#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
int n, m;
int S[30005], P[30005];
int dist[30005];
vector<int> pos[30005];
int go[2005][2005];
bool vis[300005];
queue<int> q[30005];
void solve(){
cin >> n >> m;
for(int i=0;i<m;i++)cin >> S[i] >> P[i], pos[S[i]].push_back(i);
for(int i=0;i<m;i++)dist[i] = 1e9;
dist[0] = 0;
q[0].push(0);
bool f = 0;
for(int i=0;i<30000;i++){
while(!q[i].empty()){
int j = q[i].front(); q[i].pop();
if(dist[j] < i)continue;
if(j == 1){
f = 1;
break;
}
for(auto x : pos[S[j]]){
if(dist[x] > i){
dist[x] = i;
if(P[x] != P[j])q[i].push(x);
}
}
pos[S[j]].clear();
for(int a=S[j] + P[j];a<n;a+=P[j]){
if(i + abs(S[j] - a) / P[j] > 30000)break;
for(auto x : pos[a]){
if(dist[x] <= dist[j] + abs(S[j] - S[x]) / P[j])break;
dist[x] = i + abs(S[j] - S[x]) / P[j];
if(dist[x] > 30000)continue;
if(P[x] != P[j])q[dist[x]].push(x);
break;
}
}
for(int a=S[j] - P[j]; a >= 0; a-= P[j]){
if(i + abs(S[j] - a) / P[j] > 30000)break;
for(auto x : pos[a]){
if(dist[x] <= dist[j] + abs(S[j] - S[x]) / P[j])break;
dist[x] = i + abs(S[j] - S[x]) / P[j];
if(dist[x] > 30000)continue;
if(P[x] != P[j])q[dist[x]].push(x);
break;
}
}
}
if(f)break;
}
cout << (dist[1] == 1e9 ? -1 : dist[1]);
}
main(){
ios::sync_with_stdio(0);cin.tie(0);
int tc = 1;
//cin >> tc;
for(int tc1=1;tc1<=tc;tc1++){
// cout << "Case #" << tc1 << ": ";
solve();
}
}
Compilation message
skyscraper.cpp:68:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
68 | main(){
| ^~~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
17 ms |
21160 KB |
Output is correct |
2 |
Correct |
16 ms |
21252 KB |
Output is correct |
3 |
Correct |
16 ms |
21200 KB |
Output is correct |
4 |
Correct |
17 ms |
21248 KB |
Output is correct |
5 |
Correct |
13 ms |
21224 KB |
Output is correct |
6 |
Correct |
14 ms |
21252 KB |
Output is correct |
7 |
Correct |
15 ms |
21248 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
14 ms |
21204 KB |
Output is correct |
2 |
Correct |
17 ms |
21204 KB |
Output is correct |
3 |
Correct |
14 ms |
21204 KB |
Output is correct |
4 |
Correct |
17 ms |
21248 KB |
Output is correct |
5 |
Correct |
15 ms |
21168 KB |
Output is correct |
6 |
Correct |
16 ms |
21256 KB |
Output is correct |
7 |
Correct |
16 ms |
21244 KB |
Output is correct |
8 |
Correct |
15 ms |
21204 KB |
Output is correct |
9 |
Correct |
16 ms |
21236 KB |
Output is correct |
10 |
Correct |
14 ms |
21148 KB |
Output is correct |
11 |
Correct |
14 ms |
21268 KB |
Output is correct |
12 |
Correct |
15 ms |
21296 KB |
Output is correct |
13 |
Correct |
15 ms |
21204 KB |
Output is correct |
14 |
Correct |
18 ms |
21240 KB |
Output is correct |
15 |
Correct |
15 ms |
21308 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
14 ms |
21204 KB |
Output is correct |
2 |
Correct |
17 ms |
21204 KB |
Output is correct |
3 |
Correct |
14 ms |
21204 KB |
Output is correct |
4 |
Correct |
13 ms |
21240 KB |
Output is correct |
5 |
Correct |
17 ms |
21216 KB |
Output is correct |
6 |
Correct |
13 ms |
21156 KB |
Output is correct |
7 |
Correct |
13 ms |
21248 KB |
Output is correct |
8 |
Correct |
12 ms |
21204 KB |
Output is correct |
9 |
Correct |
16 ms |
21168 KB |
Output is correct |
10 |
Correct |
14 ms |
21188 KB |
Output is correct |
11 |
Correct |
17 ms |
21332 KB |
Output is correct |
12 |
Correct |
14 ms |
21332 KB |
Output is correct |
13 |
Correct |
15 ms |
21328 KB |
Output is correct |
14 |
Correct |
17 ms |
21324 KB |
Output is correct |
15 |
Correct |
16 ms |
21292 KB |
Output is correct |
16 |
