Submission #710021

#	Time	Username	Problem	Language	Result	Execution time	Memory
710021		victor_gao	Designated Cities (JOI19_designated_cities)	C++17	0 / 100	3 ms	5044 KiB

designated_cities

//#pragma GCC optimize("Ofast,unroll-loops,O3")
//#pragma GCC optimize("avx,avx2,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,fma,tune=native")
#include<bits/stdc++.h>
//#include<bits/extc++.h>
//#pragma pack(1)
#define fast ios::sync_with_stdio(0); cin.tie(0);
#define int long long
#define pii pair<int,int>
#define x first
#define y second
#define N 200015
using namespace std;
//using namespace __gnu_pbds;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//typedef tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update> order_multiset;
//typedef tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> order_set;
int n,dp[N],fa[N],ans[N],mx[N],pos[N],total=0;
vector<int>g[N];
vector<int>leaf;
map<pii,int>cost;
void dfs1(int p,int lp){
    if (g[p].size()==1){
        leaf.push_back(p);
        pos[p]=p;
        return;
    }
    for (auto i:g[p]){
        if (i!=lp){
            dfs1(i,p);
            int cs=mx[i]+cost[{i,p}]+cost[{p,i}];
            dp[p]=dp[p]+dp[i]+cost[{i,p}];
            if (mx[p]<cs){
                mx[p]=cs;
                pos[p]=pos[i];
            }
        }
    }
}
void dfs2(int p,int lp){
    dp[p]=(dp[p]+dp[lp]+cost[{lp,p}]);
    ans[1]=min(ans[1],total-dp[p]);
    for (auto i:g[p]){
        if (i!=lp){
            dp[p]=dp[p]-dp[i]-cost[{i,p}];
            dfs2(i,p);
            dp[p]=dp[p]+dp[i]+cost[{i,p}];
        }
    }
    dp[p]=(dp[p]-dp[lp]-cost[{lp,p}]);
}
signed main(){
    fast
    cin>>n;
    for (int i=0;i<=n;i++)
        ans[i]=1e18;
    for (int i=1;i<n;i++){
        int a,b,c,d; cin>>a>>b>>c>>d;
        total=(total+c+d);
        g[a].push_back(b);
        g[b].push_back(a);
        cost[{a,b}]=c; cost[{b,a}]=d;
    }
    dfs1(1,0);
    dfs2(1,0);
    int q; cin>>q;
    while (q--){
        int c; cin>>c;
        cout<<ans[c]<<'\n';
    }
}

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