Submission #990673

#	Time	Username	Problem	Language	Result	Execution time	Memory
990673		starchan	Fish 3 (JOI24_fish3)	C++17	100 / 100	551 ms	111956 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define in array<int, 2>
#define pb push_back
#define pob pop_back
#define INF (int)1e17
#define fast() ios_base::sync_with_stdio(false); cin.tie(NULL)

const int LOGM = 19;
const int MX = 3e5+5;

signed main()
{
	fast();
	int n, d;
	cin >> n >> d;
	vector<int> c(n+1); vector<int> off(n+1, 0);
	for(int i = 1; i <= n; i++)
		cin >> c[i];
	
	vector<int> a(n+1), pref(n+1, 0); pref[1] = a[1] = c[1]/d;
	for(int i = 2; i <= n; i++)
	{
		off[i] = off[i-1] + ((c[i]%d) < (c[i-1]%d));
		a[i] = (c[i]/d) - off[i];
		pref[i] = a[i] + pref[i-1];
	}
	//immediate left that is smaller.

	int L[LOGM][n+1]; L[0][0] = 0; a[0] = -INF; int S[LOGM][n+1]; S[0][0] = 0;

	for(int i = 1; i <= n; i++)
	{
		L[0][i] = i-1;
		while(a[L[0][i]] >= a[i])
			L[0][i] = L[0][L[0][i]];
		S[0][i] = a[i]*(i-L[0][i]);
	}

	for(int i = 1; i < LOGM; i++)
	{
		for(int j = 0; j <= n; j++)
		{
			L[i][j] = L[i-1][L[i-1][j]];
			S[i][j] = S[i-1][j]+S[i-1][L[i-1][j]];
		}
	}

	int q; cin >> q;
	while(q--)
	{
		int l, r;
		cin >> l >> r;
		int SS = pref[r]-pref[l-1]; 
		for(int i = LOGM-1; i >= 0; i--)
		{
			if(L[i][r] >= l)
			{
				SS-=S[i][r];
				r = L[i][r];
			}
		}
		SS-=(a[r]*(r-l+1));
		if(a[r] < (-off[l]))
			SS = -1;
		cout << SS << "\n";
	}
	return 0;
}	

• Subtask 1: 9 / 9
• Subtask 2: 7 / 7
• Subtask 3: 28 / 28
• Subtask 4: 20 / 20
• Subtask 5: 36 / 36