Submission #486332

#	Time	Username	Problem	Language	Result	Execution time	Memory
486332		Koosha_mv	Cat in a tree (BOI17_catinatree)	C++14	100 / 100	205 ms	21188 KiB

catinatree

#include <bits/stdc++.h>
using namespace std;
#define erorp(x) cout<<#x<<"={"<<(x.F)<<" , "<<x.S<<"}"<<endl
#define print(v,r) f(i,0,r) cout<<v[i]<<" "; cout<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define Add(x,y) x=(x+y)%mod
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first

const int N=2e5+99;

int n,t,d,ans,a[N],h[N],mark[N],dist[N];
vector<int> v,g[N];

bool cmp(int i,int j){
	return h[i]>h[j];
}
void dfs1(int x,int par){
	v.pb(x);
	f(i,0,g[x].size()){
		if(g[x][i]!=par){
			h[g[x][i]]=h[x]+1;
			dfs1(g[x][i],x);
		}
	}
}
void dfs2(int x,int par,int d){
	if(dist[x]<=d) return ;
	dist[x]=d;
	f(i,0,g[x].size()){
		if(g[x][i]!=par){
			dfs2(g[x][i],x,d+1);
		}
	} 
}

int main(){
	cin>>n>>d;
	f(i,1,n){
		int x;
		cin>>x;
		g[i].pb(x);
		g[x].pb(i);
	}
	dfs1(1,n);
	fill(dist,dist+N,d);
	sort(v.begin(),v.end(),cmp);
	f(i,0,v.size()){
		int u=v[i];
		if(dist[u]==d){
			ans++;
			dfs2(u,n,0);
		}
	}
	cout<<ans;
}

Compilation message (stderr)

catinatree.cpp: In function 'void dfs1(int, int)':
catinatree.cpp:7:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 | #define f(i,a,b) for(int i=a;i<b;i++)
......
   30 |  f(i,0,g[x].size()){
      |    ~~~~~~~~~~~~~~~             
catinatree.cpp:30:2: note: in expansion of macro 'f'
   30 |  f(i,0,g[x].size()){
      |  ^
catinatree.cpp: In function 'void dfs2(int, int, int)':
catinatree.cpp:7:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 | #define f(i,a,b) for(int i=a;i<b;i++)
......
   40 |  f(i,0,g[x].size()){
      |    ~~~~~~~~~~~~~~~             
catinatree.cpp:40:2: note: in expansion of macro 'f'
   40 |  f(i,0,g[x].size()){
      |  ^
catinatree.cpp: In function 'int main()':
catinatree.cpp:7:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 | #define f(i,a,b) for(int i=a;i<b;i++)
......
   58 |  f(i,0,v.size()){
      |    ~~~~~~~~~~~~                
catinatree.cpp:58:2: note: in expansion of macro 'f'
   58 |  f(i,0,v.size()){
      |  ^

• Subtask 1: 11 / 11
• Subtask 2: 40 / 40
• Subtask 3: 49 / 49