Submission #387895

#	Time	Username	Problem	Language	Result	Execution time	Memory
387895		Keshi	Holiday (IOI14_holiday)	C++17	100 / 100	1741 ms	9596 KiB

holiday

//In the name of God
#include <bits/stdc++.h>
#include"holiday.h"
using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

const ll maxn = 2e5 + 100;
const ll mod = 1e9 + 7;
const ll inf = 1e18;

#define fast_io ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define file_io freopen("input.txt", "r+", stdin);freopen("output.txt", "w+", stdout);
#define pb push_back
#define Mp make_pair
#define F first
#define S second
#define Sz(x) ll((x).size())
#define all(x) (x).begin(), (x).end()
#define lc (id << 1)
#define rc (id << 1 | 1)

int start, n, d;
ll a[maxn], at[maxn];
ll seg[maxn << 2], cnt[maxn << 2];
pll b[maxn];

void upd(ll id, ll s, ll e, ll i, ll x){
	if(i < s || e <= i) return;
	if(e - s == 1){
		cnt[id] += x;
		seg[id] += x * a[s];
		return;
	}
	ll mid = (s + e) >> 1;
	upd(lc, s, mid, i, x);
	upd(rc, mid, e, i, x);
	cnt[id] = cnt[lc] + cnt[rc];
	seg[id] = seg[lc] + seg[rc];
	return;
}
ll get(ll id, ll s, ll e, ll x){
	if(x <= 0) return 0;
	if(x >= cnt[id]) return seg[id];
	ll mid = (s + e) >> 1;
	return get(rc, mid, e, x) + get(lc, s, mid, x - cnt[rc]);
}

ll len(ll l, ll r){
	return r - l + (start - l);
}

ll is[maxn];

ll cal(ll l, ll r){
	return get(1, 0, n, d - len(l, r));
}

void add(ll i){
	is[i]++;
	upd(1, 0, n, at[i], 1);
}
void rem(ll i){
	is[i]--;
	upd(1, 0, n, at[i], -1);
}

ll solve(ll s, ll e, ll l, ll r){
	if(s >= e) return 0;
	// [s, l]
	ll mid = (s + e) >> 1;
	for(ll i = s; i < mid; i++){
		rem(i);
	}
	// [mid, l]
	ll ans = cal(mid, l);
	ll opt = l;
	for(ll i = l + 1; i < r; i++){
		add(i);
		ll cc = cal(mid, i);
		if(cc > ans){
			ans = cc;
			opt = i;
		}
	}
	// [mid, r - 1]
	rem(mid);
	// [mid + 1, r - 1]
	for(ll i = opt + 1; i < r; i++){
		rem(i);
	}
	// [mid + 1, opt]
	ans = max(ans, solve(mid + 1, e, opt, r));
	// [mid + 1, opt]
	for(ll i = s; i <= mid; i++){
		add(i);
	}
	// [s, opt]
	for(ll i = l + 1; i <= opt; i++){
		rem(i);
	}
	// [s, l]
	ans = max(ans, solve(s, mid, l, opt + 1));
	// [s, l]
	return ans;
}

long long int findMaxAttraction(int N, int Start, int D, int A[]){
	d = D;
	n = N;
	start = Start;
	for(ll i = 0; i < n; i++){
		b[i] = Mp(A[i], i);
	}
	sort(b, b + n);
	for(ll i = 0; i < n; i++){
		a[i] = b[i].F;
		at[b[i].S] = i;
	}
	for(ll i = 0; i <= start; i++){
		add(i);
	}
	ll ans = solve(0, start + 1, start, n);
	for(ll i = 0; i <= start; i++){
		rem(i);
	}
	reverse(at, at + n);
	start = n - start - 1;
	for(ll i = 0; i <= start; i++){
		add(i);
	}
	ans = max(ans, solve(0, start + 1, start, n));
	return ans;
}

/*int main(){
    fast_io;



    return 0;
}*/

• Subtask 1: 7 / 7
• Subtask 2: 23 / 23
• Subtask 3: 17 / 17
• Subtask 4: 53 / 53