#include <iostream>
#include <iomanip>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <cassert>
#include <string>
#include <set>
#include <map>
#include <random>
#include <bitset>
#include <string>
#include <unordered_set>
#include <unordered_map>
#include <deque>
#include <queue>
#define rep(i, n) for (int i = 0; i < (n); i++)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
using namespace std;
using ll = long long;
using ul = unsigned long long;
using ld = long double;
const int N = 30001, M = 7500000;
map<pair<int, int>, vector<int>> li;
vector<int> g[N];
bitset<M> nx, pr;
short num[M];
int d[M];
bitset<M> used;
void adde(int u, int v, bool w) {
g[u].push_back(v * 2 + w);
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(0);
int n, m, cb, cp, s, t;
cin >> n >> m;
rep(i, m) {
cin >> cb >> cp;
if (i == 0)
s = cb;
else if (i == 1)
t = cb;
li[{cp, cb % cp}].push_back(cb);
}
int cs = n;
for (auto &pp : li) {
auto p = pp.first;
int ck = (n - p.second + p.first - 1) / p.first;
rep(i, ck - 1) {
nx[cs + i] = 1;
pr[cs + i + 1] = 1;
}
rep(i, ck)
num[cs + i] = p.second + i * p.first;
for (int i : pp.second)
adde(i, cs + (i - p.second) / p.first, 0);
cs += ck;
assert(cs < M);
}
deque<int> q {s};
rep(i, cs)
d[i] = M;
d[s] = 0;
while (!q.empty()) {
int v = q.front();
q.pop_front();
if (used[v])
continue;
used[v] = 1;
if (v < n)
for (int p : g[v]) {
int u = p / 2;
if (p % 2) {
if (d[u] > d[v] + 1) {
d[u] = d[v] + 1;
q.push_back(u);
}
}
else if (d[u] > d[v]) {
d[u] = d[v];
q.push_front(u);
}
}
else {
if (nx[v] && d[v + 1] > d[v] + 1) {
d[v + 1] = d[v] + 1;
q.push_back(v + 1);
}
if (pr[v] && d[v - 1] > d[v] + 1) {
d[v - 1] = d[v] + 1;
q.push_back(v - 1);
}
if (d[num[v]] > d[v]) {
d[num[v]] = d[v];
q.push_front(num[v]);
}
}
}
if (d[t] == M)
cout << -1;
else
cout << d[t];
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:106:12: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
if (d[t] == M)
~~~^
skyscraper.cpp:70:10: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
d[s] = 0;
~~~~~^~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1024 KB |
Output is correct |
2 |
Correct |
1 ms |
1024 KB |
Output is correct |
3 |
Correct |
1 ms |
1024 KB |
Output is correct |
4 |
Correct |
1 ms |
1024 KB |
Output is correct |
5 |
Correct |
1 ms |
1024 KB |
Output is correct |
6 |
Correct |
1 ms |
1024 KB |
Output is correct |
7 |
Correct |
1 ms |
1024 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1152 KB |
Output is correct |
2 |
Correct |
1 ms |
1024 KB |
Output is correct |
3 |
Correct |
1 ms |
1024 KB |
Output is correct |
4 |
Correct |
1 ms |
1024 KB |
Output is correct |
5 |
Correct |
1 ms |
1024 KB |
Output is correct |
6 |
Correct |
1 ms |
1024 KB |
Output is correct |
7 |
Correct |
1 ms |
1024 KB |
Output is correct |
8 |
Correct |
1 ms |
1024 KB |
Output is correct |
9 |
Correct |
1 ms |
1024 KB |
Output is correct |
10 |
Correct |
1 ms |
1152 KB |
Output is correct |
11 |
Correct |
2 ms |
1280 KB |
Output is correct |
12 |
Correct |
1 ms |
1152 KB |
Output is correct |
13 |
Correct |
1 ms |
1152 KB |
Output is correct |
14 |
Correct |
2 ms |
1408 KB |
Output is correct |
15 |
Correct |
2 ms |
1408 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1024 KB |
Output is correct |
2 |
Correct |
1 ms |
1024 KB |
Output is correct |
3 |
Correct |
1 ms |
1024 KB |
Output is correct |
4 |
Correct |
1 ms |
1024 KB |
Output is correct |
5 |
Correct |
1 ms |
1024 KB |
Output is correct |
6 |
Correct |
1 ms |
1024 KB |
Output is correct |
7 |
Correct |
1 ms |
1024 KB |
Output is correct |
8 |
Correct |
1 ms |
1024 KB |
Output is correct |
9 |
Correct |
