#include <bits/stdc++.h>
using namespace std;
void just_do_it();
int main() {
#ifdef KAMIRULEZ
freopen("kamirulez.inp", "r", stdin);
freopen("kamirulez.out", "w", stdout);
#endif
ios_base::sync_with_stdio(0);
cin.tie(0);
just_do_it();
return 0;
}
const int maxN = 3e4 + 20;
const int maxC = 4e6 + 20;
const int inf = 1e9 + 20;
int B[maxN];
int P[maxN];
vector<int> adj0[maxN];
bool can_nxt[maxC];
bool can_prv[maxC];
int dist[maxC];
int pos[maxC];
bool flag[maxN];
int id[maxN];
void just_do_it() {
fill_n(pos, maxC, -1);
int N, M;
cin >> N >> M;
const int lim = sqrt(N);
int cnt = N;
for (int i = 0; i < M; i++) {
cin >> B[i] >> P[i];
if (P[i] > lim) {
int cur = B[i] % P[i];
int nxt = cur + P[i];
for (; cur < N; cur += P[i], nxt += P[i]) {
if (nxt < N) {
can_nxt[cnt] = true;
can_prv[cnt + 1] = true;
}
if (cur == B[i]) {
adj0[B[i]].emplace_back(cnt);
}
pos[cnt] = cur;
cnt++;
if (cnt == maxC) {
exit(0);
}
}
}
}
for (int d = 1; d <= lim; d++) {
for (int i = 0; i < N; i++) {
flag[i] = false;
}
bool found = false;
for (int i = 0; i < M; i++) {
if (P[i] == d) {
found = true;
break;
}
}
if (!found) {
continue;
}
for (int i = 0; i < d; i++) {
int cur = i;
int nxt = cur + d;
for (; cur < N; cur += d, nxt += d) {
if (nxt < N) {
can_nxt[cnt] = true;
can_prv[cnt + 1] = true;
}
id[cur] = cnt;
pos[cnt] = cur;
cnt++;
if (cnt == maxC) {
exit(0);
}
}
}
for (int i = 0; i < M; i++) {
if (P[i] == d && !flag[B[i]]) {
flag[B[i]] = true;
adj0[B[i]].emplace_back(id[B[i]]);
}
}
}
for (int i = 0; i < cnt; i++) {
dist[i] = inf;
}
dist[B[0]] = 0;
deque<int> q = {B[0]};
while (!q.empty()) {
int u = q.front();
if (u == B[1]) {
cout << dist[u];
return;
}
q.pop_front();
if (u < N) {
for (auto v: adj0[u]) {
if (dist[u] < dist[v]) {
dist[v] = dist[u];
q.push_front(v);
}
}
}
else {
if (pos[u] != -1) {
int v = pos[u];
if (dist[u] < dist[v]) {
dist[v] = dist[u];
q.push_front(v);
}
}
if (can_nxt[u]) {
int v = u + 1;
if (dist[u] + 1 < dist[v]) {
dist[v] = dist[u] + 1;
q.push_back(v);
}
}
if (can_prv[u]) {
int v = u - 1;
if (dist[u] + 1 < dist[v]) {
dist[v] = dist[u] + 1;
q.push_back(v);
}
}
}
}
cout << -1;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
16596 KB |
Output is correct |
2 |
Correct |
8 ms |
16596 KB |
Output is correct |
3 |
Correct |
7 ms |
16596 KB |
Output is correct |
4 |
Correct |
7 ms |
16596 KB |
Output is correct |
5 |
Correct |
8 ms |
16724 KB |
Output is correct |
6 |
Correct |
8 ms |
16596 KB |
Output is correct |
7 |
Correct |
7 ms |
16608 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
16596 KB |
Output is correct |
2 |
Correct |
7 ms |
16596 KB |
Output is correct |
3 |
Correct |
7 ms |
16712 KB |
Output is correct |
4 |
Correct |
8 ms |
16688 KB |
Output is correct |
5 |
Correct |
7 ms |
16596 KB |
Output is correct |
6 |
Correct |
7 ms |
16624 KB |
Output is correct |
7 |
Correct |
9 ms |
16596 KB |
Output is correct |
8 |
Correct |
7 ms |
16584 KB |
Output is correct |
9 |
Correct |
7 ms |
16696 KB |
Output is correct |
10 |
Correct |
7 ms |
16724 KB |
Output is correct |
11 |
Correct |
7 ms |
16724 KB |
Output is correct |
12 |
Correct |
8 ms |
16672 KB |
Output is correct |
13 |
Correct |
7 ms |
16724 KB |
Output is correct |
14 |
Correct |
8 ms |
16724 KB |
Output is correct |
15 |
Correct |
8 ms |
16724 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
16596 KB |
Output is correct |
2 |
Correct |
7 ms |
16576 KB |
Output is correct |
3 |
Correct |
7 ms |
16596 KB |
Output is correct |
4 |
Correct |
7 ms |
16596 KB |
Output is correct |
5 |
Correct |
7 ms |
16724 KB |
Output is correct |
6 |
Correct |
7 ms |
16648 KB |
Output is correct |
7 |
Correct |
8 ms |
16596 KB |
Output is correct |
8 |
Correct |
8 ms |
