Submission #1117620

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117620		vjudge1	Paprike (COI18_paprike)	C++17	0 / 100	32 ms	1872 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;
}
void solve(){
    ll n,k;
    cin >> n >> k;
    ll a[n + 1];
    for(int i = 1; i <= n; i++){
        cin >> a[i];
    }
    ll x,y;
    ll sum[n + 1];
    for(int i = 1; i <= n; i++){
        sum[i] = 0;
    }
    ll cnt = 0;
    for(int i = 0; i < n - 1; i++){
        cin >> x >> y;
     //   cout << sum[x] << " " << sum[y] << endl;
        ll s;
        if(i == 0){
            s = 0;
        }
        else{
            if(sum[x] > 0){
                s = sum[x];
            }
            else{
                s = sum[y];
            }
        }
        if(s + a[x] + a[y] <= k){
            sum[x] += a[x] + a[y];
            sum[y] += a[x] + a[y];
        }
        else{
            cnt++;
        }
       // cout << cnt << endl;
    }
    cout << cnt << endl;
}
int main(){
    fast;
    ll t = 1;
   // cin >> t;  
    while(t--){
        solve();
    }
    return 0;
}

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