#include <bits/stdc++.h>
#pragma GCC optimize ("O2")
#pragma GCC optimize ("unroll-loops")
//#pragma GCC optimize("no-stack-protector,fast-math")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<pii, int> piii;
typedef pair<ll, ll> pll;
#define debug(x) cerr<<#x<<'='<<(x)<<endl;
#define debugp(x) cerr<<#x<<"= {"<<(x.first)<<", "<<(x.second)<<"}"<<endl;
#define debug2(x, y) cerr<<"{"<<#x<<", "<<#y<<"} = {"<<(x)<<", "<<(y)<<"}"<<endl;
#define debugv(v) {cerr<<#v<<" : ";for (auto x:v) cerr<<x<<' ';cerr<<endl;}
#define all(x) x.begin(), x.end()
#define pb push_back
#define kill(x) return cout<<x<<'\n', 0;
const ld eps=1e-7;
const int inf=1000000010;
const ll INF=10000000000000010LL;
const int mod=1000000007;
const int SQ=180, MAXN=180*30000;
int n, m, k, u, v, x, y, t, a, b, ans;
int B[MAXN], P[MAXN];
int dist[MAXN];
bool mark[MAXN];
vector<pii> G[MAXN];
priority_queue<pii, vector<pii>, greater<pii>> pq;
inline void addedge(int v1, int j1, int v2, int j2, int w){
G[v1*SQ+j1].pb({v2*SQ+j2, w});
}
inline void upd(int v, int d){
if (dist[v]>d) pq.push({dist[v]=d, v});
}
int main(){
ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
memset(dist, 63, sizeof(dist));
cin>>n>>m;
/*
for (int i=0; i<n; i++) for (int j=1; j<SQ; j++){
if (i>=j) addedge(i, j, i-j, j, 1);
if (i+j<n) addedge(i, j, i+j, j, 1);
addedge(i, j, i, 0, 0);
}*/
for (int i=0; i<m; i++){
cin>>B[i]>>P[i];
if (P[i]<SQ) G[B[i]*SQ].pb({B[i]*SQ+P[i], 0});
else{
for (int j=1; B[i]-j*P[i]>=0; j++) addedge(B[i], 0, B[i]-P[i]*j, 0, j);
for (int j=1; B[i]+j*P[i]<n; j++) addedge(B[i], 0, B[i]+P[i]*j, 0, j);
}
}
pq.push({dist[B[0]*SQ]=0, B[0]*SQ});
while (pq.size()){
int v=pq.top().second;
pq.pop();
if (mark[v]) continue ;
mark[v]=1;
for (pii p:G[v]) upd(p.first, dist[v]+p.second);
int i=v/SQ, j=v%SQ;
if (i>=j) upd((i-j)*SQ+j, dist[v]+1);
if (i+j<n) upd((i+j)*SQ+j, dist[v]+1);
upd(i*SQ, dist[v]+0);
}
ans=dist[SQ*B[1]];
if (ans>=inf) ans=-1;
cout<<ans<<'\n';
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
83 ms |
148344 KB |
Output is correct |
2 |
Correct |
88 ms |
148344 KB |
Output is correct |
3 |
Correct |
82 ms |
148344 KB |
Output is correct |
4 |
Correct |
88 ms |
148344 KB |
Output is correct |
5 |
Correct |
85 ms |
148344 KB |
Output is correct |
6 |
Correct |
90 ms |
148344 KB |
Output is correct |
7 |
Correct |
87 ms |
148344 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
96 ms |
148344 KB |
Output is correct |
2 |
Correct |
94 ms |
148344 KB |
Output is correct |
3 |
Correct |
83 ms |
148344 KB |
Output is correct |
4 |
Correct |
93 ms |
148344 KB |
Output is correct |
5 |
Correct |
89 ms |
148344 KB |
Output is correct |
6 |
Correct |
86 ms |
148472 KB |
Output is correct |
7 |
Correct |
83 ms |
148344 KB |
Output is correct |
8 |
Correct |
82 ms |
148252 KB |
Output is correct |
9 |
Correct |
85 ms |
148344 KB |
Output is correct |
10 |
Correct |
89 ms |
148392 KB |
Output is correct |
11 |
Correct |
93 ms |
148344 KB |
Output is correct |
12 |
Correct |
87 ms |
148344 KB |
Output is correct |
13 |
Correct |
87 ms |
148528 KB |
Output is correct |
14 |
Correct |
86 ms |
148472 KB |
Output is correct |
15 |
Correct |
89 ms |
148372 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
89 ms |
148344 KB |
Output is correct |
2 |
Correct |
86 ms |
148348 KB |
Output is correct |
3 |
Correct |
86 ms |
148344 KB |
Output is correct |
4 |
Correct |
84 ms |
148348 KB |
Output is correct |
5 |
Correct |
83 ms |
148344 KB |
Output is correct |
6 |
Correct |
95 ms |
148344 KB |
Output is correct |
7 |
Correct |
84 ms |
148344 KB |
Output is correct |
8 |
Correct |
87 ms |
148344 KB |
Output is correct |
9 |
Correct |
83 ms |
148348 KB |
Output is correct |
10 |
Correct |
88 ms |
148344 KB |
Output is correct |
11 |
Correct |
84 ms |
