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답안 #371607

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
371607 2021-02-27T02:51:04 Z Dymo Olympic Bus (JOI20_ho_t4) C++14
100 / 100
 584 ms 13952 KB 
#pragma GCC optimize("Ofast")
#pragma GCC optimization("unroll-loops, no-stack-protector")
#pragma GCC target("avx,avx2,fma")

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

#define ll  long long
#define ull  long long
#define pll pair<ll,ll>
#define ff first
#define ss second
#define pb push_back
//#define endl "\n"
const ll maxn =2e5+30;
const ll mod=1e9+7 ;
const ll base=1e18;


ll x[maxn];
ll y[maxn];
ll c[maxn];
ll d[maxn];
vector<ll> adj[maxn][2];
ll dp[maxn][6];
ll pre[maxn];
ll n, m ;
bool dd[maxn];
bool in[maxn];

void dosth(ll p,ll type,ll ta,ll rc,ll t)
{
    /* priority_queue<pll,vector<pll>,greater<pll>> q;
     for (int i=1; i<=n; i++)
     {
         dp[i][type]=base;
     }
     dp[p][type]=0;
     q.push(make_pair(dp[p][type],p));
     while (!q.empty())
     {
         auto p=q.top();
         q.pop();
         ll u=p.ss;
         if (dp[u][type]!=p.ff)
             continue;
         for (auto to:adj[u][ta])
         {
             if (u==rc&&to==t)
                 continue;
             ll nxt=x[to]+y[to]-u;
             if (dp[nxt][type]>dp[u][type]+c[to])
             {
                 dp[nxt][type]=dp[u][type]+c[to];
                 q.push(make_pair(dp[nxt][type],nxt));
                 pre[nxt]=to;
             }
         }
     }*/
    for (int i=1; i<=n; i++)
    {
        dp[i][type]=base;
        in[i]=0;
    }
    dp[p][type]=0;
    for (int i=1; i<=n; i++)
    {
        ll min_d=base;
        ll minnd=1;
        for (int i=1; i<=n; i++)
        {
            if (in[i])
                continue;
            if (dp[i][type]<=min_d)
            {
                min_d=dp[i][type];
                minnd=i;
            }
        }
        in[minnd]=1;
        for (auto to:adj[minnd][ta])
        {
            if (minnd==rc&&to==t)
                continue;
            ll nxt= x[to]+y[to]-minnd;
            if (dp[nxt][type]>dp[minnd][type]+c[to])
            {
                dp[nxt][type]=dp[minnd][type]+c[to];
                pre[nxt]=to;
            }

        }


    }
}
ll ans=base;
void dosth1()
{
    dosth(1,0,0,-1,-1);
    ll nw=n;
    while (nw!=1)
    {
        //  cout <<nw<<" "<<pre[nw]<<endl;
        dd[pre[nw]]=1;
        //   cout <<pre[nw]<<endl;
        nw=x[pre[nw]]+y[pre[nw]]-nw;
    }
    dosth(1,1,1,-1,-1);
    dosth(n,2,0,-1,-1);
    dosth(n,3,1,-1,-1);
    ans=min(ans,dp[n][0]+dp[n][1]);
    for (int i=1; i<=m; i++)
    {
        if (dd[i])
        {
            ll h1=x[i];
            ll h2=y[i];
            adj[h2][0].pb(i);
            swap(x[i],y[i]);
            dosth(1,4,0,h1,i);
            ll h=dp[n][4]+d[i];
            dosth(n,4,0,h1,i);
            h+=dp[1][4];
            swap(x[i],y[i]);
            adj[h2][0].pop_back();


            ans=min(ans,h);
        }
        else
        {

            ans=min(ans,dp[n][0]+dp[x[i]][1]+dp[y[i]][2]+c[i]+d[i]);
            /*  if (i==2)
              {
                  cout <<min(dp[n][0],dp[y[i]][0]+dp[x[i]][3]+c[i])+dp[x[i]][1]+dp[y[i]][2]+c[i]+d[i]<<endl;
              }*/
            /*  if (min(dp[n][0],dp[y[i]][0]+dp[x[i]][3])+dp[x[i]][1]+dp[y[i]][2]+c[i]+d[i]==1)
              {
                  cout <<i<<endl;
              }*/
        }
    }
}
void change()
{
    for (int i=1; i<=n; i++)
    {
        adj[i][0].clear();
        adj[i][1].clear();
    }
    for (int i=1; i<=m; i++)
    {
        if (x[i]==n)
            x[i]=1;
        else if (x[i]==1)
            x[i]=n;
        if (y[i]==n)
            y[i]=1;
        else if (y[i]==1)
            y[i]=n;
        // cout <<x[i]<< " "<<y[i]<<endl;
        adj[x[i]][0].pb(i);
        adj[y[i]][1].pb(i);
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    if (fopen("t.inp","r"))
    {
        freopen("test.inp","r",stdin);
        freopen("test.out","w",stdout);
    }

