Submission #1117767

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117767		vjudge1	Paprike (COI18_paprike)	C++17	100 / 100	42 ms	30608 KiB

paprike

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define ld long double
#define endl '\n'
#define pb push_back
#define speedyboy ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define all(x) x.begin() , x.end()
#define F first
#define S second
#define pll pair<ll , ll>
#define pss pair<string , string>
#define YES cout << "YES" << endl;
#define NO cout << "NO" << endl;


const ll sz = 5e5 + 5 , INF = 1e18 , MOD = 998244353;
ll a[sz];
vector<ll> g[sz];
ll ans;

void dfs(ll n , ll u , ll m , ll &cursum){
    cursum = a[n];
    vector<ll> v;
    for(ll i : g[n]){
        if(i != u){
            ll changesum = 0;
            dfs(i , n , m , changesum);
            v.pb(changesum);
        }
    }
    sort(all(v));
    for(ll i = 0 ; i < v.size() ; i++){
        if(cursum + v[i] > m){
            ans++;
        }
        else{
            cursum += v[i];
        }
    }
    if(cursum > m){
        ans++;
    }
}

ll i , j , k;
void solve(){
    ll n , m;
    cin >> n >> m;
    for(i = 1 ; i <= n ; i++){
        cin >> a[i];
    }
    for(i = 1 ; i < n ; i++){
        ll u , v; cin >> u >> v;
        g[u].pb(v);
        g[v].pb(u);
    }
    ll cursum = 0;
    dfs(1 , -1 , m , cursum);
    cout << ans << endl;
}

signed main(){
    speedyboy;
    ll t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
}

Compilation message (stderr)

paprike.cpp: In function 'void dfs(long long int, long long int, long long int, long long int&)':
paprike.cpp:35:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |     for(ll i = 0 ; i < v.size() ; i++){
      |                    ~~^~~~~~~~~~

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