oj.uz

Submission #247104

# Submission time Handle Problem Language Result Execution time Memory
247104 2020-07-11T06:01:35 Z errorgorn Lokahian Relics (FXCUP4_lokahia) C++17
0 / 100
 6 ms 640 KB 
#include <bits/stdc++.h>
#include "lokahia.h"
using namespace std;
 
#define ll long long
#define fi first
#define se second 

#define rep(x,s,e) for (auto x=s-(s>e);x!=e-(s>e);(s<e?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()
mt19937 rng (chrono::system_clock::now().time_since_epoch().count());

const int trial=30; //test 30 different startings
const int samples=12; //test 10 different random places

vector<int> shuf(vector<int> v){
	rep(x,0,sz(v)){
		swap(v[x],v[rng()%(x+1)]);
	}
	
	return v;
}

int FindBase(int n){
	if (n==1) return 1;
	
	int best=-1;
	int root;
	
	vector<int> v;
	rep(x,0,n) v.push_back(x);
	
	shuf(v);
	
	rep(x,0,min(trial,sz(v))){
		int node=v[x];
		int curr=0;
		rep(zzz,0,samples){
			int temp;
			
			do{
				temp=rng()%n;
			} while (temp==node);
			
			//cout<<"debug: "<<node<<" "<<temp<<endl;
			if (CollectRelics(node,temp)!=-1) curr++;
			
		}
		
		if (curr>best){
			best=curr;
			root=node;
		}
	}
	
	int ans=-1;
	int cnt=1;
	
	rep(x,0,n) if (x!=root){
		int temp=CollectRelics(root,x);
		
		if (temp!=-1) cnt++,ans=max(ans,temp);
	}
	
	//cout<<ans<<" "<<cnt<<endl;
	
	if (cnt>n/2) return ans;
	else return -1;
}

Compilation message

lokahia.cpp: In function 'int FindBase(int)':
lokahia.cpp:60:13: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
  rep(x,0,n) if (x!=root){
             ^~

Subtask #1
0 / 100.0

# Verdict Execution time Memory Grader output
1 Partially correct 5 ms 640 KB Partially correct : C = 558
2 Incorrect 5 ms 512 KB Wrong
3 Partially correct 6 ms 640 KB Partially correct : C = 559
4 Partially correct 5 ms 640 KB Partially correct : C = 559
5 Partially correct 5 ms 640 KB Partially correct : C = 559
6 Incorrect 5 ms 640 KB Wrong
7 Correct 5 ms 512 KB Correct : C = 64
8 Partially correct 5 ms 640 KB Partially correct : C = 558
9 Partially correct 5 ms 640 KB Partially correct : C = 478
10 Incorrect 5 ms 640 KB Wrong
11 Partially correct 5 ms 640 KB Partially correct : C = 559
12 Partially correct 6 ms 640 KB Partially correct : C = 558
13 Partially correct 5 ms 640 KB Partially correct : C = 558
14 Partially correct 5 ms 512 KB Partially correct : C = 478
15 Partially correct 5 ms 512 KB Partially correct : C = 478
16 Partially correct 5 ms 512 KB Partially correct : C = 479
17 Partially correct 5 ms 640 KB Partially correct : C = 559
18 Partially correct 5 ms 512 KB Partially correct : C = 479
19 Partially correct 5 ms 640 KB Partially correct : C = 478
20 Partially correct 5 ms 512 KB Partially correct : C = 479
21 Partially correct 5 ms 640 KB Partially correct : C = 558
22 Partially correct 5 ms 512 KB Partially correct : C = 479
23 Partially correct 5 ms 512 KB Partially correct : C = 479
24 Partially correct 5 ms 640 KB Partially correct : C = 558
25 Partially correct 5 ms 640 KB Partially correct : C = 559
26 Partially correct 5 ms 512 KB Partially correct : C = 478
27 Partially correct 5 ms 640 KB Partially correct : C = 559