Submission #167470

#	Time	Username	Problem	Language	Result	Execution time	Memory
167470		Thuleanx	Lightning Conductor (POI11_pio)	C++14	91 / 100	150 ms	25180 KiB

pio

#include <bits/stdc++.h>
using namespace std;

const int N = 5e5+7;
int n;
int h[N];
int L[N], R[N];
double sqr[N];

struct Sol {
	int i, high;
	Sol(int i, int high):i(i), high(high) {}
	int value(int j) { return high + ceil(sqr[j-i]); }
	double actual_value(int j) { return high + sqr[j-i]; }
	int to(Sol &other) {
		int lo = other.i, hi = n-1;
		while (lo <= hi) {
			int mid = lo+hi>>1;	
			if (actual_value(mid) > other.actual_value(mid)) 	lo = mid+1;
			else												hi = mid-1;
		}
		return lo;
	}
};

void solve(int A[]) {
	deque<Sol> dq;
	int hi = -1;
	for (int i = 0; i < n; i++) {
		while (dq.size() >= 2 && dq[0].value(i) < dq[1].value(i))
			dq.pop_front();
		if (dq.size())
			A[i] = dq.front().value(i);
		if (hi < h[i]) {
			Sol sol(i, h[i]);
			while (dq.size() && dq.back().to(sol) <= i)
				dq.pop_back();
			while (dq.size() >= 2 && dq[dq.size()-2].to(dq.back()) >= dq.back().to(sol))
				dq.pop_back();
			dq.push_back(sol);
		}
		hi = max(hi, h[i]);
	}
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	cin>>n;
	memset(sqr,0,sizeof(sqr));
	for (int i = 0; i < N; i++)
		sqr[i] = sqrt(i);
	for (int i = 0; i < n; i++)
		cin>>h[i];

	solve(L);
	reverse(h, h+n);
	solve(R);
	reverse(h, h+n);
	reverse(R, R+n);

	stringstream ss;
	for (int i = 0; i < n; i++) 
		ss << max(0, max(L[i],R[i])-h[i]) << endl;
	cout << ss.str();

	return 0;
}

Compilation message (stderr)

pio.cpp: In member function 'int Sol::to(Sol&)':
pio.cpp:18:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    int mid = lo+hi>>1; 
              ~~^~~

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 9 / 9
• Subtask 7: 0 / 9
• Subtask 8: 9 / 9
• Subtask 9: 9 / 9
• Subtask 10: 9 / 9
• Subtask 11: 10 / 10