제출 #169350

#제출 시각아이디문제언어결과실행 시간메모리
169350MilkiJakarta Skyscrapers (APIO15_skyscraper)C++14
57 / 100
1100 ms125408 KiB
#pragma GCC optimize("Ofast") #pragma GCC optimize ("unroll-loops") #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") #include<bits/stdc++.h> using namespace std; #define FOR(i, a, b) for(int i = a; i < b; ++i) #define REP(i, n) FOR(i, 0, n) #define _ << " " << #define sz(x) ((int) x.size()) #define pb(x) push_back(x) #define TRACE(x) cerr << #x << " = " << x << endl typedef long long ll; typedef pair<int, int> point; const int mod = 1e9 + 7; int add(int x, int y) {x += y; if(x >= mod) return x - mod; return x;} int sub(int x, int y) {x -= y; if(x < 0) return x + mod; return x;} int mul(int x, int y) {return (ll) x * y % mod;} const int MAXN = 3e4 + 5; int n, m, dist[MAXN], start[MAXN]; unordered_set<int> S[MAXN]; vector <point> E[MAXN]; struct Edge{ int x, cost; Edge(){} Edge(int x, int cost) : x(x), cost(cost) {} friend bool operator < (const Edge &A, const Edge &B){ return A.cost > B.cost; } }; void update(int pos, int range){ int cnt = 1; for(int i = pos + range; i < n; i += range){ E[pos].pb(point(i, cnt)); cnt ++; if(S[i].find(range) != S[i].end()) break; } cnt = 1; for(int i = pos - range; i >= 0; i -= range){ E[pos].pb(point(i, cnt)); cnt ++; if(S[i].find(range) != S[i].end()) break; } } int dijkstra(){ priority_queue <Edge> Q; Q.push(Edge(start[0], 0)); vector <int> d(n, -1); while(!Q.empty()){ while(!Q.empty() && d[Q.top().x] != -1) Q.pop(); if(Q.empty()) break; auto edge = Q.top(); d[edge.x] = edge.cost; if(edge.x == start[1]) break; for(auto it : S[edge.x]) update(edge.x, it); for(auto e : E[edge.x]){ int ncvor = e.first, ndist = e.second; if(d[ncvor] != -1) continue; Q.push(Edge( ncvor, edge.cost + ndist )); } } return d[start[1]]; } int main(){ ios_base::sync_with_stdio(false); cin.tie(0); cin >> n >> m; REP(i, m) cin >> start[i] >> dist[i]; REP(i, m) if(start[i] != start[1]) S[start[i]].insert(dist[i]); cout << dijkstra(); }
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