Submission #510295

#TimeUsernameProblemLanguageResultExecution timeMemory
510295thiago_bastosJakarta Skyscrapers (APIO15_skyscraper)C++17
57 / 100
1087 ms34456 KiB
#include "bits/stdc++.h" #include <ext/pb_ds/assoc_container.hpp> using namespace __gnu_pbds; using namespace std; using i64 = long long; using u64 = unsigned long long; using i32 = int; using u32 = unsigned; using i16 = short; using u16 = unsigned short; using ld = long double; using ii = pair<int, int>; const int N = 3e4 + 100, INF = 1e9; vector<int> P[N]; gp_hash_table<int, int> jumps[N]; void solve() { int n, m; cin >> n >> m; vector<int> cnt(n, INF); queue<ii> q; vector<ii> a(m); int x0 = -1, x1 = -1; for(int i = 0; i < m; ++i) { int b, p; cin >> b >> p; if(!i) x0 = b; else if(i == 1) x1 = b; a[i] = {p, b}; } sort(a.begin(), a.end()); for(auto [p, b] : a) { if(!P[b].empty() && P[b].back() == p) continue; for(int x = b % p; x < n; x += p) jumps[x][p] = -1; P[b].push_back(p); } while(!P[x0].empty()) { int k = P[x0].back(); P[x0].pop_back(); if(jumps[x0][k] == -1) { jumps[x0][k] = 0; q.emplace(x0, k); } } while(!q.empty()) { auto [x, p] = q.front(); q.pop(); int j = jumps[x][p]; cnt[x] = min(cnt[x], j); if(x == x1) break; if(x >= p && jumps[x - p][p] == -1) { jumps[x - p][p] = 1 + j; q.emplace(x - p, p); } if(x + p < n && jumps[x + p][p] == -1) { jumps[x + p][p] = 1 + j; q.emplace(x + p, p); } while(!P[x].empty()) { int k = P[x].back(); P[x].pop_back(); if(x >= k && jumps[x - k][k] == -1) { jumps[x - k][k] = 1 + j; q.emplace(x - k, k); } if(x + k < n && jumps[x + k][k] == -1) { jumps[x + k][k] = 1 + j; q.emplace(x + k, k); } } } if(cnt[x1] == INF) cout << "-1\n"; else cout << cnt[x1] << '\n'; } int main() { ios_base :: sync_with_stdio(false); cin.tie(0); int t = 1; //cin >> t; while(t--) solve(); return 0; }
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