Submission #569282

#	Time	Username	Problem	Language	Result	Execution time	Memory
569282		jcelin	Paprike (COI18_paprike)	C++14	100 / 100	76 ms	25056 KiB

paprike

#include <bits/stdc++.h>
using namespace std;


typedef long long ll;
typedef long double ld;
typedef unsigned int ui;

#define ii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vii vector<ii>
#define vll vector<ll>
#define vpll vector<pll>
#define matrix vector<vi>
#define matrixLL vector<vLL>
#define vs vector<string>
#define vui vector<ui>
#define msi multiset<int>
#define mss multiset<string>
#define si set<int>
#define ss set<string>
#define PB push_back
#define PF push_front
#define PPB pop_back
#define PPF pop_front
#define X first
#define Y second
#define MP make_pair
#define FOR(i, a, b) for (int i = int(a); i < int(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define all(x) (x).begin(), (x).end()

const int dx[] = {-1, 1, 0, 0};
const int dy[] = {0, 0, -1, 1};
const int dxx[] = {-1, 1, 0, 0, 1, 1, -1, -1};
const int dyy[] = {0, 0, -1, 1, -1, 1, -1, 1};
const string abc="abcdefghijklmnopqrstuvwxyz";
const string ABC="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const ld pi = 3.14159265;
const int mod = 1e9 + 7;
const int MOD = 1e9 + 7;
const int MAXN = 3e5 + 7;
const int inf = mod;
const ll INF = 1e18;
const ll zero = ll(0);
const int logo = 20;
const int off = 1 << logo;
const int trsz = off << 1;

ll s[MAXN];
ll val[MAXN], n, k;
vi g[MAXN];

bool cmp(int a, int b){
	return a > b;
}

int rek(int u, int p = -1){
	int ret = 0;
	vll tmp; tmp.clear();
	s[u] = (ll)val[u];
	
	for(auto x: g[u]) if(x != p){
		ret += rek(x, u);
		s[u] += (ll)s[x];
		tmp.PB(s[x]);
	}
	
	if(s[u] <= k) return ret;
	
	sort(all(tmp), cmp);
	
	for(int i=0; i<tmp.size(); i++){
		ret++, s[u] -= tmp[i];
		if(s[u] <= k) return ret;
	}
}


void solve(){
	cin >> n >> k;
	for(int i=1; i<=n; i++) cin >> val[i];
	for(int i=1, a, b; i<n; i++) cin >> a >> b, g[a].PB(b), g[b].PB(a);
	cout << rek(1, -1) << "\n";
}


int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int t=1;
	//cin >> t;
	while(t--)solve();
	return 0;
}

Compilation message (stderr)

paprike.cpp: In function 'int rek(int, int)':
paprike.cpp:74:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |  for(int i=0; i<tmp.size(); i++){
      |               ~^~~~~~~~~~~
paprike.cpp:61:6: warning: control reaches end of non-void function [-Wreturn-type]
   61 |  vll tmp; tmp.clear();
      |      ^~~

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