#include<bits/stdc++.h>
using namespace std;
const int nax = 3e4 + 3;
const int INF = 1e9;
int b[nax], p[nax];
vector<int>doges[nax];
unordered_map<long long,int>dist;
int get(int x, int y) {
long long H = x * 100000LL + y;
if(dist.find(H)!=dist.end()) return dist[H];
return INF;
}
void put(int x, int y, int val) {
long long H = x * 100000LL + y;
dist[H] = val;
}
void PlayGround() {
int n, m;
cin>>n>>m;
for(int i=0; i<m; ++i) {
cin>>b[i]>>p[i];
doges[b[i]].push_back(p[i]);
}
put(b[0], 0, 0);
queue<tuple<int,int,int>>q;
q.push({b[0], 0, 0});
while(!q.empty()) {
auto x = q.front();
q.pop();
int ss, j, d;
tie(ss, j, d) = x;
if(d!=get(ss, j)) continue;
if(j==0) {
for(int z : doges[ss]) {
if(get(ss, z)>d) {
put(ss, z, d);
q.emplace(ss, z, d);
}
}
} else {
if(ss+j<n) {
if(get(ss+j, j)>d+1) {
put(ss+j, j, d+1);
q.emplace(ss+j, j, d+1);
}
if(get(ss+j, 0)>d+1) {
put(ss+j, 0, d+1);
q.emplace(ss+j, 0, d+1);
}
}
if(ss-j>=0) {
if(get(ss-j, j)>d+1) {
put(ss-j, j, d+1);
q.emplace(ss-j, j, d+1);
}
if(get(ss-j, 0)>d+1) {
put(ss-j, 0, d+1);
q.emplace(ss-j, 0, d+1);
}
}
}
}
int ans = get(b[1], 0);
if(ans==INF) ans = -1;
cout<<ans<<'\n';
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
PlayGround();
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
980 KB |
Output is correct |
2 |
Correct |
1 ms |
980 KB |
Output is correct |
3 |
Correct |
1 ms |
980 KB |
Output is correct |
4 |
Correct |
1 ms |
980 KB |
Output is correct |
5 |
Correct |
1 ms |
980 KB |
Output is correct |
6 |
Correct |
1 ms |
980 KB |
Output is correct |
7 |
Correct |
1 ms |
980 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
980 KB |
Output is correct |
2 |
Correct |
1 ms |
980 KB |
Output is correct |
3 |
Correct |
1 ms |
980 KB |
Output is correct |
4 |
Correct |
1 ms |
980 KB |
Output is correct |
5 |
Correct |
1 ms |
980 KB |
Output is correct |
6 |
Correct |
1 ms |
980 KB |
Output is correct |
7 |
Correct |
1 ms |
980 KB |
Output is correct |
8 |
Correct |
1 ms |
968 KB |
Output is correct |
9 |
Correct |
1 ms |
980 KB |
Output is correct |
10 |
Correct |
1 ms |
1108 KB |
Output is correct |
11 |
Correct |
2 ms |
1236 KB |
Output is correct |
12 |
Correct |
1 ms |
980 KB |
Output is correct |
13 |
Correct |
2 ms |
980 KB |
Output is correct |
14 |
Correct |
2 ms |
1236 KB |
Output is correct |
15 |
Correct |
2 ms |
1348 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
980 KB |
Output is correct |
2 |
Correct |
1 ms |
980 KB |
Output is correct |
3 |
Correct |
1 ms |
980 KB |
Output is correct |
4 |
Correct |
1 ms |
980 KB |
Output is correct |
5 |
Correct |
1 ms |
980 KB |
Output is correct |
6 |
Correct |
1 ms |
980 KB |
Output is correct |
7 |
Correct |
1 ms |
980 KB |
Output is correct |
8 |
Correct |
1 ms |
980 KB |
Output is correct |
9 |
Correct |
1 ms |
980 KB |
Output is correct |
10 |
Correct |
1 ms |
1108 KB |
Output is correct |
11 |
Correct |
2 ms |
1208 KB |
Output is correct |
12 |
Correct |
1 ms |
980 KB |
Output is correct |
13 |
Correct |
1 ms |
980 KB |
Output is correct |
14 |
Correct |
2 ms |
1236 KB |
Output is correct |
15 |
Correct |
2 ms |
1236 KB |
Output is correct |
16 |
Correct |
2 ms |
980 KB |
Output is correct |
17 |
Correct |
4 ms |
1620 KB |
Output is correct |
18 |
Correct |
1 ms |
980 KB |
Output is correct |
19 |
