Submission #895178

#	Time	Username	Problem	Language	Result	Execution time	Memory
895178		Irate	Traffic (IOI10_traffic)	C++14	0 / 100	1 ms	4444 KiB

traffic

#include<bits/stdc++.h>
using namespace std;
vector<vector<int>>G;
vector<long long>sz, val, res;
int n;
long long sum = 0;
void dfs(int node, int par){
    sz[node] = val[node];
    for(int &v : G[node]){
        if(v != par){
            dfs(v, node);
            sz[node] += sz[v];
        }
    }
    long long sub_sum = 0;
    for(int &v : G[node]){
        res[node] = max(res[node], sz[v]);
        sub_sum += sz[v];
    }
    res[node] = max(res[node], sum - sub_sum);
}
int LocateCentre(int N, int P[], int S[], int D[]){
    int n = N;
    G.resize(n);
    sz.resize(n);
    res.resize(n);
    val.resize(n);
    for(int i = 0;i < n;++i){
        val[i] = P[i];
        sum += P[i];
    }
    for(int i = 0;i < n - 1;++i){
        G[S[i]].push_back(D[i]);
        G[D[i]].push_back(S[i]);
    }
    dfs(0, 0);
    long long mn = 1e18, id = -1;
    for(int i = 0;i < n;++i){
        if(res[i] < mn){
            mn = res[i];
            id = i;
        }
    }
    return id;
}
// int main(){
//     ios_base::sync_with_stdio(0);
//     cin.tie(0);
//     int n;
//     cin >> n;
//     vector<int>P(n), S(n - 1), D(n - 1);
//     for(int i = 0;i < n;++i){
//         cin >> P[i];
//     }
//     for(int i = 0;i < n - 1;++i){
//         cin >> S[i] >> D[i];
//     }
//     cout << LocateCentre(n, P, S, D);
// }

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25