제출 #414993

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
414993		KalasLavas	Dreaming (IOI13_dreaming)	C++14	100 / 100	101 ms	18336 KiB

dreaming

#include <bits/stdc++.h>
#include "dreaming.h"
using namespace std;
mt19937 rng(chrono::system_clock::now().time_since_epoch().count());
//#undef LOCALKL
#define IO \
ios_base::sync_with_stdio(0);(cin).tie(0);(cout).tie(0)
#define y1 y1_
#define prev prev_
#define all(a) (a).begin(),(a).end()
#define pb push_back
#define eb emplace_back
#define F first
#define S second
#ifdef LOCALKL
#define cerr cerr<<"\33[1;32m"
#define cout cout<<"\33[0m"
#else
#define endl '\n'
#define cerr if(1){}else cerr
#endif
#define OK cout<<"OK\n"<<endl;
#define setpre(k) fixed<<setprecision(k)
#define mmset(k,y) memset(k,y,sizeof(k))
#define sz(x) ((int)(x).size())
using pii = pair<int,int>;
using pll = pair<long long,long long>;
using ull = unsigned long long;
using intt = long long;
using ll = long long;
using ld = long double;

const ll m9 = 998244353;
const ll m7 = 1000000007;
const ll m18 = 1000000000000000000;
const ll i127 = 2139062143;
const ll l127 = 9187201950435737471;
int x,y;
bool fl;
vector<pii>g[100001];
pii mx;
int res, ans;
int d[100001];
void dfs(int v, bool reset)
{
    // cerr<<(reset?"1> ":"2> ")<<v<<endl;
    for(auto u : g[v])
    {
        if(d[u.F]==-1)
        {
            d[u.F] = d[v] + u.S;
            mx = max(make_pair(d[u.F], u.F), mx);
            dfs(u.F, reset);
        }
    }
    if(reset) d[v]=-1;
}

int dfs1(int v, int par, int dis)
{
    if(v==y)
    {
        fl=1;
        return 0;
    }
    int cdis = 0;
    for(auto u : g[v])
        if(u.F!=par)
        {
            cdis = dfs1(u.F, v, dis+u.S)+u.S;
            if(fl)
            {
                res = min(res, max(cdis, dis));
                ans = max(ans, cdis+dis);
                return cdis;
            }
        }
    return 0;
}
vector<int>c;
int travelTime(int n, int m, int L, int A[], int B[], int T[]) {
    memset(d, -1, sizeof(d));
    for(int i=0;i<m;i++)
    {
        g[A[i]].emplace_back(B[i],T[i]);
        g[B[i]].emplace_back(A[i],T[i]);
    }
    for(int i=0;i<n;i++)
        if(d[i]==-1)
        {
            d[i]=0;
            mx={0,i};
            dfs(i, 1);
            x = mx.S;
            
            // cerr<<x<<endl;
            
            mx={0,x};
            d[x]=0;
            dfs(x, 0);
            y = mx.S;
            
            fl=0;
            res = INT_MAX;
            dfs1(x, -1, 0);
            
            // cerr<<x<<' '<<y<<' '<<res<<endl;
            if(x==y) res=0;
            c.emplace_back(res);
        }
    sort(all(c), greater<int>());
    if(m<n-2)
        ans = max(ans, max(c[0]+c[1]+L, c[1]+c[2]+L+L));
    else if(m==n-2)
        ans = max(ans, c[0]+c[1]+L);
    return ans;
}

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