Submission #701714

#	Time	Username	Problem	Language	Result	Execution time	Memory
701714		scottchou	Deblo (COCI18_deblo)	C++17	45 / 90	1087 ms	11412 KiB

deblo

#include<bits/stdc++.h>
using namespace std;
int const N = 1e5 + 5;
typedef long long LL;
int a[N];
vector<int> graph[N];
int val[N];
void dfs(int x, int d = 0, int fa = -1){
    d = d ^ a[x];
    val[x] = d;
    for(auto i : graph[x]){
        if(i == fa) 
            continue;
        dfs(i, d, x);
    }
}
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;
    int u, v;
    LL sum = 0;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        sum += a[i];
    }
    for(int i = 0; i < n - 1; i++){
        cin >> u >> v;
        graph[u].push_back(v);
        graph[v].push_back(u);        
    }
    LL ans = 0;
    for(int i = 1; i <= n; i++){
        dfs(i);
        for(int j = 1; j <= n; j++){
            if(i != j)
                ans += val[j];
        }
    }
    cout << ans / 2 + sum << '\n';
}

• Subtask 1: 45 / 90