Submission #388562

#	Time	Username	Problem	Language	Result	Execution time	Memory
388562		Keshi	Shortcut (IOI16_shortcut)	C++17	0 / 100	11 ms	19148 KiB

shortcut

//In the name of God
#include <bits/stdc++.h>
#include "shortcut.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 (lc | 1)

struct node{
	ll mxr, mxl, mx;
	node(){
		mxr = mxl = mx = 0;
	}
};

ll n, ps[maxn], d[maxn];
node seg[maxn << 2];

node mrg(node l, node r){
	node nd;
	nd.mx = max({l.mx, r.mx, l.mxl + r.mxr});
	nd.mxl = max(l.mxl, r.mxl);
	nd.mxr = max(l.mxr, r.mxr);
	return nd;
}

void bld(ll id, ll s, ll e){
	if(e - s == 1){
		seg[id].mx = d[s];
		seg[id].mxl = d[s] - ps[s];
		seg[id].mxr = d[s] + ps[s];
		return;
	}
	ll mid = (s + e) >> 1;
	bld(lc, s, mid);
	bld(rc, mid, e);
	seg[id] = mrg(seg[lc], seg[rc]);
	return;
}
node get(ll id, ll s, ll e, ll l, ll r){
	if(r <= s || e <= l) return node();
	if(l <= s && e <= r) return seg[id];
	ll mid = (s + e) >> 1;
	return mrg(get(lc, s, mid, l, r), get(rc, mid, e, l, r));
}
node get(ll l, ll r){
	return get(1, 0, n, l, r);
}

long long find_shortcut(int N, vector<int> l, vector<int> D, int c){
	n = N;
	for(ll i = 0; i < n; i++){
		d[i] = D[i];
		ps[i + 1] = ps[i] + l[i];
	}
	bld(1, 0, n);
	ll ans = get(0, n).mx;
	for(ll i = 0; i < n; i++){
		for(ll j = i + 1; j < n; j++){
			ll x = get(0, i + 1).mxl + get(j, n).mxr - max(0ll, (ps[j] - ps[i]) - c);
			x = max(x, get(0, j).mx);
			x = max(x, get(i + 1, n).mx);
			ans = min(ans, x);
		}
	}
	return ans;
}

/*int main(){
    fast_io;



    return 0;
}*/

• Subtask 1: 0 / 9
• Subtask 2: 0 / 14
• Subtask 3: 0 / 8
• Subtask 4: 0 / 7
• Subtask 5: 0 / 33
• Subtask 6: 0 / 22
• Subtask 7: 0 / 4
• Subtask 8: 0 / 3