Submission #952993

#	Time	Username	Problem	Language	Result	Execution time	Memory
952993		LucaIlie	Designated Cities (JOI19_designated_cities)	C++17	9 / 100	363 ms	39412 KiB

designated_cities

#include <bits/stdc++.h>

using namespace std;

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

    int other( int p ) {
        return u ^ v ^ p;
    }

    int cost( int p ) {
        if ( p == u )
            return d;
        return c;
    }
};

const int MAX_N = 2e5;
int parent[MAX_N + 1];
long long cost[MAX_N + 1], parentEdgeCost[MAX_N + 1];
long long sumCost;
edge edges[MAX_N];
vector<int> adj[MAX_N + 1];

void dfs( int u, int p ) {
    for ( int e: adj[u] ) {
        int v = edges[e].other( u ), c = edges[e].cost( u ), d = (edges[e].c ^ edges[e].d ^ c);
        if ( v == p )
            continue;

        parent[v] = u;
        cost[v] = cost[u] + d;
        sumCost += c;

        dfs( v, u );
    }
}

int main() {
    int n;
    long long sumTotal = 0;

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

    int q, e;
    cin >> q >> e;

    sumCost = 0;
    dfs( 1, 0 );

    int r = 1;
    for ( int v = 2; v <= n; v++ ) {
        if ( cost[v] > cost[r] )
            r = v;
    }

    sumCost = 0;
    cost[r] = 0;
    dfs( r, 0 );

    long long maxx = 0;
    for ( int v = 1; v <= n; v++ ) {
        if ( cost[v] > maxx )
            maxx = cost[v];
    }

    cout << sumTotal - (sumCost + maxx);

    return 0;
}

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