Submission #989590

#	Time	Username	Problem	Language	Result	Execution time	Memory
989590		mindiyak	Dreaming (IOI13_dreaming)	C++14	0 / 100	1020 ms	65536 KiB

dreaming

#include "dreaming.h"
#include <bits/stdc++.h>
#include <string>
#include <iostream>
#include <cmath>
#include <numeric>
#include <iomanip>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<int, int> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<ld> vd;
typedef vector<long> vl;
typedef vector<ull> vull;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (int i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define F first
#define nl endl
#define S second
#define lb lower_bound
#define ub upper_bound
#define aint(x) x.begin(), x.end()
#define raint(x) x.rbegin(), x.rend()
#define ins insert
const int MOD = 1000000007;

vi groups;
vector<vpi> paths;
vi costs;

void dfs(int pos,int head,int cost,vi visited){
    groups[pos] = min(groups[pos],head);
    for(auto a:paths[pos]){
        if(visited[a.F])continue;
        visited[a.F] = 1;
        // cout << head << " " << pos << " " << a.F << " " << costs[head] << " " << cost+a.S << endl;
        costs[head] = max(costs[head],cost+a.S);
        dfs(a.F,head,cost+a.S,visited);
    }
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    if(N==1)return 0;

    groups = vi(N);
    costs = vi(N,0);
    paths = vector<vpi>(N);
    FOR(i,0,N)groups[i] = i;

    FOR(i,0,M){
        paths[A[i]].pb({B[i],T[i]});
        paths[B[i]].pb({A[i],T[i]});
    }

    FOR(i,0,N){
        vi visited(N,0);
        visited[i] = 1;
        dfs(i,i,0,visited);

        // FOR(i,0,N){
        //     cout << setw(2) << i << " ";
        // }cout <<  endl;
        // FOR(i,0,N){
        //     cout << setw(2) << groups[i] << " ";
        // }cout <<  endl;
        // FOR(i,0,N){
        //     cout << setw(2) << costs[i] << " ";
        // }cout <<  endl;
        // cout << endl;
    }


    vull head(N,1e18);
    vi used(N,0);
    vi ans;

    FOR(i,0,N){
        used[groups[i]] = 1;
        head[groups[i]] = min(head[groups[i]],(ull)costs[i]);
    }

    FOR(i,0,N){
        if(used[i]){
            ans.pb(head[i]);
            // cout << i << " -> " << head[i] << endl;
        }
    }

    sort(ans.rbegin(),ans.rend());

    return ans[0]+ans[1]+L;

}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 10
• Subtask 3: 0 / 23
• Subtask 4: 0 / 18
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23