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답안 #247105

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
247105 2020-07-11T06:02:46 Z errorgorn 로카히아 유적 (FXCUP4_lokahia) C++17
0 / 100
 5 ms 768 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=20; //test different startings
const int samples=12; //test 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

# 결과 실행 시간 메모리 Grader output
1 Partially correct 5 ms 512 KB Partially correct : C = 359
2 Partially correct 5 ms 640 KB Partially correct : C = 439
3 Partially correct 5 ms 512 KB Partially correct : C = 358
4 Partially correct 5 ms 640 KB Partially correct : C = 438
5 Partially correct 5 ms 640 KB Partially correct : C = 439
6 Partially correct 5 ms 640 KB Partially correct : C = 438
7 Partially correct 5 ms 512 KB Partially correct : C = 359
8 Partially correct 5 ms 640 KB Partially correct : C = 438
9 Correct 4 ms 512 KB Correct : C = 64
10 Partially correct 5 ms 640 KB Partially correct : C = 439
11 Incorrect 5 ms 640 KB Wrong
12 Partially correct 5 ms 512 KB Partially correct : C = 359
13 Partially correct 5 ms 640 KB Partially correct : C = 439
14 Partially correct 5 ms 512 KB Partially correct : C = 359
15 Partially correct 5 ms 640 KB Partially correct : C = 439
16 Partially correct 5 ms 640 KB Partially correct : C = 438
17 Partially correct 5 ms 640 KB Partially correct : C = 358
18 Partially correct 5 ms 512 KB Partially correct : C = 358
19 Partially correct 5 ms 512 KB Partially correct : C = 358
20 Partially correct 5 ms 640 KB Partially correct : C = 358
21 Partially correct 5 ms 640 KB Partially correct : C = 359
22 Partially correct 5 ms 640 KB Partially correct : C = 439
23 Partially correct 5 ms 640 KB Partially correct : C = 438
24 Incorrect 5 ms 512 KB Wrong
25 Partially correct 5 ms 640 KB Partially correct : C = 438
26 Partially correct 5 ms 640 KB Partially correct : C = 439
27 Partially correct 5 ms 768 KB Partially correct : C = 439