Submission #1128594

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128594		cbnhtmanh	Cities (BOI16_cities)	C++20	100 / 100	2596 ms	39792 KiB

cities

#include <bits/stdc++.h>
#define fi(i, a, b) for( int i = a; i <= b; i++ )
#define fid(i, a, b) for( int i = a; i >= b; i-- )
#define getbit(x, i) ((x>>i)&1)
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define pli pair<ll,int>
#define pll pair<ll,ll>
#define st first
#define nd second
#define mp make_pair
#define HTManh ""
#define maxn 100009
#define endl '\n'
using namespace std;

int n, k, m;
int imp[9];
vector<pii> a[100009];
vector<int> tt[1<<5];

ll L[1<<5][100009];

void dij(int mask)
{
    priority_queue<pll> q;
    fi(i,1,n)
    {
        if (L[mask][i] < 1e18) q.push({-L[mask][i], i});
    }
    while(q.size())
    {
        int u = q.top().nd;
        q.pop();
        for(int x: tt[mask]) L[mask^x][u] = min(L[mask^x][u], L[mask][u] + L[x][u]);
        for(pii tg: a[u])
        {
            int v = tg.st, kc = tg.nd;
            if (L[mask][v] > L[mask][u] + kc)
            {
                L[mask][v] = L[mask][u] + kc;
                q.push({-L[mask][v], v});
            }
        }
    }
}

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(NULL); cout.tie(NULL);
	if (fopen(HTManh".inp", "r"))
    {
        freopen(HTManh".inp", "r", stdin);
        freopen(HTManh".out", "w", stdout);
    }

    cin >> n >> k >> m;
    fi(i,1,k) cin >> imp[i];
    fi(i,1,m)
    {
        int x, y, z;
        cin >> x >> y >> z;
        a[x].pb({y, z});
        a[y].pb({x, z});
    }
    fi(x,1,(1<<k)-1) fi(y,1,(1<<k)-1) if ((x^y) == x+y) tt[x].pb(y);
//    fi(x,1,(1<<k)-1) fi(y,1,(1<<k)-1) if ((x^y) == x+y) cout << x << " " << y << endl;
    fi(x,1,(1<<k)-1) fi(i,1,n) L[x][i] = 1e18;
    fi(i,1,k) L[1<<(i-1)][imp[i]] = 0;
    fi(x,1,(1<<k)-1) dij(x);
//    fi(x,1,(1<<k)-1)
//    {
//        fi(i,1,n) cout << L[x][i] << " ";
//        cout << endl;
//    }
    ll res = 1e18;
    fi(i,1,n) res = min(res, L[(1<<k)-1][i]);
    cout << res << endl;
}

Compilation message (stderr)

cities.cpp: In function 'int main()':
cities.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen(HTManh".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
cities.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen(HTManh".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 14 / 14
• Subtask 3: 15 / 15
• Subtask 4: 23 / 23
• Subtask 5: 26 / 26