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;
const int O = 3e4 + 5;
const int inf = 1e9;
int n, m, b[O], d[O], p[O];
bool inq[O];
main(){
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
cin >> n >> m;
for (int i = 1; i <= m; ++ i){
cin >> b[i] >> p[i];
}
for (int i = 1; i <= m; ++ i) d[i] = inf;
d[1] = 0;
priority_queue <pair <int, int>, vector <pair <int, int>>, greater <pair <int, int>>> q;
q.push(make_pair(0, 1)); inq[1] = true;
while (q.size()){
int u = q.top().second;
int du = q.top().first;
q.pop();
if (du != d[u]) continue;
inq[u] = false;
for (int v = 1; v <= m; ++ v){
if (v != u && d[v] > d[u] + abs(b[u] - b[v]) / p[u] && abs(b[u] - b[v]) % p[u] == 0){
d[v] = d[u] + abs(b[u] - b[v]) / p[u];
if (inq[v] == 0){
q.push(make_pair(d[v], v));
inq[v] = true;
}
}
}
}
if (d[2] >= inf) cout << -1;
else cout << d[2];
}
Compilation message (stderr)
skyscraper.cpp:11:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
11 | main(){
| ^~~~
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