| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 807069 | amine_aroua | Crocodile's Underground City (IOI11_crocodile) | C++17 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
using namespace std;
#define int long long
#define vi vector<int>
#define vl vector<long long>
#define vii vector<pair<int,int>>
#define vll vector<pair<long long,long long>>
#define pb push_back
#define ll long long
#define ld long double
#define nl '\n'
#define boost ios::sync_with_stdio(false)
#define mp make_pair
#define se second
#define fi first
#define fore(i, y) for(int i = 0; i < y; i++)
#define forr(i,x,y) for(int i = x;i<=y;i++)
#define forn(i,y,x) for(int i = y; i >= x; i--)
#define all(v) v.begin(),v.end()
#define sz(v) v.size()
#define clr(v,k) memset(v,k,sizeof(v))
#define rall(v) v.rbegin() , v.rend()
#define pii pair<int,int>
#define pll pair<ll , ll>
const ll MOD = 1e9 + 7;
const ll INF = 1e18 + 1;
const int inf = 1e9 + 1;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (gcd)
ll lcm(ll a , ll b) {return a * (b / gcd(a , b));} // least common multiple (lcm)
// HERE IS THE SOLUTION
const int N = 100000;
vii adj[N];
vi dp(N , INF);
vector<bool> leaf(N , 0);
vi distEnd , distOne;
vi dijkstra(int n ,vi start)
{
vi dist(n);
priority_queue<pii> pq;
for(auto x : start)
{
dist[x] = 0;
pq.push({0 , x});
}
vector<bool> vis(n , 0);
while(!pq.empty())
{
int cur = pq.top().se;
pq.pop();
if(vis[cur])
continue;
vis[cur] = 1;
for(auto [u,c] : adj[cur])
{
if(dist[u] > dist[cur] + c)
{
dist[u] = dist[cur]+ c;
pq.push({-dist[u] , u});
}
}
}
return dist;
}
int dfs(int x , int cur)
{
if(dp[x] != INF)
return dp[x];
dp[x] = INF - 1;
if(leaf[x])
return cur;
vector<vi> v;
for(auto u : adj[x])
{
v.pb({distOne[u.fi] , distEnd[u.fi] + u.se , u.fi});
}
sort(all(v));
forr(i , 1 , sz(v) - 1)
{
dp[x] = min(dp[x] , dfs(v[i][2] , cur + v[i][1] - distEnd[v[i][2]]));
}
return dp[x];
}
vi bfs(int n ,vi start)
{
vi dist(n);
queue<int> pq;
for(auto x : start)
{
dist[x] = 0;
pq.push(x);
}
vector<bool> vis(n , 0);
while(!pq.empty())
{
int cur = pq.front();
pq.pop();
if(vis[cur])
continue;
vis[cur] = 1;
for(auto [u,c] : adj[cur])
{
if(dist[u] > dist[cur] + 1)
{
dist[u] = dist[cur]+ 1;
pq.push(u);
}
}
}
return dist;
}
int travel_plan(int n , int m , vector<vi> r , vi l , int k , vi p)
{
fore(i , m)
{
vi v = r[i];
adj[v[0]].pb({v[1] , l[i]});
adj[v[1]].pb({v[0] , l[i]});
}
fore(i , k)
{
leaf[p[i]] = 1;
}
distEnd = dijkstra(n,p);
distOne = bfs(n,p);
return dfs(0 , 0);
}
//signed main()
//{
// cin.tie(0);
// cout.tie(0);
// boost;
// int n , m;
// vector<vi> r(m);
// vi l(m);
// int k;
// vi p(k);
// cin>>n>>m>>k;
// fore(i , k)
// cin>>p[i];
// fore(i , m)
// {
// int u , v , c;
// cin>>u>>v>>c;
// r[i] = {u , v};
// l[i] = c;
// }
// cout<<travel_plan(n , m , r , l , k , p);
//}