Submission #939177

#TimeUsernameProblemLanguageResultExecution timeMemory
939177a_l_i_r_e_z_aJakarta Skyscrapers (APIO15_skyscraper)C++17
100 / 100
156 ms94340 KiB
// In the name of God // Hope is last to die #include <bits/stdc++.h> using namespace std; #pragma GCC optimize("O3,unroll-loops") #pragma GCC target("avx2") typedef long long ll; typedef long double ld; typedef pair<int, int> pii; typedef pair<ll, ll> pll; #define pb push_back #define int long long #define S second #define F first #define mp make_pair #define smax(x, y) (x) = max((x), (y)) #define smin(x, y) (x) = min((x), (y)) #define all(x) (x).begin(), (x).end() const int maxn = 3e4 + 5, maxd = 1e6 + 5; const int inf = 1e9 + 7; int n, m, s, t, d[maxn]; vector<int> vec[maxn], asli[maxd]; vector<pii> adj[maxn]; bool mark[maxn]; void dij(){ memset(d, 63, sizeof d); d[s] = 0; asli[0].pb(s); for(int i = 0; i < maxd; i++){ for(auto v: asli[i]){ for(auto [u, w]: adj[v]){ if(d[u] > d[v] + w){ d[u] = d[v] + w; asli[d[u]].pb(u); } } } } } int32_t main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); cin >> n >> m; for(int i = 0; i < m; i++){ int b, p; cin >> b >> p; if(p < n) vec[p].pb(b); if(i == 0) s = b; if(i == 1) t = b; } for(int p = 1; p < n; p++){ sort(all(vec[p])); vec[p].resize(unique(all(vec[p])) - vec[p].begin()); for(auto u: vec[p]) mark[u] = 1; for(auto &i: vec[p]){ if(!mark[i]) continue; for(int j = i - p; j >= 0; j -= p){ adj[i].pb(mp(j, (i - j) / p)); if(mark[j]) break; } for(int j = i + p; j < n; j += p){ adj[i].pb(mp(j, (j - i) / p)); if(mark[j]) break; } } for(auto u: vec[p]) mark[u] = 0; } dij(); if(d[t] >= inf) cout << -1 << '\n'; else cout << d[t] << '\n'; return 0; }
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