This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define FAST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);cerr.tie(0)
#define mp make_pair
#define xx first
#define yy second
#define pb push_back
#define pf push_front
#define popb pop_back
#define popf pop_front
#define all(x) x.begin(),x.end()
#define ff(i,a,b) for (int i = a; i < b; i++)
#define fff(i,a,b) for (int i = a; i <= b; i++)
#define bff(i,a,b) for (int i = b-1; i >= a; i--)
#define bfff(i,a,b) for (int i = b; i >= a; i--)
using namespace std;
long double typedef ld;
unsigned int typedef ui;
long long int typedef li;
pair<int,int> typedef pii;
pair<li,li> typedef pli;
pair<ld,ld> typedef pld;
vector<vector<int>> typedef graph;
unsigned long long int typedef ull;
//const int mod = 998244353;
//const int mod = 1000000007;
//Note to self: Check for overflow
vector<pii> g[30003];
bool vis[30003];
int km=0; const int sf=30'000;
vector<int> dat[2*sf+15];
int main()
{
FAST;
int n,m; cin>>n>>m;
set<pii> doges;
int s,t;
ff(i,0,m)
{
int b,p; cin>>b>>p;
doges.insert({b,p});
if (i==0) s=b;
if (i==1) t=b;
}
for (auto [b,p] : doges)
{
for (int i=1;;i++)
{
if (b+i*p>=n) break;
g[b].pb({b+i*p,i});
}
for (int i=1;;i++)
{
if (b-i*p<0) break;
g[b].pb({b-i*p,i});
}
}
dat[0].pb(s);
fff(d,0,n*1000)
{
if (d-km*sf>=sf)
{
ff(i,0,sf) dat[i]=dat[i+sf];
ff(i,0,sf) dat[i+sf].clear();
km++;
}
for (auto p : dat[d-km*sf])
{
if (vis[p]) continue; vis[p]=1;
if (p==t) return cout<<d,0;
for (auto it : g[p]) dat[d+it.yy-km*sf].emplace_back(it.xx);
}
dat[d-km*sf].clear();
}
cout<<-1;
}
//Note to self: Check for overflow
/*
5 3
0 2
1 1
4 1
*/
Compilation message (stderr)
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:84:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
84 | if (vis[p]) continue; vis[p]=1;
| ^~
skyscraper.cpp:84:35: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
84 | if (vis[p]) continue; vis[p]=1;
| ^~~
skyscraper.cpp:85:13: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
85 | if (p==t) return cout<<d,0;
| ^~
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