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 int long long
#define float double
#define pb push_back
#define F first
#define S second
#define T int t; cin >> t; while(t--)
#define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
using namespace std;
/// Benzema is the best player in the world
const int N = 1e6 + 6;
const int M = 1e3 + 3;
const int mod = 1e9 + 7;
const int inf = 1e18;
const int dx[] = {-1, 1, 0, 0};
const int dy[] = {0, 0, -1, 1};
const int LOG = 28;
int n, m;
int p[N], dist[N];
vector<pair<int, int>> adj[N];
priority_queue<pair<int, int>> q;
bool vis[N];
int b[N];
void dij() {
for(int i = 1; i <= n; i++) dist[i] = inf;
q.push({0, b[1]});
dist[b[1]] = 0;
while(!q.empty()) {
int u = q.top().S;
q.pop();
if (vis[u]) continue;
vis[u] = 1;
for(auto x: adj[u]) {
if (dist[x.F] > dist[u] + x.S)
dist[x.F] = dist[u] + x.S, q.push({-dist[x.F], x.F});
}
}
}
main() {
IOS
cin >> n >> m;
for(int i = 1; i <= m; i++) {
cin >> b[i] >> p[i];
b[i]++;
int j = b[i] - p[i], cnt = 1;
while(j >= 1) {
adj[b[i]].push_back({j, cnt++});
j -= p[i];
}
cnt = 1, j = b[i] + p[i];
while(j <= n) {
adj[b[i]].push_back({j, cnt++});
j += p[i];
}
}
dij();
if (dist[b[2]] == inf) dist[b[2]] = -1;
cout << dist[b[2]];
}
Compilation message (stderr)
skyscraper.cpp:42:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
42 | main() {
| ^~~~
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