Submission #947914

#	Time	Username	Problem	Language	Result	Execution time	Memory
947914		danikoynov	Designated Cities (JOI19_designated_cities)	C++14	7 / 100	243 ms	37148 KiB

designated_cities

#include<bits/stdc++.h>
#define endl '\n'

using namespace std;
typedef long long ll;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}

const int maxn = 2e5 + 10;

struct edge
{
    int v, u;
    ll c, d;

    edge(int _v = 0, int _u = 0, ll _c = 0, ll _d = 0)
    {
        v = _v;
        u = _u;
        c = _c;
        d = _d;
    }
}edges[maxn];


int n;
vector < pair < int, int > > adj[maxn];

ll sum_all = 0;
void input()
{
    cin >> n;
    for (int i = 1; i < n; i ++)
    {
        cin >> edges[i].v >> edges[i].u >> edges[i].c >> edges[i].d;
        adj[edges[i].v].push_back({edges[i].u, i});
        adj[edges[i].u].push_back({edges[i].v, i});
        sum_all += edges[i].c + edges[i].d;
    }
}

const ll inf = 1e18;

ll single = 0;
ll sub[maxn];
void calc(int v, int p)
{
    for (pair < int, int > nb : adj[v])
    {
        int u = nb.first;
        if (u == p)
            continue;

        calc(u, v);
        if (v == edges[nb.second].v)
            sub[v] += edges[nb.second].d; //cout << "edge " << v << " : " << u << " : " << edges[nb.second].d << endl;
        else
            sub[v] += edges[nb.second].c;
        sub[v] += sub[u];
    }
    //cout << "calc " << v << " " << sub[v] << endl;
}

void single_dfs(int v, int p, ll val)
{
    single = max(single, val);
    ///cout << v << " : " << val << endl;
    for (pair < int, int > nb : adj[v])
    {
        int u = nb.first;
        if (u == p)
            continue;

        ll cur;
        if (v == edges[nb.second].v)
            cur = edges[nb.second].c - edges[nb.second].d;
        else
            cur = edges[nb.second].d - edges[nb.second].c;

        single_dfs(u, v, val + cur);
    }
}

void solve_single()
{
    calc(1, -1);
    single_dfs(1, -1, sub[1]);

    int q;
    cin >> q;
    int e;
    cin >> e;
    cout << sum_all - single << endl;
}
void solve()
{
    input();
    solve_single();

}

int main()
{
    speed();
    int t = 1;
    ///cin >> t;
    while(t --)
        solve();
    return 0;
}

• Subtask 1: 0 / 6
• Subtask 2: 7 / 7
• Subtask 3: 0 / 9
• Subtask 4: 0 / 17
• Subtask 5: 0 / 17
• Subtask 6: 0 / 44