Submission #12621030

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Source Code Expand

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

const int N=2e5+20;

int n,a[N],u,v,ans[N];
vector <int> adj[N];
multiset <int> s;

void dfs(int node,int parent=0)
{
	s.insert(a[node]);
	int del=-1;
	auto it=s.lower_bound(a[node]);
	if(++it!=s.end()) del=*it,s.erase(it);
	ans[node]=s.size();
	
	for(auto child:adj[node])
		if(child!=parent) dfs(child,node);
	
	if(del!=-1) s.insert(del);
	s.erase(s.find(a[node]));
}

int main()
{
	scanf("%d",&n);
	for(int i=1;i<=n;i++) scanf("%d",&a[i]);
	for(int i=0;i<n-1;i++)
	{
		scanf("%d%d",&u,&v);
		adj[u].push_back(v);
		adj[v].push_back(u);
	}

	dfs(1);
	for(int i=1;i<=n;i++) printf("%d\n",ans[i]);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:27:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   27 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
./Main.cpp:28:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   28 |  for(int i=1;i<=n;i++) scanf("%d",&a[i]);
      |                        ~~~~~^~~~~~~~~~~~
./Main.cpp:31:8: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   31 |   scanf("%d%d",&u,&v);
      |   ~~~~~^~~~~~~~~~~~~~

Judge Result