Submission #1126655

#	Time	Username	Problem	Language	Result	Execution time	Memory
1126655		TVSown	Cities (BOI16_cities)	C++20	0 / 100	538 ms	26692 KiB

cities

///*** Sown_Vipro ***///
/// ->NHI QUOC GIA<- ///

#include<bits/stdc++.h>
using namespace std;
//#pragma GCC optimize ("O3")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("popcnt")
#define F first
#define S second
#define pb push_back
#define pi pair<int, int>
#define pii pair<int, pair<int, int> >
#define FOR(i, a, b) for(int i = a; i <= b; ++i)
#define REP(i, a, b) for(int i = a; i >= b; --i)
#define all(s) s.begin(), s.end()
#define szz(s) int(s.size())
const string NAME = "sown";
const int N = 1e6 + 5, MAX = 1e6, oo = 1e9 + 5, MOD = 1e9 + 7;
void maxi(int &x, int y){ if(x < y) x = y; }
void mini(int &x, int y){ if(x > y) x = y; };
void add(int &x, int y){ x += y; x += MOD * (x < 0); x -= MOD * (x >= MOD); };
int n, k, m, res = oo;
int trace[N], spe[N];
long long d[N], dp[(1 << 5) + 5];
struct edge{
    int u, v, w;
} e[N];
vector<int> adj[N];
vector<int> s[(1 << 5) + 5];

int vst[N];
void dfs(int u){
    vst[u] = 1;
    for(int v : adj[u]){
        if(!vst[v]) dfs(v);
    }
}

void solve(){
    cin >> n >> k >> m;
    FOR(i, 1, k){
        int u; cin >> u;
        spe[i] = u;
        dp[u] = 0;
        s[(1 << i - 1)].pb(u);
    }

    FOR(i, 1, m){
        int u, v, w; cin >> u >> v >> w;
        e[i] = {u, v, w};
    }

    FOR(mask, 0, (1 << m) - 1){
        int sum = 0;
        FOR(i, 1, m){
            if(mask & (1 << i - 1)){
                adj[e[i].u].pb(e[i].v);
                adj[e[i].v].pb(e[i].u);
                sum += e[i].w;
            }
        }
//        cout << mask << " " << sum << "\n";
        dfs(spe[1]);
        int check = 1;
        FOR(i, 1, k) if(!vst[spe[i]]) check = 0;
        if(check){
            mini(res, sum);
//            if(sum == 21){
//                FOR(i, 1, m){
//                    if(mask & (1 << i - 1)) cout << e[i].u << " " << e[i].v << " " << e[i].w << "\n";
//                }
//                cout << sum << "\n";
//            }
        }
        FOR(u, 1, n){
            vst[u] = 0;
            adj[u].clear();
        }
    }
    cout << res;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    if(fopen((NAME + ".inp").c_str(), "r")){
        freopen((NAME + ".inp").c_str(), "r", stdin);
//        freopen((NAME + ".out").c_str(), "w", stdout);
    }
    int t = 1;
//    cin >> t;
    while(t--){
        solve();
    }
}

Compilation message (stderr)

cities.cpp: In function 'int main()':
cities.cpp:88:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |         freopen((NAME + ".inp").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 22
• Subtask 2: 0 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 23
• Subtask 5: 0 / 26