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>
using namespace std;
typedef long long int ll;
typedef long double doublel;
#define f first
#define s second
const int N = 30000 + 100;
const ll base = 313;
const ll mod = 1e9 + 9;
const int inf = 1e8;
set<pair<int, int>> s;
int dis[N];
vector<pair<int, int>> adj[N];
int n, m, b, p;
void dij(int u)
{
for(int i = 0; i < n; i++)
dis[i] = inf;
dis[u] = 0;
for(int i = 0; i < n; i++)
s.insert({dis[i], i});
while(!s.empty())
{
int x = s.begin() -> s;
s.erase(s.begin());
for(auto y : adj[x])
{
if(dis[y.f] > dis[x] + y.s)
{
s.erase({dis[y.f], y.f});
dis[y.f] = dis[x] + y.s;
s.insert({dis[y.f], y.f});
}
}
}
}
int main()
{
ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
int x, y;
cin >> n >> m;
for(int i = 0; i < m; i++)
{
cin >> b >> p;
for(int i = b+p; i < n; i += p)
{
adj[b].push_back({i, (i-b)/p});
//cout << i << ' ' << b << ' ' << (i-b)/p << endl;
}
for(int i = b-p; i >= 0; i -= p)
{
adj[b].push_back({i, (b-i)/p});
//cout << i << ' ' << b << ' ' << (b-i)/p << endl;
}
if(i == 0)
x = b;
if(i == 1)
y = b;
}
dij(x);
if(dis[y] >= inf)
dis[y] = -1;
cout << dis[y] << endl;
return 0;
}
/*
5 3
0 2
1 1
4 1
*/
Compilation message (stderr)
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:83:15: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
83 | cout << dis[y] << endl;
| ^
skyscraper.cpp:79:5: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
79 | dij(x);
| ~~~^~~
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