Submission #699538

#	Time	Username	Problem	Language	Result	Execution time	Memory
699538		Dan4Life	Election Campaign (JOI15_election_campaign)	C++17	0 / 100	1087 ms	16808 KiB

election_campaign

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define int ll // delete if causing problems
#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define mod(a) (a+MOD)%MOD
#define all(a) a.begin(), a.end()
#define sz(a) (int)a.size()

const int mxN = (int)3e5+10; // change when needed!
int n, m, a[mxN], b[mxN], c[mxN], vis[mxN];
vector<int> adj[mxN];

bool dfs(int s, int t, int p){
    if(s==t) return true;
    for(auto u : adj[s]){
        if(u==p) continue;
        if(dfs(u,t,s)){
            vis[u]++; return true;
        }
    }
    return false;
}

void solve()
{
    cin >> n; int ans = 0;
    for(int i = 1; i < n; i++){
        int a, b; cin >> a >> b;
        adj[a].pb(b), adj[b].pb(a);
    }
    cin >> m;
    for(int i = 0; i < m; i++){
        cin >> a[i] >> b[i] >> c[i];
    }
    for(int mask = 0; mask < (1<<m); mask++){
        int tot = 0;
        fill(vis,vis+n+1,0);
        for(int i = 0; i < m; i++)
            if((mask>>i)&1) tot+=c[i], vis[a[i]]++, dfs(a[i],b[i], -1);
        bool ok = 1;
        for(int i = 1; i <= n; i++)
            if(vis[i]>1) ok=0;
        if(ok) ans = max(ans, tot);
    }
    cout << ans;
}

int32_t main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);
    int t = 1; //cin >> t;
    while(t--) solve();
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 5
• Subtask 3: 0 / 5
• Subtask 4: 0 / 30
• Subtask 5: 0 / 10
• Subtask 6: 0 / 40