Submission #82712

#	Time	Username	Problem	Language	Result	Execution time	Memory
82712		farukkastamonuda	Triumphal arch (POI13_luk)	C++14	100 / 100	1090 ms	47068 KiB

luk

#include <bits/stdc++.h>
#define fi first
#define se second
#define lo long long 
#define inf 1000000009
#define md 1000000007
#define li 300005
#define mp make_pair
#define pb push_back
using namespace std;
int n,a,b,sz[li],sz2[li];
vector<int> v[li];
lo int dfs(int node,int ata,int val){
	lo int D=0;
	for(int i=0;i<(int)v[node].size();i++){
		int go=v[node][i];
		if(go==ata) continue;
		D+=dfs(go,node,val)+1;
	}
	return max(0LL,D-val);
}
bool ok(int val){
	return (dfs(1,-1,val)==0);
}
int main(){
	scanf("%d",&n);
	for(int i=1;i<n;i++){
		scanf("%d %d",&a,&b);
		v[a].pb(b);
		v[b].pb(a);
	}
	int bas=0,son=n-1;
	while(bas<=son){
		int mid=(bas+son)/2;
		if(ok(mid)) son=mid-1;
		else bas=mid+1;
	}
	printf("%d\n",bas);
	return 0;
}

Compilation message (stderr)

luk.cpp: In function 'int main()':
luk.cpp:26:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
luk.cpp:28:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&a,&b);
   ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10