148344 KB |
Output is correct |
12 |
Correct |
86 ms |
148356 KB |
Output is correct |
13 |
Correct |
88 ms |
148344 KB |
Output is correct |
14 |
Correct |
84 ms |
148344 KB |
Output is correct |
15 |
Correct |
85 ms |
148472 KB |
Output is correct |
16 |
Correct |
83 ms |
148344 KB |
Output is correct |
17 |
Correct |
86 ms |
148472 KB |
Output is correct |
18 |
Correct |
91 ms |
148472 KB |
Output is correct |
19 |
Correct |
84 ms |
148344 KB |
Output is correct |
20 |
Correct |
84 ms |
148728 KB |
Output is correct |
21 |
Correct |
87 ms |
148344 KB |
Output is correct |
22 |
Correct |
84 ms |
148344 KB |
Output is correct |
23 |
Correct |
88 ms |
148600 KB |
Output is correct |
24 |
Correct |
85 ms |
148728 KB |
Output is correct |
25 |
Correct |
87 ms |
148728 KB |
Output is correct |
26 |
Correct |
91 ms |
148728 KB |
Output is correct |
27 |
Correct |
84 ms |
148728 KB |
Output is correct |
28 |
Correct |
89 ms |
148728 KB |
Output is correct |
29 |
Correct |
96 ms |
148856 KB |
Output is correct |
30 |
Correct |
95 ms |
148600 KB |
Output is correct |
31 |
Correct |
97 ms |
148728 KB |
Output is correct |
32 |
Correct |
86 ms |
148728 KB |
Output is correct |
33 |
Correct |
98 ms |
148728 KB |
Output is correct |
34 |
Correct |
98 ms |
148728 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
85 ms |
148344 KB |
Output is correct |
2 |
Correct |
83 ms |
148348 KB |
Output is correct |
3 |
Correct |
84 ms |
148344 KB |
Output is correct |
4 |
Correct |
87 ms |
148344 KB |
Output is correct |
5 |
Correct |
84 ms |
148344 KB |
Output is correct |
6 |
Correct |
82 ms |
148344 KB |
Output is correct |
7 |
Correct |
84 ms |
148472 KB |
Output is correct |
8 |
Correct |
86 ms |
148344 KB |
Output is correct |
9 |
Correct |
84 ms |
148360 KB |
Output is correct |
10 |
Correct |
85 ms |
148472 KB |
Output is correct |
11 |
Correct |
83 ms |
148344 KB |
Output is correct |
12 |
Correct |
83 ms |
148344 KB |
Output is correct |
13 |
Correct |
85 ms |
148472 KB |
Output is correct |
14 |
Correct |
83 ms |
148344 KB |
Output is correct |
15 |
Correct |
85 ms |
148344 KB |
Output is correct |
16 |
Correct |
85 ms |
148476 KB |
Output is correct |
17 |
Correct |
87 ms |
148472 KB |
Output is correct |
18 |
Correct |
91 ms |
148344 KB |
Output is correct |
19 |
Correct |
86 ms |
148344 KB |
Output is correct |
20 |
Correct |
85 ms |
148728 KB |
Output is correct |
21 |
Correct |
87 ms |
148344 KB |
Output is correct |
22 |
Correct |
91 ms |
148344 KB |
Output is correct |
23 |
Correct |
84 ms |
148600 KB |
Output is correct |
24 |
Correct |
85 ms |
148732 KB |
Output is correct |
25 |
Correct |
82 ms |
148728 KB |
Output is correct |
26 |
Correct |
104 ms |
148728 KB |
Output is correct |
27 |
Correct |
83 ms |
148728 KB |
Output is correct |
28 |
Correct |
87 ms |
148728 KB |
Output is correct |
29 |
Correct |
94 ms |
148744 KB |
Output is correct |
30 |
Correct |
86 ms |
148600 KB |
Output is correct |
31 |
Correct |
89 ms |
148712 KB |
Output is correct |
32 |
Correct |
89 ms |
148848 KB |
Output is correct |
33 |
Correct |
100 ms |
148728 KB |
Output is correct |
34 |
Correct |
99 ms |
148728 KB |
Output is correct |
35 |
Correct |
100 ms |
149368 KB |
Output is correct |
36 |
Correct |
87 ms |
148600 KB |
Output is correct |
37 |
Correct |
106 ms |
149752 KB |
Output is correct |
38 |
Correct |
109 ms |
149952 KB |
Output is correct |
39 |
Correct |
110 ms |
149880 KB |
Output is correct |
40 |
Correct |
111 ms |
150100 KB |
Output is correct |
41 |
Correct |
111 ms |
149964 KB |
Output is correct |
42 |
Correct |
90 ms |
149496 KB |
Output is correct |
43 |
Correct |
90 ms |
149496 KB |
Output is correct |
44 |
Correct |
87 ms |
149532 KB |
Output is correct |
45 |
Correct |
143 ms |
151360 KB |