    cin>> n>> m;
    for (int i=1; i<=m; i++)
    {
        cin>>x[i]>> y[i]>>c[i]>> d[i ];
        adj[x[i]][0].pb(i);
        adj[y[i]][1].pb(i);
    }
    dosth(1,0,0,-1,-1);
    dosth(n,1,0,-1,-1);
    // cout <<dp[n][0]<<" "<<dp[1][1]<<endl;
    if (dp[n][0]!=base&&dp[1][1]!=base)
    {
        //  cout <<"?"<< " "<<endl;
        dosth1();
        change();
        dosth1();
        if (ans>=base)
        {
            ans=-1;
        }
        cout <<ans<<endl;

    }
    else if (dp[n][0]!=base)
    {
        dosth1();
        if (ans>=base)
        {
            ans=-1;
        }
        cout <<ans<<endl;
    }
    else if (dp[1][1]!=base)
    {
        change();
        dosth1();
        if (ans>=base)
        {
            ans=-1;
        }
        cout <<ans<<endl;
    }
    else
    {
        dosth(1,0,0,-1,-1);
        dosth(1,1,1,-1,-1);
        dosth(n,2,0,-1,-1);
        dosth(n,3,1,-1,-1);
        ll ans=dp[n][0]+dp[n][1];
        for (int i=1; i<=m; i++)
        {
            ans=min(ans,dp[y[i]][0]+dp[x[i]][3]+dp[y[i]][2]+dp[x[i]][1]+d[i]+2*c[i]);
        }
        if (ans>=base)
        {
            ans=-1;
        }
        cout <<ans;
    }





}

Compilation message

ho_t4.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    2 | #pragma GCC optimization("unroll-loops, no-stack-protector")
      | 
ho_t4.cpp: In function 'int main()':
ho_t4.cpp:175:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  175 |         freopen("test.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
ho_t4.cpp:176:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  176 |         freopen("test.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 9836 KB Output is correct
2 Correct 8 ms 9836 KB Output is correct
3 Correct 13 ms 9836 KB Output is correct
4 Correct 15 ms 9836 KB Output is correct
5 Correct 8 ms 9836 KB Output is correct
6 Correct 8 ms 9836 KB Output is correct
7 Correct 7 ms 9856 KB Output is correct
8 Correct 7 ms 9836 KB Output is correct
9 Correct 8 ms 9836 KB Output is correct
10 Correct 108 ms 9964 KB Output is correct
11 Correct 128 ms 9964 KB Output is correct
12 Correct 119 ms 9836 KB Output is correct
13 Correct 8 ms 9836 KB Output is correct
14 Correct 11 ms 9836 KB Output is correct
15 Correct 10 ms 9836 KB Output is correct
16 Correct 11 ms 9836 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 41 ms 12908 KB Output is correct
2 Correct 44 ms 13548 KB Output is correct
3 Correct 41 ms 13824 KB Output is correct
4 Correct 11 ms 9964 KB Output is correct
5 Correct 14 ms 9836 KB Output is correct
6 Correct 8 ms 9836 KB Output is correct
7 Correct 8 ms 9836 KB Output is correct
8 Correct 7 ms 9836 KB Output is correct
9 Correct 33 ms 13164 KB Output is correct
10 Correct 33 ms 13292 KB Output is correct
11 Correct 40 ms 13292 KB Output is correct
12 Correct 37 ms 13292 KB Output is correct
13 Correct 38 ms 13164 KB Output is correct
14 Correct 39 ms 13292 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 9836 KB Output is correct
2 Correct 8 ms 9836 KB Output is correct
3 Correct 30 ms 12140 KB Output is correct
4 Correct 8 ms 9836 KB Output is correct
5 Correct 34 ms 12908 KB Output is correct
6 Correct 7 ms 9836 KB Output is correct
7 Correct 7 ms 9836 KB Output is correct
8 Correct 29 ms 12780 KB Output is correct
9 Correct 29 ms 12780 KB Output is correct
10 Correct 31 ms 12908 KB Output is correct
11 Correct 38 ms 12908 KB Output is correct
12 Correct 36 ms 12908 KB Output is correct
13 Correct 7 ms 9836 KB Output is correct
14 Correct 7 ms 9836 KB Output is correct
15 Correct 7 ms 9836 KB Output is correct
16 Correct 7 ms 9836 KB Output is correct
17 Correct 7 ms 9836 KB Output is correct
18 Correct 7 ms 9836 KB Output is correct
19 Correct 31 ms 12908 KB Output is correct
20 Correct 32 ms 12908 KB Output is correct
21 Correct 31 ms 12908 KB Output is correct
22 Correct 31 ms 12908 KB Output is correct

