이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
#define ff first
#define ss second
#define mp make_pair
#define pb push_back
#define pp push
#define MOD 1000000007
#define INF 1e18
#define N 30005
#define M 5000000
typedef long long ll;
const ll c=174;
using namespace std;
ll b[N],p[N],path[N];
ll pos[N];
map<ll,bool>pp[N];
vector<pair<ll,ll> >adj[N];
bool vis[N],visited[N];
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
ll n,m;
cin >> n >> m;
for(ll i=1;i<=m;++i){
cin >> b[i] >> p[i];
if(pp[b[i]][p[i]]!=0){
vis[i]=1;
}
else{
++pos[b[i]];
pp[b[i]][p[i]]=1;
}
}
if(b[1]==b[2]){
cout << 0;
return 0;
}
for(ll i=1;i<=m;++i){
if(vis[i]==1) continue;
for(ll j=b[i]+p[i];j<n;j+=p[i]){
if(pos[j]) adj[b[i]].pb({j,(j-b[i])/p[i]});
if(pp[j][p[i]]==1) break;
}
for(ll j=b[i]-p[i];j>=0;j-=p[i]){
if(pos[j]) adj[b[i]].pb({j,(b[i]-j)/p[i]});
if(pp[j][p[i]]==1) break;
}
}
priority_queue<pair<ll,ll> >pq;
pq.push({0,b[1]});
while(!pq.empty()){
ll cost=-pq.top().ff;
ll doge_id=pq.top().ss;
// cout << doge_id <<" " << cost << '\n';
path[doge_id]=cost;
pq.pop();
visited[doge_id]=1;
for(pair<int,int>i:adj[doge_id]){
pq.push({-(cost+i.ss),i.ff});
}
while(!pq.empty() && visited[pq.top().ss]==1) pq.pop();
}
cout << (path[b[2]]==0?-1:path[b[2]]);
}
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