1944 KB |
Output is correct |
| 23 |
Correct |
3 ms |
1944 KB |
Output is correct |
| 24 |
Correct |
4 ms |
1992 KB |
Output is correct |
| 25 |
Correct |
4 ms |
1992 KB |
Output is correct |
| 26 |
Correct |
3 ms |
1992 KB |
Output is correct |
| 27 |
Correct |
5 ms |
1992 KB |
Output is correct |
| 28 |
Correct |
5 ms |
2064 KB |
Output is correct |
| 29 |
Correct |
5 ms |
2212 KB |
Output is correct |
| 30 |
Correct |
4 ms |
2212 KB |
Output is correct |
| 31 |
Correct |
5 ms |
2212 KB |
Output is correct |
| 32 |
Correct |
5 ms |
2212 KB |
Output is correct |
| 33 |
Correct |
8 ms |
2360 KB |
Output is correct |
| 34 |
Correct |
6 ms |
2372 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 2 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 3 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 4 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 5 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 6 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 7 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 8 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 9 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 10 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 11 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 12 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 13 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 14 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 15 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 16 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 17 |
Correct |
4 ms |
2372 KB |
Output is correct |
| 18 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 19 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 20 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 21 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 22 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 23 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 24 |
Correct |
4 ms |
2372 KB |
Output is correct |
| 25 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 26 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 27 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 28 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 29 |
Correct |
5 ms |
2604 KB |
Output is correct |
| 30 |
Correct |
4 ms |
2604 KB |
Output is correct |
| 31 |
Correct |
4 ms |
2604 KB |
Output is correct |
| 32 |
Correct |
3 ms |
2604 KB |
Output is correct |
| 33 |
Correct |
7 ms |
2656 KB |
Output is correct |
| 34 |
Correct |
5 ms |
2668 KB |
Output is correct |
| 35 |
Correct |
11 ms |
2808 KB |
Output is correct |
| 36 |
Correct |
4 ms |
2808 KB |
Output is correct |
| 37 |
Correct |
11 ms |
3068 KB |
Output is correct |
| 38 |
Correct |
13 ms |
3356 KB |
Output is correct |
| 39 |
Correct |
11 ms |
3492 KB |
Output is correct |
| 40 |
Correct |
11 ms |
3760 KB |
Output is correct |
| 41 |
Correct |
17 ms |
4148 KB |
Output is correct |
| 42 |
Correct |
13 ms |
4376 KB |
Output is correct |
| 43 |
Correct |
13 ms |
4524 KB |
Output is correct |
| 44 |
Correct |
13 ms |
4736 KB |
Output is correct |
| 45 |
Correct |
15 ms |
5312 KB |
Output is correct |
| 46 |
Correct |
13 ms |
5408 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 2 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 3 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 4 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 5 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 6 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 7 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 8 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 9 |
Correct |
4 ms |
5408 KB |
Output is correct |
| 10 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 11 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 12 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 13 |
Correct |
4 ms |
5408 KB |
Output is correct |
| 14 |
Correct |
4 ms |
5408 KB |
Output is correct |
| 15 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 16 |
Correct |
4 ms |
5408 KB |
Output is correct |
| 17 |
Correct |
4 ms |
5408 KB |
Output is correct |
| 18 |
Correct |
4 ms |
5408 KB |
Output is correct |
| 19 |
Correct |
4 ms |
5408 KB |
Output is correct |
| 20 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 21 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 22 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 23 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 24 |
Correct |
4 ms |
5408 KB |
Output is correct |
| 25 |
Correct |
4 ms |
5408 KB |
Output is correct |
| 26 |
Correct |
5 ms |
5408 KB |
Output is correct |
| 27 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 28 |
Correct |
3 ms |
5408 KB |
Output is correct |
| 29 |
Correct |
5 ms |
5408 KB |
Output is correct |
| 30 |
Correct |
4 ms |
5408 KB |
Output is correct |
| 31 |
Correct |
5 ms |
5408 KB |
Output is correct |
| 32 |
Correct |
5 ms |
5408 KB |
Output is correct |
| 33 |
Correct |
8 ms |
5632 KB |
Output is correct |
| 34 |
Correct |
7 ms |
5632 KB |
Output is correct |
| 35 |
Correct |
11 ms |
5676 KB |
Output is correct |
| 36 |
Correct |
4 ms |
5676 KB |
Output is correct |
| 37 |
Correct |
11 ms |
5936 KB |
Output is correct |
| 38 |
Correct |
12 ms |
6256 KB |
Output is correct |
| 39 |
Correct |
11 ms |
6392 KB |
Output is correct |
| 40 |
Correct |
11 ms |
6660 KB |
Output is correct |
| 41 |
Correct |
11 ms |
7048 KB |
Output is correct |
| 42 |
Correct |
8 ms |
7184 KB |
Output is correct |
| 43 |
Correct |
8 ms |
7396 KB |
Output is correct |
| 44 |
Correct |
8 ms |
7604 KB |
Output is correct |
| 45 |
Correct |
18 ms |
8196 KB |
Output is correct |
| 46 |
Correct |
13 ms |
8284 KB |
Output is correct |
| 47 |
Correct |
19 ms |
9004 KB |
Output is correct |
| 48 |
Correct |
10 ms |
9004 KB |
Output is correct |
| 49 |
Correct |
10 ms |
9004 KB |
Output is correct |
| 50 |
Correct |
7 ms |
9004 KB |
Output is correct |
| 51 |
Correct |
24 ms |
10172 KB |
Output is correct |
| 52 |
Correct |
24 ms |
10592 KB |
Output is correct |
| 53 |
Correct |
14 ms |
10592 KB |
Output is correct |
| 54 |
Correct |
4 ms |
10592 KB |
Output is correct |
| 55 |
Correct |
5 ms |
10592 KB |
Output is correct |
| 56 |
Correct |
13 ms |
10784 KB |
Output is correct |
| 57 |
Correct |
5 ms |
10784 KB |
Output is correct |
| 58 |
Correct |
11 ms |
10784 KB |
Output is correct |
| 59 |
Correct |
14 ms |
10784 KB |
Output is correct |
| 60 |
Correct |
11 ms |
10876 KB |
Output is correct |
| 61 |
Correct |
11 ms |
11084 KB |
Output is correct |
| 62 |
Correct |
17 ms |
11972 KB |
Output is correct |
| 63 |
Correct |
50 ms |
13660 KB |
Output is correct |
| 64 |
Correct |
57 ms |
13924 KB |
Output is correct |
| 65 |
Correct |
70 ms |
14152 KB |
Output is correct |
| 66 |
Correct |
163 ms |
16460 KB |
Output is correct |
| 67 |
Correct |
99 ms |
16504 KB |
Output is correct |