Subtask #4
63.0 / 63.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 9836 KB Output is correct
2 Correct 8 ms 9836 KB Output is correct
3 Correct 13 ms 9836 KB Output is correct
4 Correct 15 ms 9836 KB Output is correct
5 Correct 8 ms 9836 KB Output is correct
6 Correct 8 ms 9836 KB Output is correct
7 Correct 7 ms 9856 KB Output is correct
8 Correct 7 ms 9836 KB Output is correct
9 Correct 8 ms 9836 KB Output is correct
10 Correct 108 ms 9964 KB Output is correct
11 Correct 128 ms 9964 KB Output is correct
12 Correct 119 ms 9836 KB Output is correct
13 Correct 8 ms 9836 KB Output is correct
14 Correct 11 ms 9836 KB Output is correct
15 Correct 10 ms 9836 KB Output is correct
16 Correct 11 ms 9836 KB Output is correct
17 Correct 41 ms 12908 KB Output is correct
18 Correct 44 ms 13548 KB Output is correct
19 Correct 41 ms 13824 KB Output is correct
20 Correct 11 ms 9964 KB Output is correct
21 Correct 14 ms 9836 KB Output is correct
22 Correct 8 ms 9836 KB Output is correct
23 Correct 8 ms 9836 KB Output is correct
24 Correct 7 ms 9836 KB Output is correct
25 Correct 33 ms 13164 KB Output is correct
26 Correct 33 ms 13292 KB Output is correct
27 Correct 40 ms 13292 KB Output is correct
28 Correct 37 ms 13292 KB Output is correct
29 Correct 38 ms 13164 KB Output is correct
30 Correct 39 ms 13292 KB Output is correct
31 Correct 12 ms 9836 KB Output is correct
32 Correct 8 ms 9836 KB Output is correct
33 Correct 30 ms 12140 KB Output is correct
34 Correct 8 ms 9836 KB Output is correct
35 Correct 34 ms 12908 KB Output is correct
36 Correct 7 ms 9836 KB Output is correct
37 Correct 7 ms 9836 KB Output is correct
38 Correct 29 ms 12780 KB Output is correct
39 Correct 29 ms 12780 KB Output is correct
40 Correct 31 ms 12908 KB Output is correct
41 Correct 38 ms 12908 KB Output is correct
42 Correct 36 ms 12908 KB Output is correct
43 Correct 7 ms 9836 KB Output is correct
44 Correct 7 ms 9836 KB Output is correct
45 Correct 7 ms 9836 KB Output is correct
46 Correct 7 ms 9836 KB Output is correct
47 Correct 7 ms 9836 KB Output is correct
48 Correct 7 ms 9836 KB Output is correct
49 Correct 31 ms 12908 KB Output is correct
50 Correct 32 ms 12908 KB Output is correct
51 Correct 31 ms 12908 KB Output is correct
52 Correct 31 ms 12908 KB Output is correct
53 Correct 42 ms 12876 KB Output is correct
54 Correct 50 ms 12908 KB Output is correct
55 Correct 46 ms 12908 KB Output is correct
56 Correct 12 ms 9836 KB Output is correct
57 Correct 11 ms 9836 KB Output is correct
58 Correct 302 ms 12268 KB Output is correct
59 Correct 316 ms 12780 KB Output is correct
60 Correct 382 ms 12908 KB Output is correct
61 Correct 254 ms 12888 KB Output is correct
62 Correct 321 ms 12908 KB Output is correct
63 Correct 385 ms 12908 KB Output is correct
64 Correct 464 ms 13036 KB Output is correct
65 Correct 485 ms 13196 KB Output is correct
66 Correct 584 ms 13296 KB Output is correct
67 Correct 24 ms 13664 KB Output is correct
68 Correct 32 ms 13804 KB Output is correct
69 Correct 31 ms 13804 KB Output is correct
70 Correct 40 ms 13932 KB Output is correct
71 Correct 38 ms 13804 KB Output is correct
72 Correct 39 ms 13804 KB Output is correct
73 Correct 40 ms 13932 KB Output is correct
74 Correct 39 ms 13952 KB Output is correct