Submission #1364111

#TimeUsernameProblemLanguageResultExecution timeMemory
1364111digitaldreamerStranded Far From Home (BOI22_island)C++20
0 / 100
16 ms42700 KiB
#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define mid (l + ((r - l) / 2))
#define F first
#define S second

int64_t n, m ;
vector<int64_t> a(2e5 + 5), lg(2e5 + 5 , -1), pr(2e5 + 5) ;
vector<vector<int64_t>> adj(2e5 + 5) ;
vector<vector<int64_t>> sp(20 , vector<int64_t>(2e5 + 5)) ;
vector<bool> an(2e5 + 5) ;

void rec(int64_t par , int64_t l , int64_t r)
{
	cout << " ==> " << par << ' ' << l << ' ' << r << endl;
	cout << lg[r - l + 1] << ' ' << r - (1 << lg[r - l + 1]) + 1 << endl;
	if(l == r)
	{
		if(a[l] >= a[par]) an[l] = 1 ;
		return ;
	}
	int64_t x = sp[lg[r - l + 1]][l] ;
	int64_t y = sp[lg[r - l + 1]][r - (1 << lg[r - l + 1]) + 1] ;
	int64_t p = (a[x] >= a[y] ? x : y) ;
	cout << x << " : " << y << " : " << p << endl;
	an[p] = 1 ;
	if(pr[p - 1] - pr[l - 1] >= a[p]) rec(p , l , p - 1) ;
	if(pr[r] - pr[p] >= a[p]) rec(p , p + 1 , r) ;
	return ;
}

void solve()
{
    cin >> n >> m ;
    for(int64_t i = 1 ; i <= n ; i++) cin >> a[i] ;
    for(int64_t i = 1 ; i <= m ; i++)
    {
		int64_t x, y ;
		cin >> x >> y ;
		adj[x].pb(y), adj[y].pb(x) ;
	}
	
	for(int64_t i = 0 ; i < 20 ; i++)
	{
		for(int64_t j = 1 ; j <= n ; j++) 
		{
			if(i == 0) sp[i][j] = j ;
			else 
			{
				int64_t x = sp[i - 1][j], y = sp[i - 1][j + (1 << (i - 1))] ;
				sp[i][j] = (a[x] >= a[y] ? x : y) ;
			}
		}
	}
	
	for(int64_t i = 1 ; i <= n ; i++) lg[i] = lg[i / 2] + 1, pr[i] = pr[i - 1] + a[i] ;
	rec(0 , 1 , n) ;
	for(int64_t i = 1 ; i <= n ; i++) cout << an[i] ;
	cout << endl;
}


int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int tt = 1 ;
    //cin >> tt;
    while (tt--) solve() ;
}
#Result Execution timeMemoryGrader output
Fetching results...
#Result Execution timeMemoryGrader output
Fetching results...
#Result Execution timeMemoryGrader output
Fetching results...
#Result Execution timeMemoryGrader output
Fetching results...
#Result Execution timeMemoryGrader output
Fetching results...