16596 KB |
Output is correct |
9 |
Correct |
8 ms |
16680 KB |
Output is correct |
10 |
Correct |
8 ms |
16676 KB |
Output is correct |
11 |
Correct |
7 ms |
16724 KB |
Output is correct |
12 |
Correct |
8 ms |
16724 KB |
Output is correct |
13 |
Correct |
8 ms |
16648 KB |
Output is correct |
14 |
Correct |
7 ms |
16748 KB |
Output is correct |
15 |
Correct |
8 ms |
16836 KB |
Output is correct |
16 |
Correct |
8 ms |
16740 KB |
Output is correct |
17 |
Correct |
8 ms |
16904 KB |
Output is correct |
18 |
Correct |
8 ms |
16980 KB |
Output is correct |
19 |
Correct |
8 ms |
16852 KB |
Output is correct |
20 |
Correct |
9 ms |
16724 KB |
Output is correct |
21 |
Correct |
8 ms |
16764 KB |
Output is correct |
22 |
Correct |
9 ms |
16852 KB |
Output is correct |
23 |
Correct |
8 ms |
16852 KB |
Output is correct |
24 |
Correct |
8 ms |
17128 KB |
Output is correct |
25 |
Correct |
8 ms |
16724 KB |
Output is correct |
26 |
Correct |
9 ms |
17196 KB |
Output is correct |
27 |
Correct |
8 ms |
16852 KB |
Output is correct |
28 |
Correct |
8 ms |
17236 KB |
Output is correct |
29 |
Correct |
8 ms |
17108 KB |
Output is correct |
30 |
Correct |
8 ms |
16852 KB |
Output is correct |
31 |
Correct |
8 ms |
16912 KB |
Output is correct |
32 |
Correct |
8 ms |
16852 KB |
Output is correct |
33 |
Correct |
10 ms |
17448 KB |
Output is correct |
34 |
Correct |
9 ms |
17492 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
16596 KB |
Output is correct |
2 |
Correct |
8 ms |
16696 KB |
Output is correct |
3 |
Correct |
8 ms |
16596 KB |
Output is correct |
4 |
Correct |
8 ms |
16688 KB |
Output is correct |
5 |
Correct |
7 ms |
16596 KB |
Output is correct |
6 |
Correct |
8 ms |
16596 KB |
Output is correct |
7 |
Correct |
8 ms |
16596 KB |
Output is correct |
8 |
Correct |
8 ms |
16596 KB |
Output is correct |
9 |
Correct |
10 ms |
16668 KB |
Output is correct |
10 |
Correct |
8 ms |
16732 KB |
Output is correct |
11 |
Correct |
8 ms |
16724 KB |
Output is correct |
12 |
Correct |
9 ms |
16724 KB |
Output is correct |
13 |
Correct |
8 ms |
16724 KB |
Output is correct |
14 |
Correct |
8 ms |
16724 KB |
Output is correct |
15 |
Correct |
8 ms |
16724 KB |
Output is correct |
16 |
Correct |
8 ms |
16696 KB |
Output is correct |
17 |
Correct |
9 ms |
16980 KB |
Output is correct |
18 |
Correct |
8 ms |
16980 KB |
Output is correct |
19 |
Correct |
8 ms |
16852 KB |
Output is correct |
20 |
Correct |
8 ms |
16724 KB |
Output is correct |
21 |
Correct |
7 ms |
16724 KB |
Output is correct |
22 |
Correct |
8 ms |
16852 KB |
Output is correct |
23 |
Correct |
9 ms |
16872 KB |
Output is correct |
24 |
Correct |
9 ms |
17108 KB |
Output is correct |
25 |
Correct |
8 ms |
16852 KB |
Output is correct |
26 |
Correct |
8 ms |
16980 KB |
Output is correct |
27 |
Correct |
8 ms |
16852 KB |
Output is correct |
28 |
Correct |
8 ms |
17236 KB |
Output is correct |
29 |
Correct |
9 ms |
17108 KB |
Output is correct |
30 |
Correct |
8 ms |
16832 KB |
Output is correct |
31 |
Correct |
7 ms |
16852 KB |
Output is correct |
32 |
Correct |
8 ms |
16804 KB |
Output is correct |
33 |
Correct |
10 ms |
17492 KB |
Output is correct |
34 |
Correct |
9 ms |
17492 KB |
Output is correct |
35 |
Correct |
14 ms |
17936 KB |
Output is correct |
36 |
Correct |
8 ms |
16988 KB |
Output is correct |
37 |
Correct |
15 ms |
18388 KB |
Output is correct |
38 |
Correct |
14 ms |
18336 KB |
Output is correct |
39 |
Correct |
14 ms |
18388 KB |
Output is correct |
40 |
Correct |
15 ms |
18308 KB |
Output is correct |
41 |
Correct |
14 ms |
18388 KB |
Output is correct |
42 |
Correct |
13 ms |
17192 KB |
Output is correct |
43 |
Correct |
12 ms |
17108 KB |