1 ms |
1024 KB |
Output is correct |
10 |
Correct |
1 ms |
1152 KB |
Output is correct |
11 |
Correct |
2 ms |
1280 KB |
Output is correct |
12 |
Correct |
1 ms |
1152 KB |
Output is correct |
13 |
Correct |
1 ms |
1152 KB |
Output is correct |
14 |
Correct |
2 ms |
1408 KB |
Output is correct |
15 |
Correct |
2 ms |
1408 KB |
Output is correct |
16 |
Correct |
2 ms |
1152 KB |
Output is correct |
17 |
Correct |
2 ms |
1408 KB |
Output is correct |
18 |
Correct |
2 ms |
1280 KB |
Output is correct |
19 |
Correct |
1 ms |
1152 KB |
Output is correct |
20 |
Correct |
1 ms |
1152 KB |
Output is correct |
21 |
Correct |
1 ms |
1280 KB |
Output is correct |
22 |
Correct |
1 ms |
1152 KB |
Output is correct |
23 |
Correct |
1 ms |
1280 KB |
Output is correct |
24 |
Correct |
2 ms |
1408 KB |
Output is correct |
25 |
Correct |
2 ms |
1408 KB |
Output is correct |
26 |
Correct |
1 ms |
1152 KB |
Output is correct |
27 |
Correct |
1 ms |
1152 KB |
Output is correct |
28 |
Correct |
3 ms |
1536 KB |
Output is correct |
29 |
Correct |
2 ms |
1536 KB |
Output is correct |
30 |
Correct |
1 ms |
1152 KB |
Output is correct |
31 |
Correct |
3 ms |
1536 KB |
Output is correct |
32 |
Correct |
2 ms |
1280 KB |
Output is correct |
33 |
Correct |
4 ms |
2048 KB |
Output is correct |
34 |
Correct |
4 ms |
2048 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1024 KB |
Output is correct |
2 |
Correct |
1 ms |
1024 KB |
Output is correct |
3 |
Correct |
1 ms |
1024 KB |
Output is correct |
4 |
Correct |
1 ms |
1024 KB |
Output is correct |
5 |
Correct |
1 ms |
1024 KB |
Output is correct |
6 |
Correct |
1 ms |
1024 KB |
Output is correct |
7 |
Correct |
1 ms |
1024 KB |
Output is correct |
8 |
Correct |
1 ms |
1024 KB |
Output is correct |
9 |
Correct |
1 ms |
1024 KB |
Output is correct |
10 |
Correct |
1 ms |
1152 KB |
Output is correct |
11 |
Correct |
2 ms |
1280 KB |
Output is correct |
12 |
Correct |
1 ms |
1152 KB |
Output is correct |
13 |
Correct |
1 ms |
1152 KB |
Output is correct |
14 |
Correct |
2 ms |
1408 KB |
Output is correct |
15 |
Correct |
2 ms |
1408 KB |
Output is correct |
16 |
Correct |
1 ms |
1152 KB |
Output is correct |
17 |
Correct |
2 ms |
1408 KB |
Output is correct |
18 |
Correct |
1 ms |
1280 KB |
Output is correct |
19 |
Correct |
1 ms |
1152 KB |
Output is correct |
20 |
Correct |
2 ms |
1152 KB |
Output is correct |
21 |
Correct |
1 ms |
1280 KB |
Output is correct |
22 |
Correct |
1 ms |
1152 KB |
Output is correct |
23 |
Correct |
1 ms |
1280 KB |
Output is correct |
24 |
Correct |
2 ms |
1408 KB |
Output is correct |
25 |
Correct |
2 ms |
1408 KB |
Output is correct |
26 |
Correct |
1 ms |
1152 KB |
Output is correct |
27 |
Correct |
2 ms |
1152 KB |
Output is correct |
28 |
Correct |
2 ms |
1536 KB |
Output is correct |
29 |
Correct |
2 ms |
1536 KB |
Output is correct |
30 |
Correct |
1 ms |
1152 KB |
Output is correct |
31 |
Correct |
2 ms |
1408 KB |
Output is correct |
32 |
Correct |
1 ms |
1280 KB |
Output is correct |
33 |
Correct |
4 ms |
2048 KB |
Output is correct |
34 |
Correct |
4 ms |
2048 KB |
Output is correct |
35 |
Correct |
20 ms |
4736 KB |
Output is correct |
36 |
Correct |
5 ms |
1792 KB |
Output is correct |
37 |
Correct |
17 ms |
4480 KB |
Output is correct |
38 |
Correct |
24 ms |
5632 KB |
Output is correct |
39 |
Correct |
24 ms |
5624 KB |
Output is correct |
40 |
Correct |
24 ms |
5632 KB |
Output is correct |
41 |
Correct |
25 ms |
5540 KB |
Output is correct |
42 |
Correct |
6 ms |
1408 KB |
Output is correct |
43 |
Correct |
7 ms |
1536 KB |
Output is correct |
44 |
Correct |
8 ms |
1536 KB |
Output is correct |
