Submission #818424

#	Time	Username	Problem	Language	Result	Execution time	Memory
818424		oneloveforever	Designated Cities (JOI19_designated_cities)	C++14	7 / 100	196 ms	44784 KiB

designated_cities

#include<bits/stdc++.h>
using namespace std;
#define int long long
const int inf=1e9+7;
int n,q;
template <typename T>
bool minimize(T &a,T b)
{
    if(a>b)
    {
        a=b;
        return true;
    }
    return false;
}
struct edge
{
    int x,value_x,value_y;
    edge(int _x=0,int _value_x=0,int _value_y=0)
    {
        x=_x,value_x=_value_x,value_y=_value_y;
    }
};
vector<vector<edge> >a;
struct SUB1
{
    int n;
    vector<vector<int> >dp;
    SUB1(int _n=0)
    {
        n=_n;
        dp.resize(n+7,vector<int>(2));
    }
    void dfs(int x,int par)
    {
        dp[x][0]=0;
        dp[x][1]=inf;
        for(edge need:a[x])
        {
            int node=need.x;
            int value_x=need.value_x;
            int value_y=need.value_y;
            if(node==par)continue;
            dfs(node,x);
            dp[x][1]=dp[x][1]+dp[node][0]+value_x;
            minimize(dp[x][1],dp[node][1]+dp[x][0]+value_y);
            dp[x][0]+=dp[node][0]+value_x;
        }
        minimize(dp[x][1],dp[x][0]);
    }
    void calc()
    {
        dfs(1,0);
        cout<<dp[1][1];
    }
};


signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin>>n;
    a.resize(n+7);
    for(int i=1;i<=n-1;i++)
    {
        int x,y,value_x,value_y;
        cin>>x>>y>>value_x>>value_y;
        a[x].push_back({y,value_x,value_y});
        a[y].push_back({x,value_y,value_x});
    }
    int q;
    cin>>q;
    if(q==1)
    {
        int x;
        cin>>x;
        if(x==1)
        {
            SUB1 s(n);
            s.calc();
        }
    }
}

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