#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 = 3e6 + 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++;
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) {
adj1[cnt].emplace_back(cnt + 1);
adj1[cnt + 1].emplace_back(cnt);
}
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);
}
}
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 |
42 ms |
83204 KB |
Output is correct |
2 |
Correct |
38 ms |
83104 KB |
Output is correct |
3 |
Correct |
40 ms |
83180 KB |
Output is correct |
4 |
Correct |
40 ms |
83096 KB |
Output is correct |
5 |
Correct |
41 ms |
83152 KB |
Output is correct |
6 |
Correct |
40 ms |
83104 KB |
Output is correct |
7 |
Correct |
46 ms |
83196 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
44 ms |
83112 KB |
Output is correct |
2 |
Correct |
41 ms |
83200 KB |
Output is correct |
3 |
Correct |
43 ms |
83220 KB |
Output is correct |
4 |
Correct |
45 ms |
83196 KB |
Output is correct |
5 |
Correct |
42 ms |
83156 KB |
Output is correct |
6 |
Correct |
41 ms |
83092 KB |
Output is correct |
7 |
Correct |
47 ms |
83148 KB |
Output is correct |
8 |
Correct |
40 ms |
83148 KB |
Output is correct |
9 |
Correct |
40 ms |
83156 KB |
Output is correct |
10 |
Correct |
41 ms |
83260 KB |
Output is correct |
11 |
Correct |
40 ms |
83364 KB |
Output is correct |
12 |
Correct |
46 ms |
83148 KB |
Output is correct |
13 |
Correct |
46 ms |
83156 KB |
Output is correct |
14 |
Correct |
40 ms |
83460 KB |
Output is correct |
15 |
Correct |
41 ms |
83356 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
41 ms |
83212 KB |
Output is correct |
2 |
Correct |
41 ms |
83100 KB |
Output is correct |
3 |
Correct |
39 ms |
83156 KB |
Output is correct |
4 |
Correct |
41 ms |
83120 KB |
Output is correct |
5 |
Correct |
40 ms |
83104 KB |
Output is correct |
6 |
Correct |
40 ms |
83148 KB |
Output is correct |
7 |
Correct |
40 ms |
83156 KB |
Output is correct |
8 |
Correct |
42 ms |
83284 KB |
Output is correct |
9 |
Correct |
40 ms |
83196 KB |
Output is correct |
10 |
Correct |
41 ms |
83248 KB |
Output is correct |
11 |
Correct |
49 ms |
83316 KB |
Output is correct |
12 |
Correct |
43 ms |
83148 KB |
Output is correct |
13 |
Correct |
41 ms |
83184 KB |
Output is correct |
14 |
Correct |
42 ms |
83360 KB |
Output is correct |
15 |
Correct |
40 ms |
83404 KB |
Output is correct |
16 |
Correct |
39 ms |
83412 KB |
Output is correct |
17 |
Correct |
51 ms |
84188 KB |
Output is correct |
18 |
Correct |
46 ms |
84556 KB |
Output is correct |
19 |
Correct |
45 ms |
84044 KB |
Output is correct |
20 |
Correct |
41 ms |
83344 KB |
Output is correct |
21 |
Correct |
40 ms |
83368 KB |
Output is correct |
22 |
Correct |
43 ms |
84044 KB |
Output is correct |
23 |
Correct |
44 ms |
84300 KB |
Output is correct |
24 |
Correct |
48 ms |
85372 KB |
Output is correct |
25 |
Correct |
43 ms |
83600 KB |
Output is correct |
26 |
Correct |
45 ms |
84916 KB |
Output is correct |
27 |
Correct |
44 ms |
84360 KB |
Output is correct |
28 |
Correct |
48 ms |
85788 KB |
Output is correct |
29 |
Correct |
52 ms |
85452 KB |
Output is correct |
30 |
Correct |
41 ms |
83808 KB |
Output is correct |
31 |
Correct |
44 ms |
84472 KB |
Output is correct |
32 |
Correct |
42 ms |
84128 KB |
Output is correct |
33 |
Correct |
55 ms |
87712 KB |
Output is correct |
34 |
Correct |
54 ms |
87640 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
39 ms |
83148 KB |
Output is correct |
2 |
Correct |
40 ms |
83224 KB |
Output is correct |
3 |
Correct |
39 ms |
83148 KB |
Output is correct |
4 |
Correct |
40 ms |
83148 KB |
Output is correct |
5 |
Correct |
39 ms |
83192 KB |
Output is correct |
6 |
Correct |
39 ms |
83144 KB |
Output is correct |
7 |
Correct |
38 ms |
83208 KB |
Output is correct |
8 |
Correct |
39 ms |
83164 KB |
Output is correct |
9 |
Correct |
40 ms |
83236 KB |
Output is correct |
10 |
Correct |
43 ms |
83276 KB |
Output is correct |
11 |
Correct |
41 ms |
83336 KB |
Output is correct |
12 |
Correct |
39 ms |
83148 KB |
Output is correct |
13 |
Correct |
39 ms |
83176 KB |
Output is correct |
14 |
Correct |
42 ms |
83436 KB |
Output is correct |
15 |
Correct |
41 ms |
83444 KB |
Output is correct |
16 |
Correct |
46 ms |
83384 KB |
Output is correct |
17 |
Correct |
44 ms |
84220 KB |
Output is correct |
18 |
Correct |
46 ms |
84452 KB |