Correct |
1 ms |
980 KB |
Output is correct |
20 |
Correct |
2 ms |
1252 KB |
Output is correct |
21 |
Correct |
1 ms |
980 KB |
Output is correct |
22 |
Correct |
1 ms |
980 KB |
Output is correct |
23 |
Correct |
2 ms |
1364 KB |
Output is correct |
24 |
Correct |
4 ms |
1620 KB |
Output is correct |
25 |
Correct |
3 ms |
1364 KB |
Output is correct |
26 |
Correct |
3 ms |
1364 KB |
Output is correct |
27 |
Correct |
2 ms |
1364 KB |
Output is correct |
28 |
Correct |
6 ms |
2184 KB |
Output is correct |
29 |
Correct |
13 ms |
3592 KB |
Output is correct |
30 |
Correct |
4 ms |
1748 KB |
Output is correct |
31 |
Correct |
10 ms |
2480 KB |
Output is correct |
32 |
Correct |
6 ms |
2132 KB |
Output is correct |
33 |
Correct |
26 ms |
6188 KB |
Output is correct |
34 |
Correct |
23 ms |
6136 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
980 KB |
Output is correct |
2 |
Correct |
1 ms |
980 KB |
Output is correct |
3 |
Correct |
1 ms |
980 KB |
Output is correct |
4 |
Correct |
1 ms |
980 KB |
Output is correct |
5 |
Correct |
1 ms |
980 KB |
Output is correct |
6 |
Correct |
1 ms |
980 KB |
Output is correct |
7 |
Correct |
1 ms |
980 KB |
Output is correct |
8 |
Correct |
1 ms |
980 KB |
Output is correct |
9 |
Correct |
1 ms |
980 KB |
Output is correct |
10 |
Correct |
1 ms |
1108 KB |
Output is correct |
11 |
Correct |
2 ms |
1236 KB |
Output is correct |
12 |
Correct |
2 ms |
980 KB |
Output is correct |
13 |
Correct |
1 ms |
980 KB |
Output is correct |
14 |
Correct |
3 ms |
1236 KB |
Output is correct |
15 |
Correct |
2 ms |
1348 KB |
Output is correct |
16 |
Correct |
1 ms |
980 KB |
Output is correct |
17 |
Correct |
4 ms |
1620 KB |
Output is correct |
18 |
Correct |
1 ms |
980 KB |
Output is correct |
19 |
Correct |
1 ms |
980 KB |
Output is correct |
20 |
Correct |
2 ms |
1236 KB |
Output is correct |
21 |
Correct |
1 ms |
980 KB |
Output is correct |
22 |
Correct |
2 ms |
980 KB |
Output is correct |
23 |
Correct |
2 ms |
1364 KB |
Output is correct |
24 |
Correct |
4 ms |
1620 KB |
Output is correct |
25 |
Correct |
3 ms |
1364 KB |
Output is correct |
26 |
Correct |
2 ms |
1364 KB |
Output is correct |
27 |
Correct |
3 ms |
1328 KB |
Output is correct |
28 |
Correct |
5 ms |
2260 KB |
Output is correct |
29 |
Correct |
13 ms |
3608 KB |
Output is correct |
30 |
Correct |
4 ms |
1748 KB |
Output is correct |
31 |
Correct |
8 ms |
2480 KB |
Output is correct |
32 |
Correct |
5 ms |
2132 KB |
Output is correct |
33 |
Correct |
23 ms |
6136 KB |
Output is correct |
34 |
Correct |
24 ms |
6216 KB |
Output is correct |
35 |
Correct |
31 ms |
6152 KB |
Output is correct |
36 |
Correct |
5 ms |
1876 KB |
Output is correct |
37 |
Correct |
66 ms |
10800 KB |
Output is correct |
38 |
Correct |
44 ms |
7812 KB |
Output is correct |
39 |
Correct |
42 ms |
7888 KB |
Output is correct |
40 |
Correct |
60 ms |
7868 KB |
Output is correct |
41 |
Correct |
48 ms |
7796 KB |
Output is correct |
42 |
Correct |
6 ms |
1748 KB |
Output is correct |
43 |
Correct |
6 ms |
1620 KB |
Output is correct |
44 |
Correct |
5 ms |
1492 KB |
Output is correct |
45 |
Correct |
217 ms |
22220 KB |
Output is correct |
46 |
Correct |
200 ms |
22064 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
980 KB |
Output is correct |
2 |
