#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 = 2e6 + 20;
const int inf = 1e9 + 20;
int B[maxN];
int P[maxN];
vector<int> adj0[maxN];
vector<int> adj1[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) {
adj1[cnt].emplace_back(cnt + 1);
adj1[cnt + 1].emplace_back(cnt);
}
if (cur == B[i]) {
adj0[B[i]].emplace_back(cnt);
}
pos[cnt] = cur;
cnt++;
}
}
}
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) {
adj1[cnt].emplace_back(cnt + 1);
adj1[cnt + 1].emplace_back(cnt);
}
id[cur] = cnt;
pos[cnt] = cur;
cnt++;
}
}
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]]);
}
}
}
assert(cnt < maxC);
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);
}
}
for (auto v: adj1[u]) {
if (dist[u] + 1 < dist[v]) {
dist[v] = dist[u] + 1;
q.push_back(v);
}
}
}
cout << -1;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
32 ms |
55808 KB |
Output is correct |
2 |
Correct |
28 ms |
55760 KB |
Output is correct |
3 |
Correct |
27 ms |
55744 KB |
Output is correct |
4 |
Correct |
29 ms |
55764 KB |
Output is correct |
5 |
Correct |
30 ms |
55804 KB |
Output is correct |
6 |
Correct |
29 ms |
55780 KB |
Output is correct |
7 |
Correct |
27 ms |
55740 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
29 ms |
55728 KB |
Output is correct |
2 |
Correct |
28 ms |
55756 KB |
Output is correct |
3 |
Correct |
29 ms |
55764 KB |
Output is correct |
4 |
Correct |
31 ms |
55840 KB |
Output is correct |
5 |
Correct |
33 ms |
55712 KB |
Output is correct |
6 |
Correct |
31 ms |
55816 KB |
Output is correct |
7 |
Correct |
29 ms |
55764 KB |
Output is correct |
8 |
Correct |
29 ms |
55764 KB |
Output is correct |
9 |
Correct |
29 ms |
55812 KB |
Output is correct |
10 |
Correct |
28 ms |
55872 KB |
Output is correct |
11 |
Correct |
28 ms |
56048 KB |
Output is correct |
12 |
Correct |
28 ms |
55800 KB |
Output is correct |
13 |
Correct |
28 ms |
55764 KB |
Output is correct |
14 |
Correct |
34 ms |
56020 KB |
Output is correct |
15 |
Correct |
29 ms |
56012 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
31 ms |
55824 KB |
Output is correct |
2 |
Correct |
31 ms |
55836 KB |
Output is correct |
3 |
Correct |
30 ms |
55828 KB |
Output is correct |
4 |
Correct |
29 ms |
55820 KB |
Output is correct |
5 |
Correct |
28 ms |
55840 KB |
Output is correct |
6 |
Correct |
29 ms |
55840 KB |
Output is correct |
7 |
Correct |
29 ms |
55780 KB |
Output is correct |
8 |
Correct |
33 ms |
55832 KB |
Output is correct |
9 |
Correct |
28 ms |
55796 KB |
Output is correct |
10 |
Correct |
28 ms |
55900 KB |
Output is correct |
11 |
Correct |
29 ms |
56000 KB |
Output is correct |
12 |
Correct |
29 ms |
55764 KB |
Output is correct |
13 |
Correct |
28 ms |
55748 KB |
Output is correct |
14 |
Correct |
29 ms |
56020 KB |
Output is correct |
15 |
Correct |
30 ms |
56020 KB |
Output is correct |
16 |
Correct |
28 ms |
56020 KB |
Output is correct |
17 |
Correct |
32 ms |
56788 KB |
Output is correct |
18 |
Correct |
32 ms |
57172 KB |
Output is correct |
19 |
Correct |