Output is correct |
44 |
Correct |
11 ms |
16980 KB |
Output is correct |
45 |
Correct |
22 ms |
20104 KB |
Output is correct |
46 |
Correct |
20 ms |
20052 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
16596 KB |
Output is correct |
2 |
Correct |
7 ms |
16596 KB |
Output is correct |
3 |
Correct |
7 ms |
16596 KB |
Output is correct |
4 |
Correct |
7 ms |
16596 KB |
Output is correct |
5 |
Correct |
7 ms |
16596 KB |
Output is correct |
6 |
Correct |
7 ms |
16596 KB |
Output is correct |
7 |
Correct |
7 ms |
16596 KB |
Output is correct |
8 |
Correct |
9 ms |
16628 KB |
Output is correct |
9 |
Correct |
9 ms |
16712 KB |
Output is correct |
10 |
Correct |
7 ms |
16736 KB |
Output is correct |
11 |
Correct |
7 ms |
16724 KB |
Output is correct |
12 |
Correct |
8 ms |
16724 KB |
Output is correct |
13 |
Correct |
8 ms |
16724 KB |
Output is correct |
14 |
Correct |
8 ms |
16724 KB |
Output is correct |
15 |
Correct |
9 ms |
16720 KB |
Output is correct |
16 |
Correct |
8 ms |
16724 KB |
Output is correct |
17 |
Correct |
8 ms |
16852 KB |
Output is correct |
18 |
Correct |
8 ms |
16980 KB |
Output is correct |
19 |
Correct |
8 ms |
16852 KB |
Output is correct |
20 |
Correct |
8 ms |
16748 KB |
Output is correct |
21 |
Correct |
8 ms |
16700 KB |
Output is correct |
22 |
Correct |
8 ms |
16852 KB |
Output is correct |
23 |
Correct |
9 ms |
16852 KB |
Output is correct |
24 |
Correct |
8 ms |
17092 KB |
Output is correct |
25 |
Correct |
8 ms |
16852 KB |
Output is correct |
26 |
Correct |
8 ms |
16940 KB |
Output is correct |
27 |
Correct |
7 ms |
16852 KB |
Output is correct |
28 |
Correct |
8 ms |
17236 KB |
Output is correct |
29 |
Correct |
8 ms |
17128 KB |
Output is correct |
30 |
Correct |
8 ms |
16852 KB |
Output is correct |
31 |
Correct |
9 ms |
16852 KB |
Output is correct |
32 |
Correct |
8 ms |
16812 KB |
Output is correct |
33 |
Correct |
9 ms |
17492 KB |
Output is correct |
34 |
Correct |
9 ms |
17492 KB |
Output is correct |
35 |
Correct |
13 ms |
17876 KB |
Output is correct |
36 |
Correct |
9 ms |
16980 KB |
Output is correct |
37 |
Correct |
13 ms |
18300 KB |
Output is correct |
38 |
Correct |
15 ms |
18368 KB |
Output is correct |
39 |
Correct |
14 ms |
18284 KB |
Output is correct |
40 |
Correct |
15 ms |
18360 KB |
Output is correct |
41 |
Correct |
15 ms |
18416 KB |
Output is correct |
42 |
Correct |
11 ms |
17172 KB |
Output is correct |
43 |
Correct |
11 ms |
17124 KB |
Output is correct |
44 |
Correct |
11 ms |
16992 KB |
Output is correct |
45 |
Correct |
21 ms |
20032 KB |
Output is correct |
46 |
Correct |
17 ms |
20108 KB |
Output is correct |
47 |
Correct |
24 ms |
27692 KB |
Output is correct |
48 |
Correct |
25 ms |
30988 KB |
Output is correct |
49 |
Correct |
22 ms |
28324 KB |
Output is correct |
50 |
Correct |
20 ms |
28448 KB |
Output is correct |
51 |
Correct |
34 ms |
37888 KB |
Output is correct |
52 |
Correct |
36 ms |
40368 KB |
Output is correct |
53 |
Correct |
16 ms |
18516 KB |
Output is correct |
54 |
Correct |
7 ms |
17108 KB |
Output is correct |
55 |
Correct |
8 ms |
17492 KB |
Output is correct |
56 |
Correct |
15 ms |
18268 KB |
Output is correct |
57 |
Correct |
12 ms |
19596 KB |
Output is correct |
58 |
Correct |
17 ms |
19480 KB |
Output is correct |
59 |
Correct |
17 ms |
22920 KB |
Output is correct |
60 |
Correct |
28 ms |
32772 KB |
Output is correct |
61 |
Correct |
18 ms |
24500 KB |
Output is correct |
62 |
Correct |
34 ms |
33616 KB |
Output is correct |
63 |
Correct |
99 ms |
30936 KB |
Output is correct |
64 |
Correct |
120 ms |
33856 KB |
Output is correct |
65 |
Incorrect |
36 ms |
24880 KB |
Output isn't correct |
66 |
Halted |
0 ms |
0 KB |
- |