oj.uz

답안 #132220

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
132220 2019-07-18T13:48:10 Z MoNsTeR_CuBe Simurgh (IOI17_simurgh) C++17
0 / 100
 15 ms 380 KB 
#include <bits/stdc++.h>
#include "simurgh.h"
using namespace std;

int N;

set< int > B;

/*int count_common_roads(vector< int > ans){
	assert((int)ans.size() == N-1);
	
	int tot = 0;
	
	for(int i = 0; i < (int)ans.size(); i++){
		tot += B.count(ans[i]);
	}
	
	return tot;
}
*/
vector< int > U;

int getParents(int a){
	if(U[a] == a) return a;
	else return U[a] = getParents(U[a]);
}

void Union(int a, int b){
	U[getParents(a)] = getParents(b);
}

int makeBetter(vector< tuple<int, int, int> > &golden, vector< tuple<int, int, int> > &rem, int start, int n){
	
	/*cout << "GOLDEN ";
	for(tuple<int, int, int> tup : golden) cout << get<2>(tup) << ' ';
	cout << endl;
	
	cout << "REM ";
	for(tuple<int, int, int> tup : rem) cout << get<2>(tup) << ' ';
	cout << endl;*/
	
	for(int i = 0; i < n-1; i++){
		for(int j = 0; j < n;j++){
			U[j] = j;
		}
		vector< tuple<int, int, int> > tempo;
		
		vector< int > ans;
		
		for(int j = 0; j < n-1; j++){
			if(j == i) continue;
			assert(getParents(get<0>(golden[j])) != getParents(get<1>(golden[j])));
			
			Union(get<0>(golden[j]), get<1>(golden[j]));
			tempo.push_back(golden[j]);
			ans.push_back(get<2>(golden[j]));
		}
		//cout << "BEFORE ";
		
		/*for(tuple<int, int, int> tup : tempo) cout << get<2>(tup) << ' ';
		cout << endl;*/
		
		for(int j = 0; j < (int)rem.size(); j++){
			if(getParents(get<0>(rem[j])) == getParents(get<1>(rem[j]))) continue;
			ans.push_back(get<2>(rem[j]));
			//cout << "WORK " << get<2>(rem[j]) << endl;
			int x = count_common_roads(ans);
			/*for(int a : ans) cout << a << ' ';
			cout << endl;*/
			
			if(x >= start){
				
				golden = tempo;
				golden.push_back(rem[j]);
				
				swap(rem[j], rem.back());
				rem.pop_back();
				
				rem.push_back(golden[i]);
				
				return x;
			}
			ans.pop_back();
		}
	}
	return start;
}

vector<int> find_roads(int n, vector<int> u, vector<int> v) {
	U.resize(n);
	for(int i = 0; i < n; i++){
		U[i] = i;
	}
	
	vector< tuple<int, int, int> > golden;
	
	vector< tuple<int, int, int> > rem;
	
	for(int i = 0; i < (int)u.size(); i++){
		if(getParents(u[i]) == getParents(v[i])){
			rem.push_back(make_tuple(u[i], v[i], i));
			continue;
		} 
		
		golden.push_back(make_tuple(u[i], v[i], i));
		
		Union(u[i], v[i]);
	}
	
	vector< int > ans;
	
	for(int i = 0; i < n-1; i++){
		ans.push_back(get<2>(golden[i]));
	}
	
	int start = count_common_roads(ans);
	
	while(start < n-1){
		start = makeBetter(golden, rem, start,n);
	}
	
	//cout << start << endl;
	
	ans.clear();
	
	for(int i = 0; i < n-1; i++){
		ans.push_back(get<2>(golden[i]));
	}
	
	sort(ans.begin(), ans.end());
	
	return ans;
}
/*
int main(){
	cin >> N;
	
	int m;
	cin >> m;
	
	vector< int > u(m);
	vector< int > v(m);
	
	for(int i = 0; i < m; i++){
		int a, b;
		cin >> a >> b;
		
		u[i] = a;
		v[i] = b;
	}
	
	for(int i = 0; i < N-1; i++){
		int a;
		cin >> a;
		
		B.insert(a);
	}
	
	vector< int > REP = find_roads(N,u,v);
	for(int a : REP) cout << a << ' ';
	cout << endl;
}
*/

Subtask #1
0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 15 ms 380 KB WA in grader: NO
2 Halted 0 ms 0 KB -

Subtask #2
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 15 ms 380 KB WA in grader: NO
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 15 ms 380 KB WA in grader: NO
2 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB correct
2 Incorrect 9 ms 256 KB WA in grader: NO
3 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 15 ms 380 KB WA in grader: NO
2 Halted 0 ms 0 KB -