제출 #985445

#제출 시각아이디문제언어결과실행 시간메모리
985445oviyan_gandhi사이버랜드 (APIO23_cyberland)C++17
97 / 100
3056 ms30800 KiB
#pragma GCC optimize("Ofast,unroll-loops") #include <bits/stdc++.h> using namespace std; #define int long long #define MX 100000 int32_t powers[MX]; vector<pair<int,long double>> adj[MX]; priority_queue<pair<int,pair<long double,int>>,vector<pair<int,pair<long double,int>>>,greater<>> q; bool visited[MX]; void dfs(int x){ if(visited[x])return; visited[x]=true; if(powers[x]==0)q.emplace(0, make_pair(0,x)); for(auto[dest,c]:adj[x])dfs(dest); } double solve(int32_t N, int32_t M, int32_t K, int32_t H, vector<int32_t> x, vector<int32_t> y, vector<int32_t> c, vector<int32_t> arr) { K = min(K, 67); for (int i = 0; i < N; i++){ powers[i] = arr[i]; adj[i].clear(); } while(!q.empty())q.pop(); fill(visited, visited+N, false); powers[0] = 0; visited[H]=true; for(int i=0;i<M;i++){ adj[x[i]].emplace_back(y[i],c[i]); adj[y[i]].emplace_back(x[i],c[i]); } long double ans = 4e15; dfs(0); vector<vector<bool>> vis(N,vector<bool>(K+1)); while(!q.empty()){ auto [uses,curr] = q.top();q.pop(); auto [tim,idx] = curr; if(idx==H){ ans = min(ans,tim); continue; } if(vis[idx][uses])continue; vis[idx][uses]=true; for(auto[dest,cost]:adj[idx]){ if(!vis[dest][uses])q.emplace(uses,make_pair(tim+cost,dest)); if(powers[dest]==2 and uses<K and !vis[dest][uses+1])q.emplace(uses+1,make_pair((tim+cost)/(long double)(2),dest)); } } return ans>=4e15 ? -1 : ans; }
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