Submission #407544

#	Time	Username	Problem	Language	Result	Execution time	Memory
407544		nguot	Commuter Pass (JOI18_commuter_pass)	C++14	24 / 100	147 ms	19244 KiB

commuter_pass

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r){return l+rng()%(r-l+1);}
#define fasty ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define fori(x,a,b) for (int x=a;x<=b;x++)
#define ford(x,a,b) for (int x=a;x>=b;x--)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<int,int>
#define all(a) a.begin(),a.end()
#define reset(f, x) memset(f, x, sizeof(f))
#define getbit(x,i) ((x>>i)&1)
#define batbit(x,i) (x|(1ll<<i))
#define tatbit(x,i) (x&~(1<<i))
#define gg exit(0);

const int maxn = 2e5 + 10;
int n,m,s,t,x,y;
vector<ii> ke[maxn];
int f[310][310];

void sub3()
{
    priority_queue<ii,vector<ii>,greater<ii> > h;
    fori(i,1,n)
    {
        fori(j,1,n) f[i][j] = 1e15;
        f[i][i] = 0;
        h.push({0,i});
        while(!h.empty())
        {
            ii u = h.top();
            h.pop();
            int umin = u.se,dmin = u.fi;
            forv(v,ke[umin]) if(f[i][v.fi] > dmin + v.se)
            {
                f[i][v.fi] = dmin + v.se;
                h.push({f[i][v.fi],v.fi});
            }
        }
    }

    int kq = 1e15;
    fori(i,1,n) fori(j,1,n)
    {
        if(f[s][i] + f[i][j] + f[j][t]==f[s][t])
        kq=min({kq,f[x][i]+f[j][y],f[x][j]+f[i][y]});
    }
    cout<<min(kq,f[x][y]);
}
main()
{
    //freopen("task.inp","r",stdin);
    fasty;
   cin>>n>>m;
   cin>>s>>t>>x>>y;
   fori(i,1,m)
   {
       int u,v,c;cin>>u>>v>>c;
       ke[u].pb({v,c}),ke[v].pb({u,c});
   }
   if(n<=300) sub3();
}
/*
chon 1 dg di ngan nhat tu s->t,cho tat cac canh tren dg di nay = 0
sao cho dg di ngan nhat tu u->v la MIN
*/
//https://oj.uz/problem/view/JOI18_commuter_pass

Compilation message (stderr)

commuter_pass.cpp:56:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   56 | main()
      | ^~~~

• Subtask 1: 0 / 16
• Subtask 2: 0 / 15
• Subtask 3: 24 / 24
• Subtask 4: 0 / 45