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Submission #247103

# Submission time Handle Problem Language Result Execution time Memory
247103 2020-07-11T06:00:04 Z errorgorn Lokahian Relics (FXCUP4_lokahia) C++17
0 / 100
 1000 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=10; //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){
	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:58:13: 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 = 498
2 Partially correct 5 ms 640 KB Partially correct : C = 499
3 Partially correct 5 ms 640 KB Partially correct : C = 419
4 Partially correct 5 ms 640 KB Partially correct : C = 419
5 Partially correct 5 ms 640 KB Partially correct : C = 499
6 Correct 5 ms 512 KB Correct : C = 54
7 Partially correct 5 ms 640 KB Partially correct : C = 499
8 Partially correct 5 ms 640 KB Partially correct : C = 499
9 Partially correct 5 ms 640 KB Partially correct : C = 418
10 Partially correct 5 ms 640 KB Partially correct : C = 499
11 Partially correct 5 ms 640 KB Partially correct : C = 498
12 Partially correct 5 ms 640 KB Partially correct : C = 498
13 Partially correct 5 ms 640 KB Partially correct : C = 498
14 Partially correct 5 ms 640 KB Partially correct : C = 418
15 Partially correct 5 ms 640 KB Partially correct : C = 498
16 Partially correct 5 ms 640 KB Partially correct : C = 499
17 Partially correct 5 ms 640 KB Partially correct : C = 498
18 Incorrect 5 ms 512 KB Wrong
19 Partially correct 5 ms 640 KB Partially correct : C = 419
20 Partially correct 5 ms 640 KB Partially correct : C = 418
21 Partially correct 5 ms 640 KB Partially correct : C = 419
22 Partially correct 5 ms 640 KB Partially correct : C = 498
23 Partially correct 5 ms 640 KB Partially correct : C = 418
24 Execution timed out 1093 ms 512 KB Time limit exceeded
25 Partially correct 5 ms 640 KB Partially correct : C = 419
26 Partially correct 5 ms 640 KB Partially correct : C = 499
27 Partially correct 5 ms 640 KB Partially correct : C = 499