Submission #977867

#	Time	Username	Problem	Language	Result	Execution time	Memory
977867		Unforgettablepl	Cyberland (APIO23_cyberland)	C++17	49 / 100	3086 ms	799304 KiB

cyberland

#include <bits/stdc++.h>
using namespace std;

#define int long long

vector<int32_t> powers;
vector<vector<pair<int,double>>> adj;
priority_queue<pair<double,pair<int,int>>,vector<pair<double,pair<int,int>>>,greater<>> q;
vector<bool> visited;

void dfs(int x){
    if(visited[x])return;
    visited[x]=true;
    if(powers[x]==0)q.emplace(0, make_pair(x,0));
    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) {
    swap(powers,arr);
    visited = vector<bool>(N);
    adj = vector<vector<pair<int,double>>>(N);
    while(!q.empty())q.pop();
    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]);
    }
    dfs(0);
    vector<vector<bool>> vis(N,vector<bool>(K+1));
    while(!q.empty()){
        auto [tim,curr] = q.top();q.pop();
        if(curr.first==H)return tim;
        if(vis[curr.first][curr.second])continue;
        vis[curr.first][curr.second]=true;
        for(auto[dest,cost]:adj[curr.first]){
            if(!vis[dest][curr.second])q.emplace(tim+cost,make_pair(dest,curr.second));
            if(powers[dest]==2 and curr.second<K and !vis[dest][curr.second+1])q.emplace((tim+cost)/double(2),make_pair(dest,curr.second+1));
        }
    }
    return -1;
}

//int32_t main() {
//    int32_t T;
//    assert(1 == scanf("%d", &T));
//    while (T--){
//        int32_t N,M,K,H;
//        assert(4 == scanf("%d %d %d\n%d", &N, &M, &K, &H));
//        std::vector<int32_t> x(M);
//        std::vector<int32_t> y(M);
//        std::vector<int32_t> c(M);
//        std::vector<int32_t> arr(N);
//        for (int32_t i=0;i<N;i++)
//            assert(1 == scanf("%d", &arr[i]));
//        for (int32_t i=0;i<M;i++)
//            assert(3 == scanf("%d %d %d", &x[i], &y[i], &c[i]));
//        printf("%.12lf\n", solve(N, M, K, H, x, y, c, arr));
//    }
//}

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 13 / 13
• Subtask 4: 0 / 19
• Subtask 5: 7 / 7
• Subtask 6: 16 / 16
• Subtask 7: 0 / 29
• Subtask 8: 0 / 3