Submission #588367

#	Time	Username	Problem	Language	Result	Execution time	Memory
588367		dozer	Fountain (eJOI20_fountain)	C++14	0 / 100	290 ms	32512 KiB

fountain

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sp " "
#define endl "\n"
#define fileio() freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#define fastio() cin.tie(0), ios_base::sync_with_stdio(0)
#define N 400005
#define pii pair<int, int>
#define st first
#define nd second
#define modulo 1000000007
#define LOGN 18
#define int long long

int nxt[LOGN][N], arr[N], c[N], sum[LOGN][N]; 

int32_t main()
{
	fastio();

	int n, q;
	cin>>n>>q;
	for (int i = 1; i <= n; i++)
		cin>>arr[i]>>c[i];
	arr[0] = modulo;
	nxt[0][n] = 0;
	for (int i = n - 1; i >= 1; i--)
	{
		nxt[0][i] = i + 1;
		while(arr[nxt[0][i]] <= arr[i]) nxt[0][i] = nxt[0][nxt[0][i]];
		sum[0][i] = c[nxt[0][i]];
	}
	for (int i = 1; i < LOGN; i++)
	{
		for (int j = 1; j <= n; j++)
		{
			sum[i][j] = sum[i - 1][j] + sum[i - 1][j + (1<<(i - 1))];
			nxt[i][j] = nxt[i - 1][nxt[i - 1][j]];
		}
	}

	while(q--)
	{
		int r, v;
		cin>>r>>v;
		if (v <= c[r])
		{
			cout<<r<<endl;
			continue;
		}
		v -= c[r];
		int curr = r;
		
		for (int i = LOGN - 1; i >= 0; i--)
		{
			int tmp = nxt[i][curr];
			if (sum[i][curr] <= v)
			{
				v -= sum[i][curr];
				curr = tmp;
			}
		}
		
		cout<<nxt[0][curr]<<endl;
	}
	

	cerr<<"time taken : "<<(float)clock() / CLOCKS_PER_SEC<<" seconds\n";
}

• Subtask 1: 0 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40