제출 #1200913

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1200913		PlayVoltz	Horses (IOI15_horses)	C++20	100 / 100	327 ms	103172 KiB

horses

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

#define int long long
#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second

const int MOD = 1e9+7;

int n, t=1;
vector<int> x;
multiset<pii> s;

struct node{
	int s, e, m, val;
	node *l, *r;
	
	node(int S, int E){
		s = S, e = E, m = (s+e)/2;
		val=0;
		if (s!=e){
			l = new node(s, m);
			r = new node(m+1, e);
		}
	}
	void up(int ind, int nv){
		if (s==e)val=nv;
		else{
			if (ind<=m)l->up(ind, nv);
			else r->up(ind, nv);
			val = max(l->val, r->val);
		}
	}
	int query(int left, int right){
		if (s==left && e==right)return val;
		if (right<=m)return l->query(left, right);
		else if (left>m)return r->query(left, right);
		else return max(l->query(left, m), r->query(m+1, right));
	}
}*st;

int inv(int num){
	int p=MOD, res=1, y=0;
	while (num>1){
		int q=num/p, t=p;
		p=num%p, num=t, t=y, y=res-q*y, res=t;
	}
	if (res<0)res+=MOD;
	return res;
}

int query(){
	int res=1, c=t;
	for (auto a:s){
		int i=-a.fi, v=a.se;
		res=max(res, st->query(i, n-1));
		res*=v;
		c=(c*inv(v))%MOD;
		if (res>1e9)break;
	}
	res%=MOD;
	return (c*res)%MOD;
}


signed init(signed N, signed X[], signed y[]){
	n=N;
	x.resize(n);
	st = new node(0, n-1);
	for (int i=0; i<n; ++i){
		x[i]=X[i];
		if (x[i]>1)s.insert(mp(-i, x[i]));
		t=(t*x[i])%MOD;
		st->up(i, y[i]);
	}
	s.insert(mp(0, 1));
	return query();
}

signed updateX(signed pos, signed val){
	if (x[pos]>1)s.erase(s.find(mp(-pos, x[pos])));
	t=(((t*inv(x[pos]))%MOD)*val)%MOD;
	x[pos]=val;
	if (val>1)s.insert(mp(-pos, x[pos]));
	return query();
}

signed updateY(signed pos, signed val) {
	st->up(pos, val);
	return query();
}

• Subtask 1: 17 / 17
• Subtask 2: 17 / 17
• Subtask 3: 20 / 20
• Subtask 4: 23 / 23
• Subtask 5: 23 / 23