Output is correct |
46 |
Correct |
141 ms |
151176 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
84 ms |
148344 KB |
Output is correct |
2 |
Correct |
85 ms |
148344 KB |
Output is correct |
3 |
Correct |
83 ms |
148472 KB |
Output is correct |
4 |
Correct |
84 ms |
148472 KB |
Output is correct |
5 |
Correct |
84 ms |
148344 KB |
Output is correct |
6 |
Correct |
83 ms |
148344 KB |
Output is correct |
7 |
Correct |
83 ms |
148344 KB |
Output is correct |
8 |
Correct |
85 ms |
148272 KB |
Output is correct |
9 |
Correct |
85 ms |
148300 KB |
Output is correct |
10 |
Correct |
84 ms |
148344 KB |
Output is correct |
11 |
Correct |
83 ms |
148344 KB |
Output is correct |
12 |
Correct |
83 ms |
148344 KB |
Output is correct |
13 |
Correct |
83 ms |
148344 KB |
Output is correct |
14 |
Correct |
83 ms |
148472 KB |
Output is correct |
15 |
Correct |
82 ms |
148472 KB |
Output is correct |
16 |
Correct |
85 ms |
148344 KB |
Output is correct |
17 |
Correct |
85 ms |
148472 KB |
Output is correct |
18 |
Correct |
84 ms |
148344 KB |
Output is correct |
19 |
Correct |
84 ms |
148344 KB |
Output is correct |
20 |
Correct |
86 ms |
148728 KB |
Output is correct |
21 |
Correct |
85 ms |
148344 KB |
Output is correct |
22 |
Correct |
83 ms |
148344 KB |
Output is correct |
23 |
Correct |
84 ms |
148728 KB |
Output is correct |
24 |
Correct |
85 ms |
148856 KB |
Output is correct |
25 |
Correct |
87 ms |
148728 KB |
Output is correct |
26 |
Correct |
85 ms |
148728 KB |
Output is correct |
27 |
Correct |
87 ms |
148728 KB |
Output is correct |
28 |
Correct |
87 ms |
148728 KB |
Output is correct |
29 |
Correct |
90 ms |
148728 KB |
Output is correct |
30 |
Correct |
86 ms |
148672 KB |
Output is correct |
31 |
Correct |
87 ms |
148728 KB |
Output is correct |
32 |
Correct |
85 ms |
148728 KB |
Output is correct |
33 |
Correct |
100 ms |
148728 KB |
Output is correct |
34 |
Correct |
97 ms |
148728 KB |
Output is correct |
35 |
Correct |
101 ms |
149556 KB |
Output is correct |
36 |
Correct |
88 ms |
148600 KB |
Output is correct |
37 |
Correct |
110 ms |
149752 KB |
Output is correct |
38 |
Correct |
112 ms |
150136 KB |
Output is correct |
39 |
Correct |
119 ms |
149880 KB |
Output is correct |
40 |
Correct |
107 ms |
149880 KB |
Output is correct |
41 |
Correct |
107 ms |
149880 KB |
Output is correct |
42 |
Correct |
89 ms |
149496 KB |
Output is correct |
43 |
Correct |
87 ms |
149496 KB |
Output is correct |
44 |
Correct |
88 ms |
149532 KB |
Output is correct |
45 |
Correct |
146 ms |
151156 KB |
Output is correct |
46 |
Correct |
150 ms |
151176 KB |
Output is correct |
47 |
Correct |
208 ms |
154868 KB |
Output is correct |
48 |
Correct |
96 ms |
149880 KB |
Output is correct |
49 |
Correct |
103 ms |
149628 KB |
Output is correct |
50 |
Correct |
97 ms |
149380 KB |
Output is correct |
51 |
Correct |
154 ms |
156204 KB |
Output is correct |
52 |
Correct |
155 ms |
156152 KB |
Output is correct |
53 |
Correct |
103 ms |
154360 KB |
Output is correct |
54 |
Correct |
91 ms |
153592 KB |
Output is correct |
55 |
Correct |
92 ms |
153592 KB |
Output is correct |
56 |
Correct |
105 ms |
155020 KB |
Output is correct |
57 |
Correct |
210 ms |
153660 KB |
Output is correct |
58 |
Correct |
99 ms |
154232 KB |
Output is correct |
59 |
Correct |
109 ms |
154488 KB |
Output is correct |
60 |
Correct |
116 ms |
154748 KB |
Output is correct |
61 |
Correct |
107 ms |
154612 KB |
Output is correct |
62 |
Correct |
146 ms |
156536 KB |
Output is correct |
63 |
Correct |
178 ms |
178288 KB |
Output is correct |
64 |
Correct |
189 ms |
186608 KB |
Output is correct |
65 |
Correct |
493 ms |
184812 KB |
Output is correct |
66 |
Execution timed out |
1053 ms |
178540 KB |
Time limit exceeded |
67 |
Halted |
0 ms |
0 KB |
- |