Submission #155523

#	Time	Username	Problem	Language	Result	Execution time	Memory
155523		qkxwsm	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++14	0 / 100	928 ms	69560 KiB

sortbooks

#include <bits/stdc++.h>

using namespace std;

template<class T, class U>
void ckmin(T &a, U b)
{
	if (a > b) a = b;
}
template<class T, class U>
void ckmax(T &a, U b)
{
	if (a < b) a = b;
}

#define MP make_pair
#define PB push_back
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define FOR(i, a, b) for (auto i = (a); i < (b); i++)
#define FORD(i, a, b) for (auto i = (a) - 1; i >= (b); i--)
#define SZ(x) ((int) ((x).size()))
#define ALL(x) (x).begin(), (x).end()
#define MAXN 1000013

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpi;
typedef vector<pll> vpl;
typedef pair<pii, pii> ppp;

int N, Q;
int arr[MAXN];
int pos[MAXN];
vpi guys;
vector<ppp> quer;
vi upds[MAXN];
bitset<MAXN> ans;
int fen[MAXN];

void update(int idx, int v)
{
	for (int e = idx + 1; e <= N; e += e & (-e)) ckmax(fen[e], v);
}
int query(int idx)
{
	int res = 0;
	for (int e = idx + 1; e; e -= e & (-e)) ckmax(res, fen[e]);
	return res;
}

//max (a[i] + a[j]) such that a[i] > a[j]

int32_t main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin >> N >> Q;
	FOR(i, 0, N)
	{
		cin >> arr[i];
	}
	FOR(i, 0, Q)
	{
		int l, r, v; cin >> l >> r >> v; l--; r--;
		quer.PB({{l, r}, {v, i}});
	}
	guys.PB({1000000013, -1});
	FOR(i, 0, N)
	{
		while(guys.back().fi <= arr[i])
		{
			guys.pop_back();
		}
		pos[i] = guys.back().se;
		guys.PB({arr[i], i});
		upds[pos[i]].PB(i);
	}
	sort(ALL(quer));
	int iter = SZ(quer) - 1;
	FORD(i, N, 0)
	{
		for (int x : upds[i])
		{
			update(x, arr[i] + arr[x]);
		}
		while(iter > 0 && quer[iter].fi.fi == i)
		{
			int l = quer[iter].fi.fi, r = quer[iter].fi.se, v = quer[i].se.fi, qid = quer[i].se.se;
			ans[qid] = (query(r) > v);
			iter--;
		}
	}
	//find the first guy > x on left.
	//left, right, value, qid;
	FOR(i, 0, Q)
	{
		cout << (ans[i] ? 0 : 1) << '\n';
	}
}

Compilation message (stderr)

sortbooks.cpp: In function 'int32_t main()':
sortbooks.cpp:94:8: warning: unused variable 'l' [-Wunused-variable]
    int l = quer[iter].fi.fi, r = quer[iter].fi.se, v = quer[i].se.fi, qid = quer[i].se.se;
        ^

• Subtask 1: 0 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 30
• Subtask 6: 0 / 23