Submission #71589

#	Time	Username	Problem	Language	Result	Execution time	Memory
71589		algorithm16	Paprike (COI18_paprike)	C++14	13 / 100	260 ms	99564 KiB

paprike

#include<iostream>
#include<vector>
using namespace std;
typedef long long int llint;
llint parent[3000000],brojac=0,b1=0;
vector <llint> c[3000000];
llint sum[3000000];
vector <llint> v;
llint n,k;
int dfs(int x) {
	llint mini=10000000,b2=0,b3=0,b4=0,b5=0;
	for(int i=0;i<c[x].size();i++) {
		if(parent[x]==c[x][i]) continue;
		//cout <<x<<" "<<c[x][i]<<endl;
		//sum2+=sum[c[x][i]];
		/*if(mini==-1) mini=dfs(c[x][i],brojac2,x);
		else if(dfs(c[x][i],brojac2,x)<mini) mini=dfs(c[x][i],brojac2,x);*/
		//cout <<x<<" "<<dfs(c[x][i],0)<<endl;
		int sum2=dfs(c[x][i]);
		if(sum2+v[x]>k) {
			b2+=1;
			//b1+=sum2;
			//sum[x]-=b1;
			//cout <<v[x]<<" "<<sum2<<" "<<"uvjet1"<<endl;
			brojac+=1;
			sum[x]-=sum2;
		}
		else {
			b4+=sum2;
			b3+=sum2;
			b5+=1;
			if(sum2<mini) mini=sum2;
		}
	}
	b4-=mini;
	int s=c[x].size();
	if(s-b2-1>1) {
		//cout <<v[x]<<" "<<s-b2-1<<" "<<"uvjet2"<<endl;
		b3-=b4;
		//b1+=maxi;
		brojac+=b5-1;
	}
	else if(x==0 && s-b2>1) {
		//cout <<v[x]<<" "<<s-b2-1<<" "<<"uvjet2"<<endl;
		b3-=b4;
		//b1+=maxi;
		brojac+=1;
	}
	//if(x==0) cout <<b3<<" "<<maxi<<endl;
	sum[x]=v[x]+b3;
	//sum[x]-=b1;
	return sum[x];
}
void dfs2(int x,int par) {
	parent[x]=par;
	for(int i=0;i<c[x].size();i++) {
		if(c[x][i]==par) continue;
		dfs2(c[x][i],x);
		sum[x]+=sum[c[x][i]];
	}
	sum[x]+=v[x];
}
int main()
{
	cin >> n >> k;
	vector <pair<llint,llint> > y;
	for(int i=0;i<n;i++) {
		int x;
		cin >> x;
		v.push_back(x);
	}
	for(int i=0;i<n-1;i++) {
		int a,b;
		cin >> a >> b;
		y.push_back(make_pair(a-1,b-1));
		c[a-1].push_back(b-1);
		c[b-1].push_back(a-1);
	}
	dfs2(0,-1);
	dfs(0);
	/*for(int i=0;i<n;i++) {
		cout <<sum[i]<<" ";
	}
	cout <<endl;*/
	cout <<brojac;
	return 0;
}

Compilation message (stderr)

paprike.cpp: In function 'int dfs(int)':
paprike.cpp:12:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<c[x].size();i++) {
              ~^~~~~~~~~~~~
paprike.cpp: In function 'void dfs2(int, int)':
paprike.cpp:56:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<c[x].size();i++) {
              ~^~~~~~~~~~~~

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