Submission #959916

#	Time	Username	Problem	Language	Result	Execution time	Memory
959916		GrindMachine	Crocodile's Underground City (IOI11_crocodile)	C++17	89 / 100	2035 ms	62924 KiB

crocodile

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "crocodile.h"

vector<pii> adj1[N], adj2[N];
vector<int> dp(N);
vector<bool> spl(N);
vector<bool> vis(N);
vector<int> topo;

void dfs1(int u){
    vis[u] = 1;

    for(auto [v,w] : adj2[u]){
        if(vis[v]) conts;
        dfs1(v);
    }

    topo.pb(u);
}

int travel_plan(int n, int m, int R[][2], int L[], int k, int P[])
{
    rep(i,m){
        int u = R[i][0], v = R[i][1], w = L[i];
        adj1[u].pb({v,w}), adj1[v].pb({u,w});
    }
    rep(i,k){
        spl[P[i]] = 1;
    }

    while(true){
        bool changed = false;

        rep(u,n){
            if(spl[u]){
                dp[u] = 0;
                conts;
            }

            vector<int> vals;
            for(auto [v,w] : adj1[u]){
                vals.pb(dp[v]+w);
            }

            sort(all(vals));
            int new_val = inf1;
            if(sz(vals) >= 2) new_val = vals[1];

            if(new_val != dp[u]){
                changed = true;
            }

            dp[u] = new_val;
        }

        if(!changed) break;
    }

    int ans = dp[0];
    return ans;

    // priority_queue<pll,vector<pll>,greater<pll>> pq;
    // vector<ll> dis(n+5,inf2);
    // pq.push({0,0});

    // while(!pq.empty()){
    //     auto [cost,u] = pq.top();
    //     pq.pop();

    //     if(vis[u]) conts;
    //     vis[u] = 1;
    //     dis[u] = cost;

    //     for(auto [v,w] : adj1[u]){
    //         pq.push({cost+w,v});
    //     }
    // }

    // rep1(u,n){
    //     for(auto [v,w] : adj1[u]){
    //         if(dis[u]+w == dis[v]){
    //             adj2[u].pb({v,w});
    //         }
    //     }
    // }

    // fill(all(vis),0);
    // dfs1(0);

    // trav(u,topo){
    //     if(spl[u]){
    //         dp[u] = 0;
    //         conts;
    //     }

    //     vector<int> vals;
    //     for(auto [v,w] : adj2[u]){
    //         vals.pb(dp[v]+w);
    //     }

    //     sort(all(vals));
    //     if(sz(vals) < 2){
    //         dp[u] = inf1;
    //     }
    //     else{
    //         dp[u] = vals[1];
    //     }
    // }

    // int ans = dp[0];
    // return ans;
}

• Subtask 1: 46 / 46
• Subtask 2: 43 / 43
• Subtask 3: 0 / 11