Correct |
17 ms |
21204 KB |
Output is correct |
17 |
Correct |
15 ms |
21204 KB |
Output is correct |
18 |
Correct |
13 ms |
21300 KB |
Output is correct |
19 |
Correct |
13 ms |
21204 KB |
Output is correct |
20 |
Correct |
14 ms |
21332 KB |
Output is correct |
21 |
Correct |
14 ms |
21204 KB |
Output is correct |
22 |
Correct |
13 ms |
21204 KB |
Output is correct |
23 |
Correct |
18 ms |
21248 KB |
Output is correct |
24 |
Correct |
18 ms |
21376 KB |
Output is correct |
25 |
Correct |
14 ms |
21332 KB |
Output is correct |
26 |
Incorrect |
15 ms |
21276 KB |
Output isn't correct |
27 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
13 ms |
21168 KB |
Output is correct |
2 |
Correct |
14 ms |
21252 KB |
Output is correct |
3 |
Correct |
14 ms |
21240 KB |
Output is correct |
4 |
Correct |
17 ms |
21204 KB |
Output is correct |
5 |
Correct |
13 ms |
21204 KB |
Output is correct |
6 |
Correct |
13 ms |
21204 KB |
Output is correct |
7 |
Correct |
17 ms |
21252 KB |
Output is correct |
8 |
Correct |
16 ms |
21164 KB |
Output is correct |
9 |
Correct |
14 ms |
21204 KB |
Output is correct |
10 |
Correct |
13 ms |
21264 KB |
Output is correct |
11 |
Correct |
15 ms |
21204 KB |
Output is correct |
12 |
Correct |
15 ms |
21208 KB |
Output is correct |
13 |
Correct |
16 ms |
21204 KB |
Output is correct |
14 |
Correct |
17 ms |
21332 KB |
Output is correct |
15 |
Correct |
15 ms |
21264 KB |
Output is correct |
16 |
Correct |
14 ms |
21204 KB |
Output is correct |
17 |
Correct |
13 ms |
21328 KB |
Output is correct |
18 |
Correct |
13 ms |
21296 KB |
Output is correct |
19 |
Correct |
13 ms |
21204 KB |
Output is correct |
20 |
Correct |
14 ms |
21332 KB |
Output is correct |
21 |
Correct |
14 ms |
21196 KB |
Output is correct |
22 |
Correct |
13 ms |
21236 KB |
Output is correct |
23 |
Correct |
14 ms |
21204 KB |
Output is correct |
24 |
Correct |
15 ms |
21332 KB |
Output is correct |
25 |
Correct |
15 ms |
21284 KB |
Output is correct |
26 |
Incorrect |
14 ms |
21332 KB |
Output isn't correct |
27 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
13 ms |
21204 KB |
Output is correct |
2 |
Correct |
14 ms |
21232 KB |
Output is correct |
3 |
Correct |
14 ms |
21296 KB |
Output is correct |
4 |
Correct |
15 ms |
21192 KB |
Output is correct |
5 |
Correct |
17 ms |
21228 KB |
Output is correct |
6 |
Correct |
17 ms |
21220 KB |
Output is correct |
7 |
Correct |
14 ms |
21204 KB |
Output is correct |
8 |
Correct |
16 ms |
21252 KB |
Output is correct |
9 |
Correct |
13 ms |
21204 KB |
Output is correct |
10 |
Correct |
16 ms |
21264 KB |
Output is correct |
11 |
Correct |
14 ms |
21340 KB |
Output is correct |
12 |
Correct |
15 ms |
21232 KB |
Output is correct |
13 |
Correct |
16 ms |
21204 KB |
Output is correct |
14 |
Correct |
14 ms |
21352 KB |
Output is correct |
15 |
Correct |
14 ms |
21252 KB |
Output is correct |
16 |
Correct |
13 ms |
21204 KB |
Output is correct |
17 |
Correct |
14 ms |
21228 KB |
Output is correct |
18 |
Correct |
13 ms |
21268 KB |
Output is correct |
19 |
Correct |
13 ms |
21204 KB |
Output is correct |
20 |
Correct |
13 ms |
21356 KB |
Output is correct |
21 |
Correct |
17 ms |
21204 KB |
Output is correct |
22 |
Correct |
16 ms |
21252 KB |
Output is correct |
23 |
Correct |
17 ms |
21220 KB |
Output is correct |
24 |
Correct |
16 ms |
21332 KB |
Output is correct |
25 |
Correct |
16 ms |
21332 KB |
Output is correct |
26 |
Incorrect |
16 ms |
21332 KB |
Output isn't correct |
27 |
Halted |
0 ms |
0 KB |
- |