Submission #1117709

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117709		vjudge1	Paprike (COI18_paprike)	C++17	13 / 100	37 ms	12112 KiB

paprike

#include "bits/stdc++.h"
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define pb push_back
#define in insert
#define F first
#define S second
#define vll vector<ll>
#define all(v) v.begin(),v.end()
#define endl '\n'
#define pii pair<ll,ll>
using namespace std;
const ll INF =1e18, mod = 1e9 + 7, N = 1e5 + 5;
ll gcd(ll a, ll b){
    if(b == 0){
        return a;
    }
    return gcd(b, a % b);
}
ll lcm(ll a, ll b){
    return (a / gcd(a,b)) * b;
}
vector<ll>g[N];
ll used[N];
ll sum = 0;
ll n,k;
ll a[N];
ll cnt = 0;
void dfs(ll s){
    used[s] = 1;
    
    
    for(auto i : g[s]){
     //   cout << s << " " << sum << endl;
       // cout << endl;

        if(!used[i]){
            if(a[i] + sum <= k){
                sum += a[i];            
            }
            else{
                cnt++;
               // cout << s << " " << i << endl;
               // cout << endl;
                sum = a[i];
            }
            dfs(i);
        }
    }
}
void solve(){
    cin >> n >> k;
    
    for(int i = 1; i <= n; i++){
        cin >> a[i];
    }
    ll x,y;
    for(int i = 0; i < n - 1; i++){
        cin >> x >> y;
        g[x].pb(y);
        g[y].pb(x);
    }
    sum = a[1];
    dfs(1);
    cout << cnt <<endl;
}
int main(){
    fast;
    ll t = 1;
   // cin >> t;  
    while(t--){
        solve();
    }
    return 0;
}

• Subtask 1: 0 / 11
• Subtask 2: 13 / 13
• Subtask 3: 0 / 27
• Subtask 4: 0 / 49