29 ms |
56564 KB |
Output is correct |
20 |
Correct |
28 ms |
55984 KB |
Output is correct |
21 |
Correct |
29 ms |
55904 KB |
Output is correct |
22 |
Correct |
29 ms |
56548 KB |
Output is correct |
23 |
Correct |
34 ms |
56904 KB |
Output is correct |
24 |
Correct |
36 ms |
57948 KB |
Output is correct |
25 |
Correct |
31 ms |
56228 KB |
Output is correct |
26 |
Correct |
32 ms |
57676 KB |
Output is correct |
27 |
Correct |
30 ms |
56988 KB |
Output is correct |
28 |
Correct |
34 ms |
58320 KB |
Output is correct |
29 |
Correct |
33 ms |
58060 KB |
Output is correct |
30 |
Correct |
29 ms |
56392 KB |
Output is correct |
31 |
Correct |
32 ms |
56988 KB |
Output is correct |
32 |
Correct |
31 ms |
56764 KB |
Output is correct |
33 |
Correct |
46 ms |
60368 KB |
Output is correct |
34 |
Correct |
44 ms |
60244 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
28 ms |
55832 KB |
Output is correct |
2 |
Correct |
27 ms |
55732 KB |
Output is correct |
3 |
Correct |
31 ms |
55712 KB |
Output is correct |
4 |
Correct |
28 ms |
55760 KB |
Output is correct |
5 |
Correct |
28 ms |
55764 KB |
Output is correct |
6 |
Correct |
29 ms |
55840 KB |
Output is correct |
7 |
Correct |
31 ms |
55760 KB |
Output is correct |
8 |
Correct |
30 ms |
55728 KB |
Output is correct |
9 |
Correct |
27 ms |
55816 KB |
Output is correct |
10 |
Correct |
30 ms |
55888 KB |
Output is correct |
11 |
Correct |
29 ms |
56020 KB |
Output is correct |
12 |
Correct |
29 ms |
55816 KB |
Output is correct |
13 |
Correct |
30 ms |
55836 KB |
Output is correct |
14 |
Correct |
29 ms |
56100 KB |
Output is correct |
15 |
Correct |
29 ms |
55980 KB |
Output is correct |
16 |
Correct |
31 ms |
55916 KB |
Output is correct |
17 |
Correct |
31 ms |
56740 KB |
Output is correct |
18 |
Correct |
30 ms |
57064 KB |
Output is correct |
19 |
Correct |
32 ms |
56660 KB |
Output is correct |
20 |
Correct |
28 ms |
56004 KB |
Output is correct |
21 |
Correct |
28 ms |
55892 KB |
Output is correct |
22 |
Correct |
31 ms |
56660 KB |
Output is correct |
23 |
Correct |
32 ms |
56860 KB |
Output is correct |
24 |
Correct |
33 ms |
57940 KB |
Output is correct |
25 |
Correct |
28 ms |
56128 KB |
Output is correct |
26 |
Correct |
33 ms |
57512 KB |
Output is correct |
27 |
Correct |
32 ms |
57072 KB |
Output is correct |
28 |
Correct |
35 ms |
58488 KB |
Output is correct |
29 |
Correct |
37 ms |
58008 KB |
Output is correct |
30 |
Correct |
32 ms |
56432 KB |
Output is correct |
31 |
Correct |
32 ms |
57044 KB |
Output is correct |
32 |
Correct |
31 ms |
56668 KB |
Output is correct |
33 |
Correct |
46 ms |
60272 KB |
Output is correct |
34 |
Correct |
41 ms |
60356 KB |
Output is correct |
35 |
Correct |
49 ms |
60432 KB |
Output is correct |
36 |
Correct |
40 ms |
57284 KB |
Output is correct |
37 |
Correct |
55 ms |
63564 KB |
Output is correct |
38 |
Correct |
65 ms |
63308 KB |
Output is correct |
39 |
Correct |
51 ms |
63244 KB |
Output is correct |
40 |
Correct |
49 ms |
63264 KB |