45 |
Correct |
34 ms |
7680 KB |
Output is correct |
46 |
Correct |
28 ms |
7680 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
1024 KB |
Output is correct |
2 |
Correct |
1 ms |
1024 KB |
Output is correct |
3 |
Correct |
1 ms |
1024 KB |
Output is correct |
4 |
Correct |
1 ms |
1024 KB |
Output is correct |
5 |
Correct |
1 ms |
1024 KB |
Output is correct |
6 |
Correct |
1 ms |
1024 KB |
Output is correct |
7 |
Correct |
1 ms |
1024 KB |
Output is correct |
8 |
Correct |
1 ms |
1024 KB |
Output is correct |
9 |
Correct |
1 ms |
1024 KB |
Output is correct |
10 |
Correct |
1 ms |
1152 KB |
Output is correct |
11 |
Correct |
2 ms |
1280 KB |
Output is correct |
12 |
Correct |
1 ms |
1152 KB |
Output is correct |
13 |
Correct |
1 ms |
1152 KB |
Output is correct |
14 |
Correct |
2 ms |
1408 KB |
Output is correct |
15 |
Correct |
2 ms |
1408 KB |
Output is correct |
16 |
Correct |
1 ms |
1152 KB |
Output is correct |
17 |
Correct |
2 ms |
1408 KB |
Output is correct |
18 |
Correct |
2 ms |
1280 KB |
Output is correct |
19 |
Correct |
1 ms |
1152 KB |
Output is correct |
20 |
Correct |
1 ms |
1152 KB |
Output is correct |
21 |
Correct |
1 ms |
1280 KB |
Output is correct |
22 |
Correct |
1 ms |
1152 KB |
Output is correct |
23 |
Correct |
1 ms |
1280 KB |
Output is correct |
24 |
Correct |
3 ms |
1408 KB |
Output is correct |
25 |
Correct |
2 ms |
1408 KB |
Output is correct |
26 |
Correct |
1 ms |
1152 KB |
Output is correct |
27 |
Correct |
1 ms |
1152 KB |
Output is correct |
28 |
Correct |
2 ms |
1536 KB |
Output is correct |
29 |
Correct |
2 ms |
1536 KB |
Output is correct |
30 |
Correct |
1 ms |
1152 KB |
Output is correct |
31 |
Correct |
1 ms |
1408 KB |
Output is correct |
32 |
Correct |
2 ms |
1280 KB |
Output is correct |
33 |
Correct |
4 ms |
2048 KB |
Output is correct |
34 |
Correct |
4 ms |
2048 KB |
Output is correct |
35 |
Correct |
20 ms |
4736 KB |
Output is correct |
36 |
Correct |
4 ms |
1792 KB |
Output is correct |
37 |
Correct |
17 ms |
4480 KB |
Output is correct |
38 |
Correct |
25 ms |
5624 KB |
Output is correct |
39 |
Correct |
26 ms |
5632 KB |
Output is correct |
40 |
Correct |
25 ms |
5632 KB |
Output is correct |
41 |
Correct |
24 ms |
5624 KB |
Output is correct |
42 |
Correct |
7 ms |
1508 KB |
Output is correct |
43 |
Correct |
7 ms |
1536 KB |
Output is correct |
44 |
Correct |
6 ms |
1536 KB |
Output is correct |
45 |
Correct |
29 ms |
7680 KB |
Output is correct |
46 |
Correct |
36 ms |
7672 KB |
Output is correct |
47 |
Correct |
40 ms |
8960 KB |
Output is correct |
48 |
Correct |
21 ms |
5496 KB |
Output is correct |
49 |
Correct |
18 ms |
4864 KB |
Output is correct |
50 |
Correct |
13 ms |
4096 KB |
Output is correct |
51 |
Correct |
36 ms |
7032 KB |
Output is correct |
52 |
Correct |
37 ms |
7288 KB |
Output is correct |
53 |
Correct |
29 ms |
5632 KB |
Output is correct |
54 |
Correct |
1 ms |
1408 KB |
Output is correct |
55 |
Correct |
1 ms |
1536 KB |
Output is correct |
56 |
Correct |
11 ms |
2432 KB |
Output is correct |
57 |
Correct |
12 ms |
4076 KB |
Output is correct |
58 |
Correct |
6 ms |
1920 KB |
Output is correct |
59 |
Correct |
9 ms |
2048 KB |
Output is correct |
60 |
Correct |
8 ms |
2304 KB |
Output is correct |
61 |
Correct |
11 ms |
2560 KB |
Output is correct |
62 |
Correct |
37 ms |
8448 KB |
Output is correct |
63 |
Correct |
83 ms |
19192 KB |
Output is correct |
64 |
Correct |
96 ms |
22388 KB |
Output is correct |
65 |
Correct |
146 ms |
30072 KB |
Output is correct |
66 |
Correct |
288 ms |
49912 KB |
Output is correct |
67 |
Correct |
301 ms |
50040 KB |
Output is correct |