Correct |
1 ms |
980 KB |
Output is correct |
3 |
Correct |
1 ms |
980 KB |
Output is correct |
4 |
Correct |
1 ms |
980 KB |
Output is correct |
5 |
Correct |
1 ms |
980 KB |
Output is correct |
6 |
Correct |
1 ms |
980 KB |
Output is correct |
7 |
Correct |
1 ms |
980 KB |
Output is correct |
8 |
Correct |
1 ms |
980 KB |
Output is correct |
9 |
Correct |
1 ms |
980 KB |
Output is correct |
10 |
Correct |
1 ms |
1108 KB |
Output is correct |
11 |
Correct |
3 ms |
1236 KB |
Output is correct |
12 |
Correct |
1 ms |
980 KB |
Output is correct |
13 |
Correct |
1 ms |
1028 KB |
Output is correct |
14 |
Correct |
2 ms |
1348 KB |
Output is correct |
15 |
Correct |
2 ms |
1236 KB |
Output is correct |
16 |
Correct |
1 ms |
980 KB |
Output is correct |
17 |
Correct |
4 ms |
1724 KB |
Output is correct |
18 |
Correct |
1 ms |
980 KB |
Output is correct |
19 |
Correct |
1 ms |
980 KB |
Output is correct |
20 |
Correct |
2 ms |
1236 KB |
Output is correct |
21 |
Correct |
1 ms |
980 KB |
Output is correct |
22 |
Correct |
1 ms |
980 KB |
Output is correct |
23 |
Correct |
2 ms |
1364 KB |
Output is correct |
24 |
Correct |
4 ms |
1620 KB |
Output is correct |
25 |
Correct |
3 ms |
1364 KB |
Output is correct |
26 |
Correct |
3 ms |
1364 KB |
Output is correct |
27 |
Correct |
2 ms |
1364 KB |
Output is correct |
28 |
Correct |
5 ms |
2260 KB |
Output is correct |
29 |
Correct |
12 ms |
3684 KB |
Output is correct |
30 |
Correct |
4 ms |
1748 KB |
Output is correct |
31 |
Correct |
8 ms |
2388 KB |
Output is correct |
32 |
Correct |
6 ms |
2132 KB |
Output is correct |
33 |
Correct |
24 ms |
6248 KB |
Output is correct |
34 |
Correct |
24 ms |
6160 KB |
Output is correct |
35 |
Correct |
32 ms |
6100 KB |
Output is correct |
36 |
Correct |
5 ms |
1876 KB |
Output is correct |
37 |
Correct |
63 ms |
10780 KB |
Output is correct |
38 |
Correct |
46 ms |
7868 KB |
Output is correct |
39 |
Correct |
44 ms |
7836 KB |
Output is correct |
40 |
Correct |
48 ms |
7912 KB |
Output is correct |
41 |
Correct |
44 ms |
7920 KB |
Output is correct |
42 |
Correct |
6 ms |
1748 KB |
Output is correct |
43 |
Correct |
6 ms |
1748 KB |
Output is correct |
44 |
Correct |
6 ms |
1492 KB |
Output is correct |
45 |
Correct |
200 ms |
22096 KB |
Output is correct |
46 |
Correct |
195 ms |
22072 KB |
Output is correct |
47 |
Correct |
438 ms |
40896 KB |
Output is correct |
48 |
Correct |
8 ms |
1620 KB |
Output is correct |
49 |
Correct |
5 ms |
1620 KB |
Output is correct |
50 |
Correct |
5 ms |
1492 KB |
Output is correct |
51 |
Correct |
159 ms |
15524 KB |
Output is correct |
52 |
Correct |
198 ms |
21268 KB |
Output is correct |
53 |
Correct |
31 ms |
6924 KB |
Output is correct |
54 |
Correct |
4 ms |
2224 KB |
Output is correct |
55 |
Correct |
7 ms |
3248 KB |
Output is correct |
56 |
Correct |
14 ms |
4696 KB |
Output is correct |
57 |
Correct |
206 ms |
21112 KB |
Output is correct |
58 |
Correct |
20 ms |
6000 KB |
Output is correct |
59 |
Correct |
30 ms |
6708 KB |
Output is correct |
60 |
Correct |
41 ms |
7488 KB |
Output is correct |
61 |
Correct |
36 ms |
6968 KB |
Output is correct |
62 |
Correct |
228 ms |
24064 KB |
Output is correct |
63 |
Execution timed out |
1088 ms |
81212 KB |
Time limit exceeded |
64 |
Halted |
0 ms |
0 KB |
- |