Output is correct |
41 |
Correct |
52 ms |
63236 KB |
Output is correct |
42 |
Correct |
35 ms |
57688 KB |
Output is correct |
43 |
Correct |
37 ms |
57164 KB |
Output is correct |
44 |
Correct |
38 ms |
56128 KB |
Output is correct |
45 |
Correct |
156 ms |
73484 KB |
Output is correct |
46 |
Correct |
126 ms |
73444 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
29 ms |
55716 KB |
Output is correct |
2 |
Correct |
29 ms |
55696 KB |
Output is correct |
3 |
Correct |
32 ms |
55824 KB |
Output is correct |
4 |
Correct |
29 ms |
55740 KB |
Output is correct |
5 |
Correct |
29 ms |
55824 KB |
Output is correct |
6 |
Correct |
29 ms |
55776 KB |
Output is correct |
7 |
Correct |
29 ms |
55740 KB |
Output is correct |
8 |
Correct |
29 ms |
55764 KB |
Output is correct |
9 |
Correct |
31 ms |
55780 KB |
Output is correct |
10 |
Correct |
28 ms |
55916 KB |
Output is correct |
11 |
Correct |
30 ms |
56020 KB |
Output is correct |
12 |
Correct |
29 ms |
55788 KB |
Output is correct |
13 |
Correct |
29 ms |
55856 KB |
Output is correct |
14 |
Correct |
33 ms |
56084 KB |
Output is correct |
15 |
Correct |
31 ms |
56020 KB |
Output is correct |
16 |
Correct |
37 ms |
56020 KB |
Output is correct |
17 |
Correct |
30 ms |
56864 KB |
Output is correct |
18 |
Correct |
32 ms |
57152 KB |
Output is correct |
19 |
Correct |
30 ms |
56532 KB |
Output is correct |
20 |
Correct |
29 ms |
55884 KB |
Output is correct |
21 |
Correct |
29 ms |
55900 KB |
Output is correct |
22 |
Correct |
35 ms |
56668 KB |
Output is correct |
23 |
Correct |
35 ms |
56944 KB |
Output is correct |
24 |
Correct |
36 ms |
57892 KB |
Output is correct |
25 |
Correct |
30 ms |
56148 KB |
Output is correct |
26 |
Correct |
31 ms |
57508 KB |
Output is correct |
27 |
Correct |
29 ms |
56884 KB |
Output is correct |
28 |
Correct |
35 ms |
58428 KB |
Output is correct |
29 |
Correct |
34 ms |
58100 KB |
Output is correct |
30 |
Correct |
30 ms |
56504 KB |
Output is correct |
31 |
Correct |
31 ms |
57000 KB |
Output is correct |
32 |
Correct |
32 ms |
56652 KB |
Output is correct |
33 |
Correct |
45 ms |
60348 KB |
Output is correct |
34 |
Correct |
40 ms |
60328 KB |
Output is correct |
35 |
Correct |
46 ms |
60364 KB |
Output is correct |
36 |
Correct |
37 ms |
57300 KB |
Output is correct |
37 |
Correct |
53 ms |
63564 KB |
Output is correct |
38 |
Correct |
67 ms |
63196 KB |
Output is correct |
39 |
Correct |
49 ms |
63176 KB |
Output is correct |
40 |
Correct |
51 ms |
63308 KB |
Output is correct |
41 |
Correct |
51 ms |
63340 KB |
Output is correct |
42 |
Correct |
43 ms |
57812 KB |
Output is correct |
43 |
Correct |
46 ms |
57164 KB |
Output is correct |
44 |
Correct |
32 ms |
56148 KB |
Output is correct |
45 |
Correct |
160 ms |
73480 KB |
Output is correct |
46 |
Correct |
114 ms |
73668 KB |
Output is correct |
47 |
Correct |
233 ms |
118288 KB |
Output is correct |
48 |
Runtime error |
255 ms |
240896 KB |
Execution killed with signal 11 |
49 |
Halted |
0 ms |
0 KB |
- |