Output is correct |
19 |
Correct |
43 ms |
83924 KB |
Output is correct |
20 |
Correct |
41 ms |
83336 KB |
Output is correct |
21 |
Correct |
42 ms |
83404 KB |
Output is correct |
22 |
Correct |
44 ms |
83992 KB |
Output is correct |
23 |
Correct |
48 ms |
84312 KB |
Output is correct |
24 |
Correct |
53 ms |
85408 KB |
Output is correct |
25 |
Correct |
42 ms |
83524 KB |
Output is correct |
26 |
Correct |
52 ms |
85056 KB |
Output is correct |
27 |
Correct |
47 ms |
84368 KB |
Output is correct |
28 |
Correct |
55 ms |
85768 KB |
Output is correct |
29 |
Correct |
53 ms |
85452 KB |
Output is correct |
30 |
Correct |
41 ms |
83820 KB |
Output is correct |
31 |
Correct |
46 ms |
84372 KB |
Output is correct |
32 |
Correct |
44 ms |
84036 KB |
Output is correct |
33 |
Correct |
57 ms |
87668 KB |
Output is correct |
34 |
Correct |
54 ms |
87748 KB |
Output is correct |
35 |
Correct |
58 ms |
87760 KB |
Output is correct |
36 |
Correct |
51 ms |
84732 KB |
Output is correct |
37 |
Correct |
63 ms |
90992 KB |
Output is correct |
38 |
Correct |
64 ms |
90652 KB |
Output is correct |
39 |
Correct |
68 ms |
90628 KB |
Output is correct |
40 |
Correct |
63 ms |
90700 KB |
Output is correct |
41 |
Correct |
63 ms |
90700 KB |
Output is correct |
42 |
Correct |
49 ms |
85068 KB |
Output is correct |
43 |
Correct |
52 ms |
84548 KB |
Output is correct |
44 |
Correct |
49 ms |
83532 KB |
Output is correct |
45 |
Correct |
185 ms |
100944 KB |
Output is correct |
46 |
Correct |
139 ms |
100940 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
40 ms |
83208 KB |
Output is correct |
2 |
Correct |
43 ms |
83144 KB |
Output is correct |
3 |
Correct |
45 ms |
83148 KB |
Output is correct |
4 |
Correct |
45 ms |
83216 KB |
Output is correct |
5 |
Correct |
41 ms |
83100 KB |
Output is correct |
6 |
Correct |
39 ms |
83212 KB |
Output is correct |
7 |
Correct |
41 ms |
83168 KB |
Output is correct |
8 |
Correct |
40 ms |
83144 KB |
Output is correct |
9 |
Correct |
42 ms |
83176 KB |
Output is correct |
10 |
Correct |
42 ms |
83200 KB |
Output is correct |
11 |
Correct |
40 ms |
83348 KB |
Output is correct |
12 |
Correct |
41 ms |
83152 KB |
Output is correct |
13 |
Correct |
40 ms |
83156 KB |
Output is correct |
14 |
Correct |
41 ms |
83412 KB |
Output is correct |
15 |
Correct |
41 ms |
83392 KB |
Output is correct |
16 |
Correct |
43 ms |
83404 KB |
Output is correct |
17 |
Correct |
44 ms |
84180 KB |
Output is correct |
18 |
Correct |
43 ms |
84492 KB |
Output is correct |
19 |
Correct |
42 ms |
83948 KB |
Output is correct |
20 |
Correct |
41 ms |
83280 KB |
Output is correct |
21 |
Correct |
41 ms |
83276 KB |
Output is correct |
22 |
Correct |
42 ms |
84012 KB |
Output is correct |
23 |
Correct |
43 ms |
84304 KB |
Output is correct |
24 |
Correct |
48 ms |
85308 KB |
Output is correct |
25 |
Correct |
43 ms |
83616 KB |
Output is correct |
26 |
Correct |
49 ms |
84880 KB |
Output is correct |
27 |
Correct |
43 ms |
84300 KB |
Output is correct |
28 |
Correct |
52 ms |
85876 KB |
Output is correct |
29 |
Correct |
50 ms |
85444 KB |
Output is correct |
30 |
Correct |
45 ms |
83772 KB |
Output is correct |
31 |
Correct |
48 ms |
84360 KB |
Output is correct |
32 |
Correct |
42 ms |
83972 KB |
Output is correct |
33 |
Correct |
63 ms |
87732 KB |
Output is correct |
34 |
Correct |
52 ms |
87644 KB |
Output is correct |
35 |
Correct |
57 ms |
87772 KB |
Output is correct |
36 |
Correct |
46 ms |
84668 KB |
Output is correct |
37 |
Correct |
68 ms |
91028 KB |
Output is correct |
38 |
Correct |
67 ms |
90612 KB |
Output is correct |
39 |
Correct |
63 ms |
90588 KB |
Output is correct |
40 |
Correct |
65 ms |
90704 KB |
Output is correct |
41 |
Correct |
64 ms |
90696 KB |
Output is correct |
42 |
Correct |
50 ms |
85184 KB |
Output is correct |
43 |
Correct |
46 ms |
84496 KB |
Output is correct |
44 |
Correct |
53 ms |
83576 KB |
Output is correct |
45 |
Correct |
167 ms |
101004 KB |
Output is correct |
46 |
Correct |
124 ms |
100896 KB |
Output is correct |
47 |
Correct |
190 ms |
145712 KB |
Output is correct |
48 |
Correct |
227 ms |
164664 KB |
Output is correct |
49 |
Correct |
191 ms |
148800 KB |
Output is correct |
50 |
Correct |
189 ms |
150344 KB |
Output is correct |
51 |
Incorrect |
283 ms |
177184 KB |
Output isn't correct |
52 |
Halted |
0 ms |
0 KB |
- |